本文關鍵詞：基于變均布霍爾系數(shù)的磁控熱防護系統(tǒng)霍爾效應影響　出處：《物理學報》2017年05期 　論文類型：期刊論文

  更多相關文章： 磁流體控制 熱防護 霍爾效應 耦合計算

【摘要】：為研究霍爾效應對磁控熱防護系統(tǒng)的影響機理,建立并驗證了熱化學非平衡流場、外加磁場、感應電場的多場耦合數(shù)值求解方法.基于均布霍爾系數(shù)模型分析了霍爾效應在兩種不同磁場強度B_0、不同壁面導電條件下對磁控效果的影響.研究表明,不同壁面導電性下霍爾效應的影響規(guī)律不同.絕緣壁面條件下,考慮霍爾效應后壁面熱流的變化是附面層內洛倫茲力的變化與激波層厚度的減小二者共同作用的結果.B_0=0.2 T時洛倫茲力增加附加的流體減速作用占主導,磁控熱防護效果優(yōu)于忽略霍爾效應的情況,并且在霍爾系數(shù)為5.0達到最優(yōu);而當B_0=0.5 T時,激波層變薄對附面層外緣溫度的增加占主導,磁控熱防護效果變差,并且隨霍爾系數(shù)的增加壁面熱流越來越大.導電壁面條件下,隨著霍爾系數(shù)的增加,磁控激波以及熱防護效果變差,且當β≥5.0時,磁控熱防護系統(tǒng)幾乎完全失效.
[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，

本文編號：1383564