Numerical Investigation of Total-Pressure Recovery Coefficient of Cascade in Unsteady Environment

A numerical method based on Ni and implicit dual-time steps scheme for solving the 2-D unsteady N-S equations is applied to investigating the influence of unsteadiness on the total-pressure recovery coefficient of turbine cascade,results of which are compared with that of the steady model and quasi-steady model introduced in this paper.Calculated results show that the unsteadiness of flow can increase the total-pressure recovery coefficient of cascade,when compared with quasi-steady flow.The unsteady flow tends to decrease the total-pressure recovery coefficient when compared with steady flow.