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NUMERICAL ANALYSIS OF ACOUSTIC RADIATION VORTICAL MODES IN A SPATIALLY EVOLVING SUPERSONIC PLANE SHEAR LAYER
Author(s): SHEN Qingwangqiangzhuangfenggan(chinaacademyofaerospaceaerodynamics, BEIJING 100074, china)
Pages: 7-
14
Year: 2007
Issue:
1
Journal: Acta Mechanica Sinica
Keyword: 可压缩剪切层; 线性稳定性; 超声速模态; 特征函数; 直接数值模拟;
Abstract: 对Mc=1.2二维超声速空间发展平面自由剪切层,进行了扰动模态及流动结构的数值分析.采用时空三阶改进MacCormack格式,差分求解可压缩扰动Navier-Stokes方程,直接数值模拟入口不同基频谐波扰动的非线性演化特征.采用空间线性稳定性理论证明,计算所促发的扰动波是声辐射涡模态.扰动参数及特征函数分析显示,声辐射涡模态是弱色散的快/慢两种外部模态,在扰动对流Mach数为超声速一侧呈膨胀/压缩状辐射.单频受迫扰动可无相差地促发多模态混合扰动波,而在自然扰动条件下,剪切层的稳定性受慢模态主导.
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