Theoretical analysis and prediction method for the trailing edge loss of turbine cascade with coolant injection

A two-dimensional, compressible flow model for loss created by mixing the flow behind the turbine cascade with coolant injection is presented, based on the theory developed by Denton. The principal mechanism and characteristics of loss caused by the flow mixing due to wake, coolant and base flow (base pressure) have been discussed in this paper. Calculation results show that the coolant flow mass, base pressure and boundary layer momentum thickness have a great effect on the trailing edge loss. This paper presents the quantitative analysis results to assess the effects of above parameters on the trailing edge loss.