On the Relation between Subsonic Part of Supersonic Cascade and Directions of Outlet Flow

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  • 超音速翼列の亜音速部と流出方向の関係について
  • チョウオンソクヨクレツ ノ アオンソクブ ト リュウシュツ ホウコウ ノ カンケイ ニ ツイテ

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Abstract

This paper deals with the analitical method to obtain the directions of outlet flow of the subsonic flow down-stream a normal shock in the neighbouring blades of the two-dimensional supersonic cascade of which subsonic part consists of straight surfaces. This method first solves the problem for the corresponding invisid flow, and then applied its solution to the compressible flow by Karman-Tsien's method. According to the analysed results, the relation α-∞≥α+∞≥(1/2)α-∞ exists between the outlet flow direction α+∞ and the divergence angle of the subsonic part α-∞, and the outlet flow direction coincides with the tangential detection to the pressure side, when a normal shock occurs at the trailing edge of a blade. The more upstream a normal shock occurs in the subsonic region, the nearer the outlet flow direction turns to the suction side of the blade first rapidly and then slowly.

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