[1]周纪瑜,徐益谦,魏启东.JS—2磁流体发电机电极的温度场与热应力的数值分析[J].东南大学学报(自然科学版),1983,13(1):47-55.[doi:10.3969/j.issn.1001-0505.1983.01.005]
 Zhou Ji-yu. Xu Yi-qian,and Wei Qi-dong.Numerical Analysis of Temperature Field and Stress Field for JS-2 MHD Generator Electrodes[J].Journal of Southeast University (Natural Science Edition),1983,13(1):47-55.[doi:10.3969/j.issn.1001-0505.1983.01.005]
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JS—2磁流体发电机电极的温度场与热应力的数值分析()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
13
期数:
1983年第1期
页码:
47-55
栏目:
本刊信息
出版日期:
1983-03-20

文章信息/Info

Title:
Numerical Analysis of Temperature Field and Stress Field for JS-2 MHD Generator Electrodes
作者:
周纪瑜徐益谦魏启东
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Author(s):
Zhou Ji-yu. Xu Yi-qian and Wei Qi-dong
关键词:
合金电极 热应力分布 放热系数 温度场 磁流体发电机 陶瓷电极 温度分布 燃气 有限单元法 边界条件
分类号:
+
DOI:
10.3969/j.issn.1001-0505.1983.01.005
摘要:
本文以JS-2磁流体发电机的一种陶瓷电极和二种金属电极为例,从工程角度描述了求解电极温度场及热应力的控制方程。给出了相应的热边界条件和位移约束条件。文中特别指出,由于通道中强磁场和强电场的存在,一方面由于哈特曼效应和气流分层化使燃气向通道壁的放热系数减小,另一方面由于附面层内电流的焦耳热使放热增强,其对流放热系数的修正由数学关系式给出。文中并根据理论分析和实验结果对电极内部由于非均匀分布的电流的焦耳效应作了讨论,确定电流沿壁面按指数规律分布,其焦耳效应作不均匀内热源计入运算。对导电燃气和电极壁面热辐射对应的放热系数文中也作了估计。文中的计算采用有限单元法进行。材料的物性认为是随温度变化的函数。用迭代方法达到温度分布与选取物性的耦合。燃气热力性质和流动状态系依据燃气组分计算及通道准一维计算的结果。文章计算结果给出了电极上的等溫线分布和热应力分布。为分析电极结构的合理性和进行新电极的设计提供了理论依据。
Abstract:
Using a kind of ceramic electrodes and two kinds of metal electrodes as examples this paper describes governing equations for solving the temperature field and stress field of JS-2 MHD generator electrodes and gives relevant thermal boundary conditions and displacement constraints. It is indicated that because of the presence of strong magnetic and electric field in the MHD generator channel the Hartmann effect and the laminarization of gas decrease, the convective heat transfer, whereas the Joule heating increases it. The effects of these factors on the convective heat transfer coefficient can be calculated with fomulas given in this paper. Also considered was the radiant heat transter from the plasma to the electrode walls. As an internal heat source the Joule heat of the current through the electrode was calculated. On the basis of theoretical analysis and experimental measurements the profile of the current density along the X direction can be expressed as an exponential function of X. The, finite clement method was used for the calculation of the temperature, field and stress field. Since the physical properties of electrode materials are the functions of temperature the iteration was used in order to calculate the temperature: profile idenhical with that used fo calculating the physical properties of electrode materials. The thermodynamic properties and flow conditions of combustion gas were calculated on the bases of calculation of combustion gas composition and quasi-one-dimensional model of the MHD channel. The calculated profiles of isothermal and thermal stress in the electrodes can be used as the bases for analysing the rationality of the electrode structure and for improving the electrode design.
更新日期/Last Update: 2013-05-01