管式电弧加热器电极背侧冷却强化数值模拟  

Numerical Simulation of Back-Side Cooling Enhancement of Huels Type Arc Heater Electrode

作　　者：朱兴营[1] 刘祥[1] 陈海群[1] 欧东斌[1] ZHU Xing-ying;LIU Xiang;CHEN Hai-qun;OU Dong-bin(Beijing Key Laboratory of Arc Plasma Application Equipment,China Academy of Aerospace Aerodynamics,Beijing 100074,China)

机构地区：[1]中国航天空气动力技术研究院电弧等离子体应用装备北京市重点实验室,北京100074

出　　处：《计算机仿真》2024年第11期90-95,402,共7页Computer Simulation

基　　金：国家自然科学基金(92271117)。

摘　　要：基于COMSOL共轭传热对10MW级管式电弧加热器电极的背侧冷却进行了固体传热、流体传热和湍流流动的耦合计算,得到了背侧矩形直肋结构不同肋化系数β、换热表面粗糙度Ra条件下电极的温度和冷却通道流动阻力系数,对计算数据进行了回归分析,得到了β、Ra对弧根处电极温度和冷却通道阻力系数的综合影响的近似表达式。研究结果发现:随着电极背侧肋化系数β从1到2.2不断增加,电极内壁温度单调降低,降幅为12~14%,冷却通道阻力系数则增加了26.3~46.9%,并且在粗糙度较高时,β的变化对阻力系数的影响程度更大。背侧换热表面Ra由3.2um增加到80.6um时,弧根处电极壁面温度随之降低,降幅为6.5%~11%,但随着Ra的提高,增加Ra对降低电极温度的作用逐渐减弱,阻力系数则单调增加了近2倍。利用回归分析得到的表达式可对不同β和Ra条件下的弧根处内壁温度和流动阻力系数进行工程估算。Strengthening the back-side heat transfer of the electrode is an effective way to reduce its temperature and erosion.In this paper,the coupling calculation of solid heat transfer,fluid heat transfer and turbulent flow is car-ried out by using COMSOL for the electrode back-side cooling of 1OMW huels type arc heater,the electrode tempera-ture and the resistance coefficient of cooling channel with different rectangular rib coefficient and surface roughness on the back side are obtained,at the same time,the expression of the comprehensive influence of rib coefficient and sur-face roughness on inner wall temperature of electrode at the placement of arc foot and resistance coefficient of cooling channel are obtained respectively by regression analysis of the simulation data.The results show that when the rib co-efficient increase in the range of 1-2.2,the inner wall temperature of electrode at the placement of arc foot decreases monotonically with a range of 12-14%and the flow resistance coefficient of cooling channel of the electrode increases monotonically with a range of 26.3-46.9%.Moreover,the influence of rib coefficient on the resistance coefficient is more obvious with higher roughness.When the roughness increases from 3.2um to 80.6um,the inner wall temperature decreases with a range of 6.5-11%and the resistance coefficient has almost doubled.However,the effect of increas-ing roughness on reducing the electrode temperature decreases gradually with the increase of roughness.The expres-sions obtained by regression analysis can be used to estimate the inner wall temperature of electrode and resistance coefficient of cooling channel with different rib coefficient and roughness on the back side.

关 键 词：管式电弧加热器电极 背侧冷却 肋化系数 粗糙度 数值研究 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]