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通过引入依赖于密度的物面法向速度变换wr=-1ρh1h∫2z0h1h2ρtdz,描述物理速度空间(ua,va,wa=u,v,w+wr)具有无滑移壁面条件的三维可压缩非定常连续方程可转换成变换速度空间(u,v,w)内具有无滑移条件定常连续方程。因此,采用定常壁面分离的分析方法和结论,再通过变换和研究wr的贡献,给出了三维可压缩非定常壁面分离的判则以及分离线附近的流动形态。研究指出,二维和三维情况下,都出现伴有壁外附着的壁面分离情况。数值模拟证实了理论和结论。
Describing the three-dimensional (3D) shape of the physical velocity space (ua, va, wa = u, v, w + wr) with slip-free wall surface conditions by introducing a densit- The compressible unsteady continuous equation can be transformed into a stationary continuous equation with no slip conditions in the transformation velocity space (u, v, w). Therefore, by using the analysis method and conclusion of steady wall separation, the criterion of three-dimensional compressible unsteady wall separation and the flow pattern near the separation line are given by transforming and studying the contribution of wr. It is pointed out that in the two-dimensional and three-dimensional cases, the separation of the wall with the attachment of the wall occurs. Numerical simulation confirmed the theory and conclusion.