STABILITY ANALYSIS OF SUPERSONIC BOUNDARY/MIXING LAYERS CONFLUENT FLOW
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摘要: 利用可压缩线性稳定性理论研究了超声速混合层考虑壁面影响流动时的失稳特性. 基本流场选取了具有不同速度特征的2 股均匀来流，进入存在上下壁面的流道中. 混合层与边界层的距离为1~3 个边界层厚度，其中壁面取为绝热壁. 分析了该流动在超声速情况下的稳定性特征，同时还讨论了不同波角下的三维扰动波的演化特点，并与二维扰动波进行了比较和分析. 研究结果表明，在此流动情况下，边界层流动和混合层流动的稳定性特征同时存在，并互有影响，其流动稳定性特征既有别于单纯的平板边界层，也有别于单纯的平面混合层，呈现出了新的稳定性特征.Abstract: A compressible supersonic confluent flow composed of boundary layers and mixing layers are studied by linear stability theory. The flow is confined in a two-dimensional adiabatic channel. A slower flow lying in the center mixes with faster boundary layer flows on both sides and two mixing layers are evolved near the centerline. Different unstable modes were discovered and the first mode was found to be most unstable. Three-dimensional disturbances were investigated and comparison of instability features was made with unconfined boundary layer flows. The investigation of different widths of slow flow was also made.
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Key words:
- mixing layer /
- boundary layer /
- linear stability
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