1Lab. Mecânica dos Fluidos, Dep. Eng. Electromecânica, Universidade da Beira Interior, R. Marquês D’Ávila e Bolama, 6201-001 Covilhã, Portugal.
2Rolls-Royce UTC, Dep. of Aeronautical and Automotive Engineering, Stewart Miller Building, West Park, Loughborough University, Loughborough LE11 3TU, U.K.
3Rolls-Royce UTC, Dep. of Aeronautical and Automotive Engineering, Stewart Miller Building, West Park, Loughborough University, Loughborough LE11 3TU, U.K.
4Lab. Mecânica dos Fluidos, Dep. Eng. Electromecânica, Universidade da Beira Interior, R. Marquês D’Ávila e Bolama, 6201-001 Covilhã, Portugal.
The accuracy of computer codes for turbomachinery flowfield calculations is strongly reliant on the type and behaviour of the turbulence model used in the computations. Therefore, the validation of these codes is inherently dependent on results from experimental databases for the class of flow under study. In the present paper, the RR Hydra CFD code is applied to the analysis of the flow through a compressor cascade as a benchmark test case. Hydra is an integrated suite of CFD codes for the analysis and design of turbomachinery and external aircraft components. The algorithm is based on a five-stage Runge-Kutta time-marching scheme. The solver can handle steady inviscid and viscous flow in two and three dimensions. Turbulence is modelled using the Spalart-Allmaras model. In accurate modelling of cascade flows axial velocity density ratio (AVDR) plays a very significant role. Actually, this is a key issue for both experimental and numerical modelling of cascade flow. In the present work evidence is given on how the AVDR value attained for the cascade is strongly reliant on inlet turbulence intensity boundary condition. This is related to boundary layer thickening on side-walls. Results will be presented for a 3 D high turning (50°) DCA rectilinear compressor cascade under different inlet conditions.
Navier-Stokes, time-marching, unstructured and multiblock grid, turbulence modelling, compressor cascade
