文献详情
Spatial-Temporal Instability of an Inviscid Shear Layer
文献类型期刊
作者Fu, Qing-fei[1];Qin, Li-zi[2];Yang, Li-jun[3]
机构
通讯作者Yang, LJ (reprint author), Beihang Univ, Sch Astronaut, Beijing 100191, Peoples R China.
来源信息年:2017  
期刊信息INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING影响因子和分区  ISSN:1687-5966
摘要In thiswork, we explore the transitionof absolute instability andconvective instability in a compressible inviscid shear layer, through a linear spatial-temporal instability analysis. From linearized governing equations of the shear layer and the ideal-gas equation of state, the dispersion relation for the pressure perturbation was obtained. The eigenvalue problem for the evolution of twodimensional perturbation was solved by means of shooting method. The zero group velocity is obtained by a saddle point method. The absolute/ convective instability characteristics of the flow are determined by the temporal growth rate at the saddle point. The absolute/ convective nature of the flow instability has strong dependence on the values of the temperature ratio, the velocity ratio, the oblique angle, and.. number. A parametric study indicates that, for a great value of velocity ratio, the inviscid shear layer can transit to absolute instability. The increase of temperature ratio decreases the absolute growth rate when the temperature ratio is large; the effect of temperature ratio is opposite when the temperature ratio is relatively small. The obliquity of the perturbations would cause the increase of the absolute growth rate. The effect of.. number is different when the oblique angle is great and small. Besides, the absolute instability boundary is found in the velocity ratio, temperature ratio, and.. number space.
收录情况SCIE(WOS:000398640100001)  
所属部门宇航学院
DOI10.1155/2017/8532507
学科工程:宇航
人气指数26
浏览次数26
基金National Nature Science Foundation of China [11672025, 11302013]; China Scholarship Council [201506025044]
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