Multi Block Unsteady Navier Stokes Solution of Compressor Stator in Rotor Wake

Abstract

Numerical solutions of a 2D stator compressor cascade at one inlet Mach number (0.7) and four values of incidence (49°, 51°, 53° and 55°) are obtained. Reynolds averaged, thin layer, compressible Navier Stokes equations are solved by using a multi block, parallel algorithm. Finite differencing approach and LU - ADI splitting technique are used. BaldwinLomax turbulence model is applied. Computational pressure distribution and boundary layer results obtained with uniform inlet velocity profiles are compared well with the available experimental data. Rotor wake effects are simulated by defining non-uniform inlet velocity profiles. Steady non-uniform inlet velocity profiles with various shift locations along the tangential direction are tested. Unsteady computations are also performed with moving non-uniform inlet velocity profiles and it is shown that the amplitude of the normal force oscillations are higher at lower frequencies.