Control of Corner Separation by Optimized Slot Configuration in a Linear Compressor Cascade

In order to control the separation which occurs in the corner formed by the suction side of a compressor blade and the end-wall, a slot connecting the pressure side to the suction side can be used. Based on the optimization of the slot design at the root of the linear compressor cascade blades, experiments and numerical simulations have been conducted to evaluate the effects of the slot at several incidence angles. Total pressure loss coefficient, averaged static pressure rise coefficient and feature of the 3D separation in the cascade passages at 4° incidence angle have been compared for the cases with and without slots. The results show an obvious improvement when using such a slot for the control of corner separation.