直管路内の擬似衝撃波の発生位置と構造に関する実験的研究

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This paper describes an experimental study on the locations and structures of pseudo-shock waves in straight ducts with rectangular cross sections when the flows are choked at the duct exits. The ranges of experiments were 1.72≦M_∞≦1.85 and 20.6≦L/D≦23.6, where M_∞ is the Mach number at the duct entrance L the length of the duct and D(=50mm) the width of the duct. It is shown that the location of pseudo-shock waves moves in a downstream direction with decreasing L/D and increasing M_∞. As the location of pseudo-shock waves moves in a downstream direction, the shape of the pseudo-shock waves changes from λ-type to X-type because of the increase of wall turbulent boundary layer thickness. It is also shown that the diffusion rate of low speed region near the duct wall in a pseudo-shock wave becomes smaller as the location of pseudo-shock wave moves in a downstream direction.
社団法人日本機械学会の論文
1986-12-25