CFETR VVPSS中爆破片优化设计与疲劳分析北大核心CSCD

为了应对泄漏事故下真空室内的过压情况,防止腔室内相关组件的过压损害,设计了真空室超压保护系统(VVPSS)。VVPSS是利用泄放装置(爆破片组件和泄压阀组件)泄放过压气体。考虑CFETR真空室内部布置的大量冷却管路,一旦发生严重的泄漏事故需要采用大直径爆破片在短时间内泄放大量过压气体。而国内的生产商无生产大尺寸爆破片的经验,所以大尺寸爆破片的研究工作迫切需要进行。本文简要描述了真空室超压保护系统的总体工程设计;为了方便快速拆装,满足遥操作的要求,开展了爆破片组件设计;利用有限元分析方法(FEM)研究了爆破片的厚度、圆角半径和缝宽对其爆破性能的影响,获得了符合设计要求的爆破片尺寸;同时针对使用寿命要求,对爆破片进行疲劳分析研究,获得目前爆破片结构使用寿命,分析结果满足设计要求。     

水工黏土基胶凝材料力学性能试验

为研制水工用黏土基胶凝材料,以航道护岸黏性弃土为主要原料,以试件抗压强度、劈裂抗拉强度及水稳定性作为控制指标,进行了水泥、石膏、矿粉等无机结合料掺量对黏土基胶凝材料力学性能影响的试验研究,并采用扫描电子显微镜分析试件的微观结构。结果表明:在黏性弃土、水泥、矿粉、石膏及石灰掺量分别为65%、18%、10%、2%和5%时,可获得28 d抗压强度达25.6 MPa、浸水强度达24.1 MPa、劈裂抗拉强度达2.5 MPa的黏土基胶凝材料;在不同的水化龄期,黏土基胶凝材料均生成了C-S-H凝胶等水泥基胶凝物质,这些产物相互交织、紧密结合,有效提高了材料的力学性能;该黏土基胶凝材料强度高、水稳定性好,可满足水运工程应用要求。     

HT-7U超导托卡马克装置真空室热烘烤结构数值模拟与分析

在等离子体运行前．为了提高真空室的本体真空度,获得一个高真空等离子体运行环境,必须对真空室进行250℃壁处理烘烤．除去吸附在器壁表面上的杂质。基于此,本文提出了电阻丝和气流加热两种烘烤方案,并对其结构进行了数值模拟和分析．得出了真空室烘烤时的加热功率、温度分布和热应力情况,为HT-7U和同类超导托卡马克装置真空室烘烤结构的工程设计和优化提供了理论参数依据。     

CFETR氦冷陶瓷增殖包层中子学分析

为满足中国聚变工程实验堆(CFETR)包层的应用要求,本文提出氦冷陶瓷增殖(HCCB)包层方案。为验证HCCB包层设计方案的合理性与可行性,采用三维蒙特卡罗粒子输运程序MCNP,计算和分析了HCCB包层方案的氚增殖比、中子壁负载、中子通量密度、核热、辐照损伤等中子学特性。结果表明,HCCB包层方案满足氚自持要求,中子通量密度和核热分布合理,屏蔽性能良好,基本满足设计要求。     

固体自润滑材料在EAST超导托卡马克中的应用

EAST超导托卡马克是具有非圆截面的核聚变试验装置,其真空室内部部件在等离子体热壁运行时将承受相当大的热应力和电磁载荷,在某些工况下的应力可能超出材料的强度极限.对EAST超导托卡马克装置中的真空室内部部件的应力状况进行了计算分析,从理论上提出了运用润滑材料的必要性;研制了一种金属基多层固体自润滑复合材料,摩擦学性能测试表明,该自润滑复合材料具有特殊的梯度结构,能保证高的机械强度,且具有优异的摩擦磨损性能和连续润滑功能;有限元计算和模拟件的加热变形试验表明,该自润滑复合材料真空中的滑动摩擦因数不超过0.15,能减少内部部件应力集中的情况,避免应力过大对热沉材料造成的破坏,保障超导托卡马克装置聚变试验的安全.     

A Consideration on Increasing Current Density in Normal Conducting Toroidal Field Coil for Spherical Tokamak Power Plant

The center post is the most critical component as an inboard part of the toroidal field coil for the low aspect ratio tokamak. During the discharge it endures not only a tremendous ohmic heating owing to its carrying a rather high current but also a large nuclear heating and irradiation owing to the plasma operation. All the severe operating conditions, including the structure stress intensity and the stability of the structure, largely limit the maximum allowable current density. But in order to contain a very high dense plasma, it is hoped that the fusion power plant system can operate with a much high maximum magnetic field BT ≥12 T-15 T in the center post. A new method is presented in this paper to improve the maximum magnetic field up to 17 T and to investigate the possibility of the normal conducting center post to be used in the future fusion tokamak power plant.     

Preliminary Thermal Mechanical Analysis of the Equatorial Thermal Shield for ITER

Thermal analysis of the equatorial thermal shield for ITER is conducted in order to confirm that the cooling tube design was reasonable under both the plasma operational and the baking operational conditions.The structural performance was analyzed by means of the finite element software ANSYS.A comparison of the results with design requirements shows that the results of the simulation are within allowable design requirements,which indicates the feasibility and reliability of the equatorial thermal shield structure.     

钛及钛合金型材挤压感应加热炉群控系统研制

钛及钛合金型材挤压窗口温度相对比较窄,因此要求坯料加热温度精确、一致,同时要求感应加热炉与挤压机的协调配合同步控制。针对钛及钛合金型材挤压用的25 MN挤压机及配套的6台200 k W感应加热炉,研制了感应加热炉与挤压机同步协调配合的群控系统。该系统采用Profinet、Profibus、RS485总线构建了加热炉监控主机与挤压控制主机、加热控制机的控制网络,利用模糊PID控制算法实现对温度精确性和一致性的控制,采用多总线实时通讯网络实现感应加热炉与挤压机的同步协调控制。在某企业的实际运行结果证明:该系统对提高钛及钛合金型材质量和挤压生产效率,以及稳定挤压生产工艺具有重要作用,在稀有金属加工领域具有典型应用价值。     

Conceptual Design and Analysis of Cold Mass Support of the CS3U Feeder for the ITER

In the International Thermonuclear Experimental Reactor(ITER) project,the feeders are one of the most important and critical systems.To convey the power supply and the coolant for the central solenoid(CS) magnet,6 sets of CS feeders are employed,which consist mainly of an in-cryostat feeder(ICF),a cryostat feed-through(CFT),an S-bend box(SBB),and a coil terminal box(CTB).To compensate the displacements of the internal components of the CS feeders during operation,sliding cold mass supports consisting of a sled plate,a cylindrical support,a thermal shield,and an external ring are developed.To check the strength of the developed cold mass supports of the CS3U feeder,electromagnetic analysis of the two superconducting busbars is performed by using the CATIA V5 and ANSYS codes based on parametric technology.Furthermore, the thermal-structural coupling analysis is performed based on the obtained results,except for the stress concentration,and the max.stress intensity is lower than the allowable stress of the selected material.It is found that the conceptual design of the cold mass support can satisfy the required functions under the worst case of normal working conditions.All these performed activities will provide a firm technical basis for the engineering design and development of cold mass supports.     

Evolution of the Design of Cold Mass Support for the ITER Magnet Feeder System

This paper presents the evolution of the design of cold mass support for the ITER magnet feeder system. The glass fibers in the cylinder and the flanges of the normal G10 support are discontinuous in the preliminary design. The heat load of this support from the analysis is only 4.86 W. However, the mechanical test of the prototype showed that it can only endure 9 kN lateral force, which is significantly less than the required 20 kN. So, the configuration of the glass fibers in the cylinders and flanges of this G10 support are modified by changing it to a continuous and knitted type to reinforce the support, and then a new improved prototype is manufactured and tested. It could endure 15 kN lateral forces this time, but still not meet the required 20 kN. Finally, the SS316LN material is chosen for the cold mass supports. The analysis results show that it is safe under 20 kN lateral forces with the heat load increased to 14.8 W. Considering the practical application, the requirements of strength is of primary importance. So, this SS316LN cold mass support is acceptable for the ITER magnet feeder system. On the other hand, the design idea of using continuous and knitted glass fibers to reinforce the strength of a G10 support is a good reference for the case with a lower heat load and not too high Lorentz force.