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An orthogonal experimental scheme was designed for optimizing a water-cooled structure of the divertor plate.There were three influencing factors:the radius R of the watercooled pipe,and the pipe spacing L1 and L3.The influence rule of different factors on the cooling effect and thermal stress of the plate were studied,for which the influence rank was respectively R>L1>L3 and L3>R>L1.The highest temperature value decreased when R and L1increased,and the maximum thermal stress value dropped when R,L1 and L3 increased.The final optimized results can be summarized as:R equals 6 mm or 7 mm,L1 equals 19 mm,and L3 equals 20 mm.Compared with the initial design,the highest temperature value had a small decline,and the maximum thermal stress value dropped by 19%to 24%.So it was not ideal to improve the cooling effect by optimizing the geometry sizes of the water-cooled structure,even worse than increasing the flow speed,but it was very effective for dropping the maximum thermal stress value.The orthogonal experimental method reduces the number of experiments by 80%,and thus it is feasible and effective to optimize the water-cooled structure of the divertor plate with the orthogonal theory. 相似文献
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In-vessel components are important parts of the EAST superconducting tokamak. They include the plasma facing components, passive plates, cryo-pumps, in-vessel coils, etc. The structural design, analysis and related R&D have been completed. The divertor is designed in an up-down symmetric configuration to accommodate both double null and single null plasma operation. Passive plates are used for plasma movement control. In-vessel coils are used for the active control of plasma vertical movements. Each cryo-pump can provide an approximately 45 m^3/s pumping rate at a pressure of 10^-1 Pa for particle exhaust. Analysis shows that, when a plasma current of 1 MA disrupts in 3 ms, the EM loads caused by the eddy current and the halo current in a vertical displacement event (VDE) will not generate an unacceptable stress on the divertor structure. The bolted divertor thermal structure with an active cooling system can sustain a load of 2 MW/m^2 up to a 60 s operation if the plasma facing surface temperature is limited to 1500 ℃. Thermal testing and structural optimization testing were conducted to demonstrate the analysis results. 相似文献
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JI Xiang 《等离子体科学和技术》2013,15(3):277-281
For safe operation with active water cooling plasma facing components (PFCs) to handle a large input power over a long pulse discharge, some design optimization, R&D and maintenance were accomplished to improve the in-vessel components. For the purpose of large plasma current (1 MA) operation, the previous separated top and bottom passive stabilizers in the low field were electrical connected to stabilize plasma in the case of vertical displace events (VDEs). The design and experiments are described in this paper 相似文献
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A passive stabilization loop (PSL) has been designed and manufactured in order to enhance the control of vertical instability and accommodate the new stage for high-performance plasma at EAST.Eddy currents are induced by vertical displacement events (VDEs) and disrup-tion,which can produce a magnetic field to control the vertical instability of the plasma in a short timescale.A finite element model is created and meshed using ANSYS software.Based on the simulation of plasma VDEs and disruption,the distribution and decay curve of the eddy currents on the PSL are obtained.The largest eddy current is 200kA and the stress is 68MPa at the outer current bridge,which is the weakest point of the PSL because of the eddy currents and the magnetic fields.The analysis results provide the supporting data for the structural design. 相似文献
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齿轮零件是典型的机械零件,针对齿轮传动的特点,提出并行设计环境下齿轮传动零件的CAPP系统的技术原理与实现方法。建立了参数化特征信息模型,提出关联特征约束推理和特征分组的方法。采用基于特征模型的工艺设计方法,建立了工艺知识库,提出了基于规则的工艺决策方法,使特征模型能较好地应用于齿轮传动CAD/CAPP设计。 相似文献
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目前无线传感器网络基于TDMA的MAC协议基本考虑节点处于连续工作而忽略事件驱动状态,没有考虑到复杂多变的网络环境,造成节点能量过度的浪费.提出了一种根据节点实时流量负载的时隙调度算法(TART),TART算法基于簇结构, 采用分布式与集中式相结合的方式,成员节点实时向簇首发送自己数据流量信息,由簇头动态调节簇内节点时隙更新频率和顺序,降低时隙划分的能量和时间代价,减少节点的空闲侦听时间.仿真表明,算法有效地提高了网络能量有效性,延长了网络生存周期,降低数据包的延时. 相似文献
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多媒体通信技术为远程教学模式创造了实时的交互式学习环境,使得当代的远程教育质量和效果大大提高,远程教育的大规模发展已成为可能。但我国目前的远程教育在某些方面还不尽人意,存在传输信息单一、传输速度慢、实时性差等问题,使得远程教学的效果受到很大影响和限制,而导致这些问题的关键是实时交互多媒体通信技术。本文即为华中师范大学网络教育学院周自波老师就基于Web的远程教学模式下实时交互多媒体通信技术的应用所做的一些探析。 相似文献