Sensitivity of Instability Mechanisms to Trailing-Edge Boundary Conditions in High-pressure Turbine Flows

Abstract

Multi-dimensional linear stability analyses were conducted using forced compressible Navier–Stokes simulations. The base flows were obtained from a previously conducted direct numerical simulation of a high-pressure turbine vane at Re = 0.57 × 106 and M = 0.9, and from an additional two-dimensional simulation of the same configuration with trailing-edge blowing. The latter case does not exhibit pressure waves originating from the trailing edge impinging on the suction side of the adjacent blade. For the case without trailing-edge blowing, the temporal pulse response reveals the presence of an acoustic feedback loop with amplitude increasing quickly over time. It is also found that the base f..