高雷诺数湍流撞击流中的变密度效应：拟序结构和输运特性*

doi:10.7523/j.ucas.2025.035

摘要/Abstract

摘要： 本文对高雷诺数湍流撞击流中的变密度效应开展高保真数值模拟研究,借助本征正交分解（POD）方法,分析了不同密度比下的拟序结构特征。通过对比空气/空气与氦气/空气两个工况,揭示了变密度效应对拟序结构和输运特性的重要影响。结果表明：变密度效应强化了撞击区的流向涡,抑制了高密度侧的回流涡,导致流向涡提前破碎。在下游区,Kelvin-Helmholtz不稳定性导致展向涡的产生,与空气/空气相比,氦气/空气中的展向涡尺寸较小,强度沿流向衰减较快。有关输运特性的分析结果表明,流向涡增强了撞击面附近的湍流输运,展向涡促进了整个横向通道内的湍流输运。氦气/空气中的变密度效应有效增强了撞击区的质量输运,但在下游区域整体上削弱了质量输运。

关键词: 变密度效应, 涡结构, 本征正交分解, 撞击流

Abstract: High-fidelity numerical simulations are performed to investigate the variable-density effects in high Reynolds number turbulent impinging streams. The characteristics of coherent structures under different density ratios are analyzed using Proper Orthogonal Decomposition (POD). The significant effects of variable density on coherent structures and transport properties are revealed through the comparison between two cases: air/air and helium/air impinging streams. Results demonstrate that variable-density effects enhance streamwise vortices in the impinging region while suppressing recirculation vortices on the high-density side, leading to premature breakdown of streamwise vortices. In downstream region, Kelvin-Helmholtz instability induces the generation of spanwise vortices. The spanwise vortices for helium/air are smaller in size and have higher decay rate, in comparison with those for air/air. The results about transport property analysis indicate that streamwise vortices enhance turbulent transport near the impingement surface, while spanwise vortices promote turbulent transport across the entire lateral extend of exit channel. The variable-density effect for helium/air effectively enhances mass transport in the impinging region but generally weakens overall mass transport in downstream region.

Key words: Variable-density effects, Vortical structures, Proper Orthogonal Decomposition, Impinging streams

中图分类号:

TQ021.1

尤东垚, 曹玉会. 高雷诺数湍流撞击流中的变密度效应：拟序结构和输运特性^*[J]. 中国科学院大学学报, DOI: 10.7523/j.ucas.2025.035.

YOU Dongyao, CAO Yuhui. Variable-density effects in high Reynolds number turbulent impinging streams: coherent structures and transport property[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2025.035.

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高雷诺数湍流撞击流中的变密度效应：拟序结构和输运特性^*

Variable-density effects in high Reynolds number turbulent impinging streams: coherent structures and transport property

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