最新刊期
      卷 45 ， 期 7 ， 2022

        INVITED REVIEW

      • “在聚变能源领域，产氚包层技术是关键难题之一。国际热核聚变实验堆ITER将验证该技术，参与其实验包层项目是掌握该技术的唯一途径。项目成功实施将为未来聚变能发展奠定科学和工程基础。”
        SHENG Qian,WU Shuqin,WANG Xiaoyu,ZHAO Fengchao,LUO Xiaofang,QIAN Xiaoyong,LUO Delong
        Vol. 45, Issue 7, Article number: 070001(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070001
        摘要：The tritium breeding blanket (TBB) technology is one of the key technologies to be solved and also one of three major issues in the development of fusion reactor in the future. The international thermonuclear experimental reactor (ITER) will be the first nuclear fusion experimental reactor in the world whilst ITER test blanket module (TBM) program is the only way to test and validate the tritium breeding blanket technologies under a real fusion environment at present. The successful implementation of ITER TBM program will provide a solid scientific and engineering foundation for fusion energy development. This paper briefly introduces the content, necessity, strategy, organizing and implementation of ITER TBM program, and summarizes the development status and achievement of test blanket system (TBS) made by the participants of ITER members. Prospects of the TBS research activities for the next phase and subsequent research focuses are presented. It is expected to provide valuable references for tritium breeding blanket design and development of China fusion engineering test reactor (CFETR), as well as the development of the TBB technologies.  
        关键词：ITER;TBM program;Tritium breeding;Testing blanket module   
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        发布时间：2024-10-25

        SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS

      • “在同步辐射硬X射线纳米聚焦领域，专家设计了一种基于直圆型一维线性运动的平行连杆柔性铰链机构，实现了0.2毫米运动行程，位置稳定性达到±1.1纳米，为自主研发调节机构提供解决方案。”
        ZENG Chao,MAO Chengwen,HE Yan,LI Aiguo
        Vol. 45, Issue 7, Article number: 070101(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070101
        摘要：BackgroundThe focusing spot size of advanced synchrotron radiation hard X-ray nanoprobe can reach 10 nm level. For example, the Shanghai Synchrotron Radiation Facility Hard X-ray Nanoprobe Beamline has strict requirements for the accuracy, stability, travel range and load of the mechanism of focusing optical components with nano precision.PurposeThis study aims to design a circular parallel linkage flexure hinge displacement mechanism with one-dimensional linear motion and ultra-high stability according to the requirements of hard X-ray Kirkpatrick-Baez nano-focusing.MethodsFirstly, the analysis of the correspondence between the force input and the displacement output of the flexible hinge structure was carried out by the classical elastic theory. Then, the accuracy of the calculation was validated using finite element simulation, and the stability analysis of the flexible hinge mechanism under load conditions is carried out by finite element simulation. Finally, 3D-printed flexure hinge positioning mechanism prototype was tested for the verification of its motion range and accuracy.ResultsThe theoretical calculation is consistent with the finite element simulation with about 2% error. The motion range of tested prototype is 0.2 mm with positioning stability of ±1.1 nm (root mean square, RMS).ConclusionsThe designed flexible hinge mechanism of this study has an appropriate excellent dynamic performance, and high stability. It will help to develop high precision displacement mechanisms for synchrotron nano-focusing optical components in domestic.  
        关键词：X-ray nanoprobe;Precision positioning;Flexure hinge;Finite element analysis;3D printing   
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        发布时间：2024-10-25
      • “在衍射极限环领域，专家设计新型磁路提升四极磁铁磁场梯度，为环发展提供关键元件。”
        ZHU Ya,ZHANG Qinglei,ZHOU Qiaogen
        Vol. 45, Issue 7, Article number: 070102(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070102
        摘要：BackgroundHigh gradient quadrupole magnet has become a key element with the development of diffraction-limited storage ring for the fourth generation light source. The gradient of magnetic field of a quadrupole magnet depends on the inscribed radius, ampere-turns per pole and magnetic efficiency. However, the radius and ampere-turns per pole cannot be reduced or increased indefinitely. Improving magnetic efficiency has become an effective method to improve the gradient of magnetic field.PurposeThis study aims to design a novel magnetic circuit to improve magnetic efficiency and verify the effectiveness by simulation.MethodsPermanent magnets were installed on both sides of the poles face to improve the efficiency of saturated magnets, so as to improve the magnetic field gradient of the quadrupole magnet. A novel high gradient quadrupole magnet, targeted 100 T·m-1, was designed to verify the theory by simulation calculation using Poisson for 2D analysis and OPERA for 3D analysis. The effect to the magnetic field quality of the novel magnetic circuit was optimized to achieve good field region.ResultsSimulation results show the magnetic field gradient of designed novel high gradient quadrupole magnet reaches to 100 T·m-1 when the ampere-turns per pole is about 5400AT. The magnetic efficiency is about 91%. All of the multipole components of magnetic field meet the requirements.ConclusionsThe design of the new quadrupole magnet provides a feasible and effective solution for the design of high gradient quadrupole magnet in the future.  
        关键词：Quadrupole magnet;High gradient of magnetic field;Permanent magnet;Magnetic field quality   
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        发布时间：2024-10-25
      • “在材料科学等领域，上海光源BL14W1光束线站搭建了新型数据采集系统，实现了多样品XAFS的自动筛选及高信噪比自动采集，大幅提高了数据采集效率。”
        LIU Hongzhou,LI Ji,GU Songqi,SU Xiaozhi,MEI Bingbao,JIANG Zheng,LIU Zhi
        Vol. 45, Issue 7, Article number: 070103(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070103
        摘要：BackgroundX-ray absorption spectroscopy (XAS) has a wide range of applications in materials science, biology, chemistry and other fields.PurposeThis study aims to improve the efficiency of transmission acquisition of synchrotron X-ray absorption fine structure spectroscopy (XAFS) at the BL14W1 beamline station of Shanghai Synchrotron Radiation Facility (SSRF).MethodsA transmission XAFS data acquisition (DAQ) system based on distributed data acquisition nodes and XAFS test multi-sample racks was built. An integrated design and open the underlying system were applied to the distributed data acquisition nodes for direct acquisition of voltage signals and encoder signals with advantages of small size, low noise, low cost, and easy maintenance. Twelve sample holes were provided by the XAFS test multi-sample holder which could be remotely controlled to switch the hole positions. A new data acquisition system was built by combining the two hardware devices to provide functionalities such as automatic screening and spectrum collection of multiple samples. Both the new data acquisition system and the automatic screening spectrum acquisition program were written in LabVIEW.ResultsThe new data acquisition system realizes the high signal-to-noise ratio automatic screening and automatic acquisition of multi-sample XAFS, which greatly improves the efficiency of data acquisition.ConclusionsThe upgrade of the DAQ system for SSRF BL14W1 beamline greatly improve the spectrum collection efficiency, reduce the cost, reduce the maintenance difficulty, and reduce the occupied space for the operation of the line station.  
        关键词：Synchrotron radiation;Data acquisition;XAFS;LabVIEW   
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        发布时间：2024-10-25

        ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS

      • “在高功率中性束注入系统领域，专家针对强流离子源长脉冲稳定运行挑战，开展了基于打火再起的自调整技术研究，实现了兆瓦级离子束27秒长脉冲稳定运行，为高功率离子源长脉冲运行提供支持。”
        XIE Yahong,LIU Sheng,JIANG Caichao,PAN Junjun,XU Yongjian,ZHAO Yuanzhe,CUI Qinglong,XIE Yuanlai,HU Chundong
        Vol. 45, Issue 7, Article number: 070201(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070201
        摘要：BackgroundThe high power ion source is the one of the key components of a neutral beam injection system. Long pulse operation of ion source is required for fusion sciences research, but challenges come from the easy break down when operated with long pulse and high power. [Propose] This study aims to optimize the control and operation of ion source to achieve long pulse operation.MethodsBased on the beam re-turn on technology, an ion source self-adjusting method was developed. It included the optimization of ion source control logic, power supply system and interlock system. Operation characteristic of high power ion source was analyzed, and the key parameters of ion source operation was real-time monitored to find the abnormal conditions. The high current ion source was tested with beam re-turn on from one time only to several times for long pulse operation.Results & ConclusionsThe high power ion source is tested with beam re-turn on technology and achieves 27 s beam duration with one megawatts beam power successfully. The successful application of beam re-turn on technology in this study provides support for long pulse operation of high-power ion source.  
        关键词：Neutral beam injection;High current ion source;Beam self-adjusting;Hot cathode   
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        发布时间：2024-10-25

        NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE

      • “18F-FMM PET/CT脑显像可直观反映中老年人认知水平，对MCI和AD诊断具有应用价值。”
        LEI Zhe,WU Han,OU Yinghui,ZHAO Qianhua,SHAN Fengling,WANG Zi,ZHOU Meihong,ZHANG Qiongqiong,LIU Xueyuan,DING Jing,YIN You,WANG Xiuzhe,LOU Jingjing,LIU Xingdang
        Vol. 45, Issue 7, Article number: 070301(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070301
        摘要：Background18F-Flutemetamol (18F-FMM) PET/CT imaging has been widely applied to the diagnosis of mild cognitive impairment and Alzheimer's disease.PurposeThis study aims to explore the distributions of 18F-FMM in different brain regions of mild cognitive impairment (MCI) and Alzheimer's disease (AD) patients and the factors that may affect the combination of 18F-FMM, evaluating the use of 18F-FMM PET/CT imaging in the diagnosis of MCI and AD patients.MethodsFrom July 2020 to April 2021, 24 subjects with MCI (12 males, 12 females, aged of (70.54±9.27) years old), 25 subjects with AD (11 males, 14 females, aged (70.56±7.30) years old) and 9 subjects as normal controls (NC, 2 males, 7 females, aged (57.67±9.00) years old) were recruited from Shanghai. The 18F-FMM PET/CT brain imaging of all subjects were qualitatively and semi-quantitatively analyzed by visual evaluation and standardized uptake value ratio (SUVR), respectively. Student's t-test, one-way analysis of variance and rank sum test were used for the comparison of quantitative variables. Pearson's chi-squared test and Fisher's exact test were used for the comparison of qualitative variables. The diagnostic efficiency was obtained by ROC curve. Multiple linear regression analysis was used to analyze the factors that might affect the combination of 18F-FMM.ResultsThe positive rate of visual assessment was significantly different in NC, MCI and AD groups (χ2=26.85, p < 0.001), and significant differences existed statistically in SUVR of all brain regions among the three groups (H value: 11.54~19.34, F value: 7.43, 11.48, all p < 0.01). The mean values of SUVR in the whole brain of the three groups were statistically different (Z value: -3.87, -2.79, -2.45, all p < 0.016 7). Compared with MCI group, the positive rate in occipital lobe, temporal lobe, parietal lobe and posterior cingulate gyrus was statistically significant (χ2=7.53~10.89, all p < 0.01). With respect to NC, SUVR of all brain regions was lower than that in AD, while SUVR of temporal lobe, frontal lobe and precuneu were lower than that in MCI. Meanwhile, SUVR of occipital lobe, temporal lobe, frontal lobe and parietal lobe in MCI were lower than that in AD. Receiver operating characteristic (ROC) curves showed that the SUVR value of temporal lobe and the mean value of SUVR in the whole brain had the ability to distinguish NC, MCI and AD in sequence. Multiple linear regression analysis showed that cognitive level was significantly negatively correlated with 18F-FMM SUVR in different brain regions.Conclusion18F-FMM PET/CT brain imaging could reflect the cognitive level of middle-aged and elderly people intuitively and has clear diagnostic value for MCI and AD.  
        关键词：Alzheimer's disease;Mild cognitive impairment;Amyloid protein;Positron emission tomography   
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        发布时间：2024-10-25

        NUCLEAR ELECTRONICS AND INSTRUMENTATION

      • “在核工业领域，新型γ相机探测器展现出优异性能，为核电站大修和核退役设施源项定位提供重要应用价值。”
        LI Yan,WANG Chuan,LIU Liye,SHI Boxuan,CAO Qinjian,ZHAO Yuan,XIA Sanqiang,DONG Jiajie
        Vol. 45, Issue 7, Article number: 070401(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070401
        摘要：BackgroundThe detectors of traditional gamma-ray imaging systems cannot meet the radiation detection requirements of positioning for the nuclear industry application. LaBr3(Ce) crystal is a crystal with high light output, very short decay time of luminescence and large density. As a new type of photoelectric conversion device, SiPM has the advantages of small size, anti-magnetic field interference, low power supply voltage, and good time resolution compared with position sensitive photomultiplier tube (PSPMT).PurposeThis study aims to develop a position sensitive detector based on the LaBr3(Ce) crystal coupled with SiPM to achieve high energy resolution, high count rate and miniaturization.MethodsAn 8×8 LaBr3(Ce) crystal array with pixel size 6.4 mm×6.4 mm×20 mm per crystal bar was employed to couple 8×8 SiPM array with silicone grease to form the position sensitive. Then the corresponding readout circuit was designed according to the characteristics of the pulse signal. Finally, 137Cs point sources with different activities were used to test the performance of this detector system and conduct calibration.ResultsTest results show that the average energy resolution of the 64 crystal strips of the detector module is 4.96%, of which the best energy resolution is 3.92% and the worst is 5.91%. Subsequent testing and calibration of the peak position uniformity and sensitivity uniformity of each crystal strip pixel achieve good results.ConclusionsThe position sensitive detector based on the LaBr3(Ce) crystal coupled with SiPM can meet the design requirements of gamma camera imaging in the nuclear industry in terms of energy resolution, peak position uniformity and sensitivity uniformity.  
        关键词：LaBr3(Ce) crystal;Position sensitive detector;γ camera;Correction of sensitivity uniformity;Correction of peak position uniformity   
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        发布时间：2024-10-25
      • “纳米比亚湖山铀矿采用新型γ能谱测井仪，有效区分钍、铀、钾核素，实现铀含量定量测量，提高矿石铀品位测量准确性。”
        HAO Jinlong,DONG Wenming,CHEN Ning,DENG Hongze
        Vol. 45, Issue 7, Article number: 070402(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070402
        摘要：BackgroundThe main ore-bearing rock of the Husab Uranium Mine in Namibia, southern Africa, is white granite, and the radioactive element thorium content in the ore is high, which has a greater impact on the γ ray logging results.PurposeThis study aims to solve the problem of thorium's interference on the γ ray logging results by developing a γ ray spectrum logging instrument.MethodsA high-resolution LaBr3(Ce) scintillation detector was employed to build a new type of γ ray spectrum logging tool. Combined with cross-segment method of γ ray spectrum and techniques for separating the γ ray spectrum, the counting rates of thorium, uranium and potassium nuclides were greatly improved, so did the measuring range of the tool and logging speed. Experiment and calibration tests of this logging instrument were conducted on control holes, blast holes, national standard uranium calibration pit, etc., to verify its range, speed applicability, stability, repeatability, etc.ResultsTests results show that the γ ray spectrum logging achieves upper limit of uranium content measurement of 5.0% eU, and the logging speed of 0.067 m·s-1, satisfying the rapid quantitative measurement of uranium grades in the blast holes of the Husab Mine and accurately estimated the amount of uranium with superior measuring accuracy to the γ ray logging method.ConclusionsThe γ ray logging tool of this study reaches specification requirements of γ ray logging. It can effectively distinguish thorium, uranium and potassium nuclides, realizing the quantitative measurement of uranium content.  
        关键词：γ ray spectrum logging;LaBr3(Ce) scintillation crystals detector;Cross-segment method of γ ray spectrum;Techniques for separating the γ ray spectrum;Uranium content   
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        发布时间：2024-10-25
      • “在高计数率环境下，核脉冲信号冲激成形算法取得新进展。专家构建了数字冲激成形算法，推导出信号冲激响应数字递推解，为核脉冲信号冲激成形提供解决方案。”
        WANG Xueyuan,ZHOU Jianbin,HE Jianfeng,WANG Ming,TANG Bin,HONG Xu,LIU Yi
        Vol. 45, Issue 7, Article number: 070403(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070403
        摘要：BackgroundImpulse response shaping (IRS) of nuclear pulses is often used to obtain the quantity and time information of incident particles. It is widely used in nuclear radiation intensity measurement, high-resolution energy spectrum analysis, high counting-rate energy spectrum correction, and coincidence and anti-coincidence measurements.PurposeThe study aims to propose an IRS method for nuclear pulses obtained in high counting-rate environments.MethodsFirstly, the output signal model of the nuclear radiation detector systems was established from the principal of signal generating. Then, the digital recursive solution of the IRS algorithm was derived on the base of the derivative operation. Finally, based on the principle of RC integral shaping circuit, the method of obtaining time constants in the digital recursive solution was given. Simulated signals and acquired silicon drift detector (SDD) signals obtained from the analog-to-digital converter (ADC) were tested.ResultsExperimental results show that the proposed algorithm is superior to the traditional IRS algorithm based on Z-transform, and has better counting-rate characteristics in high counting-rate environments.ConclusionsThe new IRS algorithm is suitable for applications with different accuracy requirements and shaping speed requirements, especially suitable for impulse response shaping in high counting-rate environments.  
        关键词：Nuclear pulse signal;Impulse response shaping;Derivative operations;Z-transform   
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        发布时间：2024-10-25

        NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH

      • “在核电站中子屏蔽领域，B4C/Al基复合材料具有广泛应用前景。通过脉冲电流热处理，可提高材料的抗拉强度和延伸率，增强B4C颗粒的载荷传递作用。”
        GONG Pengfei,CHEN Hongsheng,WANG Wenxian,CHAI Fei,LIU Ruifeng,WANG Zhuoran,YANG Tao
        Vol. 45, Issue 7, Article number: 070501(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070501
        摘要：BackgroundBoron carbide (B4C) aluminum matrix composite has a wide application prospect in the field of nuclear power plant spent fuel storage shielding neutron due to the large neutron absorption cross section of B isotope 10B in B4C.PurposeThis study aims to investigate the response mechanism of current effect on the internal microstructure and mechanical properties of neutron absorbing materials.MethodsThe 30wt.% B4C/6061Al neutron absorbing material was prepared by multi-pass rolling after vacuum hot pressing. Electropulsing treatment (EPT) was applied to the heat treatment of prepared materials, and the skin effect and joule effect of current were made use of eliminating the defects and residual stresses at the particle/matrix interface. Finally, energy disperse spectroscopy (EDS), electron backscatter diffractometer (EBSD) and scanning electron microscope (SEM) were employed to observe the microstructure morphology and particle / matrix interface of the samples under different process parameters.ResultsThe results show that the EPT can promote the degree of recrystallization of the matrix alloy, healing heterogeneous particle/matrix interface of micro defects, improve the bonding strength of interface, inhibit grain growth of the matrix alloy, and reduce the interfacial residual stress. With the extension of time of applying pulse current, the tensile strength and elongation of the composite material showed a trend of increase, up to 245.2 MPa and 9.02%, the load transfer effect of B4C particles is enhanced, and the non-thermal effect of current play a leading role.ConclusionsEPT can improve the mechanical properties of B4C aluminum base neutron absorbing material.  
        关键词：B4C/6061Al composites;Neutron absorption;Electropulsing;Current effect   
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        NUCLEAR ENERGY SCIENCE AND ENGINEERING

      • “在聚变反应堆第一壁材料研究中，通过Ansys Workbench建模分析，发现引入Cu中间层可有效降低W/316L不锈钢系统热应力，缓解热失配现象。”
        LIU Ze,TANG Lin,ZHANG Yafei,YU Songke,MU Xueling,SUN Fuchun
        Vol. 45, Issue 7, Article number: 070601(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070601
        摘要：BackgroundDuring the service period of the first wall materials, the thermal stress in the material is one of the key issues restricingt the safety of the fusion reactor.PurposeThis study aims to clarify the influencing factors of thermal stress in the W/316L stainless steel taken as the first wall system of ITER (International Thermonuclear Experimental Reactor).MethodBased on the finite element software Ansys Workbench, the first wall system model of W/316L stainless steel was constructed. The relationship between temperature, coating thickness and substrate thickness and the thermal stress was analyzed. Finally, Cu interlayer was introduced to test the maximum thermal stress in the system.ResultsThe simulation results show that the thermal stress values increase with the increasing of temperature and substrate thickness. However, with the increase of coating thickness, an inverse relationship is found due to the stress relaxation. In addition, the stress mismatch caused by thermal mismatch between W and 316L stainless steel substrate is alleviated by adding Cu interlayer. The maximum thermal stress in the system is reduced from 1 676.3 MPa to 1 507.7 MPa.ConclusionsThis study lays a theoretical foundation for the development of high thermal stability W coating system.  
        关键词：W/316L;Stainless steel first wall system;Thermal stress;Temperature   
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      • “在第四代核能系统领域，研究人员开发了适用于熔盐冷却快堆多尺度热工流体耦合程序，为自然循环熔盐冷却堆的系统设计、优化和安全分析提供有效工具。”
        SONG Shiyang,CHENG Maosong,LIN Ming,DAI Zhimin
        Vol. 45, Issue 7, Article number: 070602(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070602
        摘要：BackgroundThe natural circulation chloride cooled fast reactor (N3CFR) has the characteristics of simple structure, high inherent safety and good economy. It is an advanced fourth-generation nuclear energy system with development potential. However, we are not able to calculate 3D thermal fluids in core when modeled using RELAP5-TMSR.PurposeThis study aims to improve the applicability and accuracy of the RELAP5-TMSR program in transient analysis and safety assessment of small natural circulation chloride cooled fast reactor (SN3CFR).MethodsFirstly, the coupling code was developed with an external explicit method, and verified by the horizontal tube model based on the system analysis code RELAP5-TMSR and the sub-channel code ThorSUBTH. Then, according to the natural circulation primary circuit main cooling system, a multiscale model of the SN3CFR was established to evaluate the applicability of the coupled code. Finally, the reactor steady-state operating parameters and the reactivity insertion incident conditions were calculated and analyzed.ResultsThe results show that the coupling code is in good agreement with the verification examples, and all key thermal parameters of SN3CFR meet design limits under reactive introduction accident conditions.ConclusionsThe development of a multiscale thermal hydraulics coupling code can perform system analysis fast and calculate the thermal fluid of the core more accurately, which is of great significance for the system design, safety analysis and optimization of molten salt cooled reactors.  
        关键词：Natural circulation chloride-cooled fast reactors;Multiscale;Coupling code;Subchannel;System program   
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      • “在核事故应急处置领域，专家基于AN-EOS模型，模拟了氚泄漏行为，验证了模型正确性，并分析了通风对氚气扩散的影响。”
        LI Changjun,CAI Xingfu,XIAO Mingqing,WANG Fei,CAO Xiaoyan
        Vol. 45, Issue 7, Article number: 070603(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070603
        摘要：BackgroundTritium leakage is a typical nuclear accident scene, which is harmful to human and environment. Therefore, numerical simulation of tritium leakage is of significance to nuclear accident emergency decision making.PurposeThis study aims at the numerical simulation of high-pressure tritium leakage.MethodsA numerical simulation method based on AN-EOS model was proposed to solve the problem of tritium leakage from high pressure storage vessels. The AN-EOS model embedded into Fluent by user defined functions was used to describe the tritium leakage transient behavior. The leakage process of tritium and variation rule of concentration were simulated in closed and ventilated environment based on Fluent.ResultsThe results show that the concentration of tritium increases rapidly when the leakage occurs. After stopping leakage, the concentration of tritium in a closed environment increases first and then stabilizes, and gradually decreases in ventilated environment.ConclusionsVentilation has a significant effect on the diffusion of tritium gas, which can effectively achieve the purpose of tritium removal.  
        关键词：Tritium leakage;AN-EOS;Transient behavior;Numerical simulation   
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      • “钍基熔盐堆缩比仿真装置研究取得新进展，分析了环形通道加热器的流动与传热特性，为提高能量利用率提供解决方案。”
        YANG Yang,ZOU Yang,CHEN Jingen,ZOU Chong
        Vol. 45, Issue 7, Article number: 070604(2022) DOI: 10.11889/j.0253-3219.2022.hjs.45.070604
        摘要：BackgroundThe simulation device is one-third scale of the 10 MW solid-fuel thorium molten-salt reactor (TMSR) and has the rated heat power of 370 kW. Nineteen annular channel heaters with wire coil were designed to heat the simulation device to the desired temperature.PurposeThis study aims to further investigate the effect of outer diameter of heating tube and annular width on the flow and heat transfer characteristics of FLiNaK salt in the annular channel heater.MethodsThe flow and heat transfer characteristics of annular channel heater with wire coil were simulated by using Fluent software. The effects of outer diameter of heating tube on the flow and temperature fields were investigated numerically, so did the effects of annular width on the flow and heat transfer characteristics. The overall performance of annular channel heater was evaluated by the principle of entropy production.ResultsThe simulation results show that the axial velocity, radial velocity and tangential velocity are generated and meanwhile counter-flow is formed on longitudinal section.ConclusionsThe outer diameter of heating tube has no effect on the flow and heat transfer characteristics. The larger the outer diameter of heating tube, the higher the energy efficiency. As the increase of the annular width, the pressure loss, the heat transfer coefficient decreases, and the energy efficiency gradually decreases.  
        关键词：Wire coil;Annular channel heater;FLiNaK salt;Flow and heat transfer characteristics;Energy efficiency   
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        发布时间：2024-10-25
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