关键词: 压气机;叶栅流;流场仿真;数值计算;网格生成

Abstract: A new kind of H-type grid generation method was proposed, by which the generated grid lines orthogonally intersect at blade surfaces. The method was successfully applied to grid generation of several types of compressor cascade flow fields. It was also proposed that in blade wake region the grid node distribution along the cascade tangent direction should gradually tend to uniformity and adapt to flow parameter variation in the region. To analyze influence of grid line intersection angle at the wall on calculated results, expression of discrete errors of the derivatives in relation to the angle was deduced. Numerical calculation of a plate turbulent boundary layer and cascade flows were performed. The investigation demonstrates that the intersection angles of grid lines at solid walls have significantly influence on the predicted results in the boundary layer regions; but nearly have no evident influence on the results in the potential regions.

Key words: Air compressor;Cascade flow;Flow field simulation;Numerical calculation;Grid generation