Researches on the Two-Dimensional Retarded Cascade : Part 1, Contraction Effect in the Cascade

概要

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In the two-dimensional retarded cascade, it is well known that axial velocity increase through the blade row unless boundary layer on the sidewall of the wild tunnel is sucked away. Increase of the axial velocity at outlet often causes a drop in the performance of cascade. The first purpose of this paper is to find, among many factors that prescribe the cascade geometry, which factor affects most remarkably the two-dimensionality of flow. The axial velocity ratio, which represents the degree of two-dimensionality, depends mainly on the virtual retardation ratio cosβ_1/cosβ_2 at the center of blade span. Secondly, the performances of a cascade with solid sidewall and with porous sidewall for boundary layer suction are compared. The difference of the performance between both cascades increases as the inlet becomes larger. Furthermore, comparison between the effective operating ranges of both cascade arrangements shows a remarkable difference in the case of high inlet angles.
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