Hypersonic modification and verification of Langtry-Menter transition model
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摘要:
针对高超声速边界层转捩流动预测问题,基于传统Langtry-Menter转捩模型和SST(shear stress transport)湍流模型开展高速修正方法研究,将高超声速横流判据修正、湍动能压力膨胀项可压缩性修正和压力梯度系数修正引入到原始转捩模型,以拓展模型在高超声速边界层流动转捩的预测能力,并采用超声速平板、0°攻角高超声速直锥、小攻角高超声速尖锥和HIFiRE-5等6个典型算例对修正后的转捩模型的预测能力进行验证。研究结果表明:修正后的转捩模型所预测的转捩起始位置、转捩终点位置和转捩区长度与实验结果基本吻合,壁面摩擦阻力和热流的计算结果与实验测量结果基本一致,修正后的转捩模型对高超声速边界层转捩的预测能力较好。
Abstract:For the prediction of hypersonic boundary layer transition flow, three types of high-speed modified methods were studied based on the traditional Langtry-Menter transition model and SST (shear stress transport) turbulence model. The modification of hypersonic cross-flow criterion, compressibility modification of turbulent kinetic energy pressure dilatation term and modification of pressure gradient coefficient were introduced into the original transition model to expand the simulation capacity of the model in hypersonic flow. The modified transition model was validated by using several typical cases: supersonic plate, hypersonic cone with zero angle of attack, hypersonic cone with small angle of attack and hypersonic HIFiRE-5. The results showed that the predicted transition-start position, transition-end position and transition zone length of the modified model were basically consistent with the experimental results. The calculated results of skin friction and heat flux were basically consistent with the experimental measurement data. The modified transition model performed well in predicting hypersonic transition flow.
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Key words:
- hypersonic flow /
- boundary layers /
- cross-flow criterion /
- transition flow /
- turbulence models
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表 1 4套计算网格的属性
Table 1. Properties of the four sets of grids
网格 网格数量
(流向×法向)第一层网格间距/
μmGrid A 175×120 10 Grid B 219×190 5 Grid C 259×200 1 Grid D 329×220 0.5 表 2 高超声速圆锥计算条件
Table 2. Calculation conditions for the hypersonic cone
算例 $ M{a_\infty } $ $ {T_\infty }/{\mathrm{K}} $ $ {\rho _\infty }/ ({\mathrm{kg}}/{{\mathrm{m}}^3}) $ $ R{e_\infty }/10^6\;{\mathrm{m}}^{-1} $ $ {T_{{\mathrm{wall}}}}/{\mathrm{K}} $ 1 7.15 231.1 0.07060 9.92 301.0 2 6.58 214.0 0.12568 16.7 301.3 注:表中下标$\infty $表示来流参数,Twall表示壁面温度。 表 3 3套直锥计算网格的属性
Table 3. Properties of three sets of straight cone grids
网格 网格数量
(流向×法向×周向)第一层网格间距/
μmGrid 1 104×60×13 10 Grid 2 186×101×31 1 Grid 3 226×150×37 0.5 -
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