扩压器型面局部张角的计算及附面层修正

本文主要研究成果是对采用等压力梯度及等速度梯造型规律的扩压器各截面型面局部张角提供了一种精确的理论计算方法。并为采用参考文献[3]进行扩压器附面层位移厚度的计算提供了条件。

Calculation of Local Divergence Angle of Diffusers and Correction of Boundary Layer

Reference [3] presented a correction method for the boundary layer atstraight wall of diffusers with constant divergence angle, but the correctionmethod for curved-contour diffusers often used in engineering has not beendealt with in reference [3] and in other related papers recently published. The main contribution of this paper is to present an accurate theoreticalmethod for calculating the local divergence angle of diffusers of curved wallwith constant pressure gradient or constant velocity gradient. Thus it becomespossible to extend reference [3] to find solution for the problem of boundarylayer correction for diffusers with curved walls. This paper uses "Spey" engine diffuser as an example significant of calcu-lation. The deviation for boundary layer correction will be, when diffuserwall curvature is large because in the method of correction, some boundarylayer results for flat plate are used. when the curvature of diffuser wall issmall, such as thewall of prefixed diffuser, the correction is sisfactory.