基于变均布霍尔系数的磁控热防护系统霍尔效应影响

发布时间：2018-01-05 14:37

  本文关键词：基于变均布霍尔系数的磁控热防护系统霍尔效应影响　出处：《物理学报》2017年05期 　论文类型：期刊论文

  更多相关文章： 磁流体控制 热防护 霍尔效应 耦合计算

【摘要】：为研究霍尔效应对磁控热防护系统的影响机理,建立并验证了热化学非平衡流场、外加磁场、感应电场的多场耦合数值求解方法.基于均布霍尔系数模型分析了霍尔效应在两种不同磁场强度B_0、不同壁面导电条件下对磁控效果的影响.研究表明,不同壁面导电性下霍尔效应的影响规律不同.绝缘壁面条件下,考虑霍尔效应后壁面热流的变化是附面层内洛伦兹力的变化与激波层厚度的减小二者共同作用的结果.B_0=0.2 T时洛伦兹力增加附加的流体减速作用占主导,磁控热防护效果优于忽略霍尔效应的情况,并且在霍尔系数为5.0达到最优;而当B_0=0.5 T时,激波层变薄对附面层外缘温度的增加占主导,磁控热防护效果变差,并且随霍尔系数的增加壁面热流越来越大.导电壁面条件下,随着霍尔系数的增加,磁控激波以及热防护效果变差,且当β≥5.0时,磁控热防护系统几乎完全失效.
[Abstract]:In order to study the influence mechanism of Hall effect on magnetically controlled thermal protection system, the thermochemical non-equilibrium flow field and external magnetic field were established and verified. The effect of Hall effect on magnetic control effect under two different magnetic field intensities B _ 0 and different wall conductive conditions is analyzed based on the uniform Bouhor coefficient model. The influence law of Hall effect is different under different wall conductivity. The variation of wall heat flux after consideration of Hall effect is the result of both the variation of Lorentz force in boundary layer and the decrease of shock layer thickness. At T, the Lorentz force increases the additional fluid deceleration. The effect of magnetically controlled thermal protection is better than that of neglecting Hall effect, and the optimum is obtained when the Hall coefficient is 5.0. When B _ 0 ~ (0.5 T) T, the thinning of shock layer dominates the increase of boundary temperature, the effect of magnetically controlled thermal protection becomes worse, and with the increase of Hall coefficient, the wall heat flux becomes larger and larger, under the condition of conducting wall. With the increase of Hall coefficient, the effect of magnetically controlled shock wave and thermal protection becomes worse, and when 尾 鈮，

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