高超声速边界层基频二次失稳条纹结构的稳定性

来源 :空气动力学学报 | 被引量 : 0次 | 上传用户：cxxcxj

【摘要】

：

近年来在高超声速边界层的直接数值模拟和静风洞实验研究中,相继发现了边界层转捩前出现的典型基频模态二次失稳现象,其主要成分为流向条纹结构.全文以高超声速平板边界层为研究对象,采用线性稳定性分析和二次稳定性分析的方法,对边界层内条纹结构的产生机制和无黏稳定性特征进行了研究.结果表明:首次失稳扰动幅值对二次失稳类型有影响.当首次失稳扰动幅值较大时,基频模态占主导,其主要成分为条纹结构,表现为流向涡.该条纹结构存在着多个无黏失稳模态,其中低频模态对应于第一模态在三维边界层内的扩展,高频模态对应于可压缩的第二模态.

【作者】

：

李玲玉刘建新

【机构】

：

天津大学机械工程学院高速空气动力学研究室,天津 300072

【出处】

：

空气动力学学报

【发表日期】

：

2021年5期

【关键词】

：

二次失稳基频模态条纹结构高超声速边界层 Mack模态

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高超声速边界层基频二次失稳条纹结构的稳定性

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