径向无叶扩压器内三元边界层分离点的预测

INITIAL SEPARATION POINT PREDICTIONS OF THREEDIMENSIONAL BOUNDARY LAYERS IN RADIAL VANELESS DIFFUSERS

一、引言 由无叶扩压器本身产生的分离是与三元边界层分离紧密相关的。三元边界层分离的特点是在分离点处的壁面上有一条分离线。分离后的边界层有时还会出现再附线。由于径向无叶扩压器内流动的轴对称性。

A new method is proposed for the solution of Johnston's triangle model. The 3D boundary layers are computed by combining this model with White's wall-law. The calculated wall-streamline angles and boundary layer separation points approximately coincide with the results of visualization experiments.