轮胎型真空室在核聚变装置上的设计与分析研究

在磁约束核聚变装置中,真空室是一个非常重要的关键部件,它为高温等离子体提供洁净运行环境。KTX装置是一种反场箍缩核聚变装置,它有别于托卡马克装置和仿星器核聚变装置。目前核聚变装置上使用的真空室由多个虾米扇段通过焊接成环形真空室,此类型真空室焊缝数量多,焊缝距离长,焊接变形控制难度大。根据装置要求,KTX磁约束核聚变装置真空室设计为轮胎型结构,大半径为1.4 m,截面半径为0.4 m,真空度为1.5×10-6Pa,且具有易于进入维护和更换真空室内部部件功能。本论文针对KTX装置真空室设计要求和技术参数,对轮胎型真空室开展设计,在设计过程中,基于真空室各种运行工况,对真空室开展了热、电磁和结构相关方面分析计算,根据计算结果对真空室进行优化和验证。本类型真空室设计和分析方法为未来磁约束核聚变装置真空室设计研制提供参考和借鉴。     

Thermal analysis and optimization of the EAST ICRH antenna

The ion cyclotron resonance of frequency heating(ICRH) plays an important role in plasma heating.Two ICRH antennas were designed and applied on the EAST tokamak.In order to meet the requirement imposed by high-power and long-pulse operation of EAST in the future,an active cooling system is mandatory to be designed to remove the heat load deposited on the components.Thermal analyses for high heat-load components have been carried out,which presented clear temperature distribution on each component and provided the reference data to do the optimization.Meanwhile,heat pipes were designed to satisfy the high requirement imposed by a Faraday shield and lateral limiter.     

Buckling Analysis of TF Coil Inner Leg for Central Solenoidless Tokamak

The central post is one of the critical components for the low aspect ratio tokamak, which endures not only a tremendous ohmic heating because it carries a rather high current, but also a large neutron heating and irradiation owing to the plasma operation. The DS copper alloy Glidcop AL-25[8] was chosen as the conductor material for its adequate mechanical properties and physics properties. The central post has a cylindrical structure with lots of cooling channels. The length of the central post for the next generation of nuclear fusion spherical tokamaks will be more than 10 m or 20 m. The structural stability is very crucial. When the applied load is larger than the structure critical buckling load, the device will lose its stability and collapse. In order to calculate the critical buckling load, a 1/6-segment finite element model was used and the force acting on the central post was simulated. The results showed that the vertical compressive stresses mainly affect the stability of the central post. The linear buckling analysis results with finite element method based on small deformation theory were given in this paper. The relation curves and functions for buckling factor, depending on the different lengths and the radius of the central post, the diameter of cooling channel and the maximum allowable current density, were also shown.     

瑞丽江一级电站大坝表孔弧门及液压启闭机安装

简述大坝溢流表孔弧门及液压启闭机主要技术特性、设备现场吊装方案、安装施工工艺、安装质量控制、液压启闭机调试及液压试验、油泵试验、弧门无水启闭试运行、弧门在设计水头下动水启闭试运行等情况，确认弧门及液压启闭机安装施工质量符合设计标准、厂家技术要求及规范中明确的优良标准，完全满足首部工程防洪度汛、水库下闸蓄水及汛期水库水位的调节需要。     

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。     

EASTICRF天线法拉第屏蔽的热-结构分析

在EASTICRF天线中,法拉第屏蔽是ICRF天线中的一个非常重要的部件。实验时,它位于真空室内直接面对等离子体,将承受着很大的热负荷。基于EASTICRF天线法拉第屏蔽结构的安全性,本文利用有限元的方法,首先对热负荷最大的法拉第屏蔽冷却管道在不同水流速下进行热分析,考察在不同水流速工况下法拉第屏蔽冷却管道上的温度分布情况,再通过热 结构耦合方法对法拉第屏蔽冷却管道进行结构分析,了解法拉第屏蔽在不同水流速下的应力大小和分布情况,分析结果为未来EASTICRF天线实验提供理论指导。另外,对法拉第屏蔽冷却管道结构进行了优化改进,并对优化改进后的法拉第屏蔽冷却管道在相同工况下进行了热和热 结构分析,分析结果确定了优化改进后的法拉第屏蔽冷却管道结构的优越性,分析数据为未来法拉第屏蔽冷却管道的优化改进提供理论指导,分析方法为其他同类装置提供有益的参考。     

采用辐射变色薄膜的束流位置诊断研究

依据SC200超导质子回旋加速器的束流特性及调试需求,在质子束加速及引出的过程中需精确测量主机束流的位置信息。提出了采用辐射薄膜进行加速器束流位置诊断的方法,通过剂量计算得到了不同测量位置的薄膜最佳使用类型,借助测试平台对所有选型的薄膜进行实验验证。为优化薄膜的辐照变色效果,结合剂量及实验分析给出了不同测量位置的最佳照射时间。完成了所测位置的薄膜固定装置设计,并提出将薄膜变色区域可视化得束流位置信息的处理方案。     

小湾水电站坝顶公路边坡综合治理设计综述

文章介绍了小湾水电站左岸6号山梁坝顶公路以上部位的边坡综合治理设计，包括基本地形地质条件分析、边坡失稳机制和模式研究、边坡稳定性评价、综合治理设计原则和工程措施。     

噻虫胺在水稻和土壤中的残留及消解动态

[目的]通过2年3地的水稻田间试验,研究了50%噻虫胺水分散粒剂在水稻和土壤中的残留及消解动态。[方法]利用QuEChERS-HPLC-MS/MS法。[结果]噻虫胺在水稻植株、土壤、田水中的消解动态符合一级反应动力学方程。2016年安徽植株、田水、土壤中半衰期分别为7.5、5.6、6.5d;辽宁分别为8.7、3.4、8.1d;浙江分别为5.3、7.8、13.3d;2017年安徽植株、田水、土壤中半衰期分别为6.5、4.3、23.9d;辽宁分别为5.5、5.4、11.7d、浙江分别为9.0、7.7、27.7d。当50%噻虫胺水分散粒剂以120、180ga.i./hm2 2个剂量分别施药2~3次,施药间隔30d时,噻虫胺在水稻植株、糙米、土壤中的最终残留量小于0.07mg/kg。[结论]噻虫胺属于易降解农药,在糙米的最终残留量小于我国制定的噻虫胺在糙米中的最大残留限量0.2mg/kg。     

Seismic response analysis for equatorial diagnostic port plug of international thermonuclear experimental reactor

Modal analysis and seismic response analysis were carried out for the equatorial diagnostic port plug of international thermonuclear experimental reactor (ITER). The aim of the theoretical analysis is to verify structural strength and reliability of the device. The working condition includes one-dimensional seismic wave and two-dimensional seismic wave. Modal analysis of the device shows that primary vibration is inclined to occur in low-order modes. The horizontal (X-direction, Y-direction) maximum vibration appears at the first and the fourth eigen modes, with the natural frequency of 70.59 and 215.88 Hz respectively, and the vertical (Z-direction) primary vibration appears at the second eigen mode with the natural frequency of 82.85 Hz. According to the results of the finite element analysis (FEA) program, the weak portions of the device are distributed in the joint of port body with blanket shielding module (BSM) and inner side wall of ribbed plate for lifting flange, the maximum von Mises stress is 14.8 MPa with the Y-direction seismic wave. In accordance with the design criteria, the destructive effect is far below the failure boundary, and the structural reliability of the equatorial diagnostic port plug can meet the requirements of the design specifications. Foundation item: Project(10405024) supported by the National Natural Science Foundation of China; Project supported by International Thermonuclear Experimental Reactor Organization in France