Computation of Transonic 2D Cascade Flow and Comparison with Experiments,
MOTOREN- UND TURBINEN-UNION G M B H MUNICH (GERMANY F R)
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This paper describes a time-marching finite area method to obtain the steady 2D blade to blade solution along an axisymmetric stream surface with changing radius and stream tube thickness. The conservation laws are solved in a rotating frame. The numerical scheme is explicit and first order accurate in time and space. To achieve stability, explicit numerical viscosity is added. Three alternative methods of ensuring the zero normal velocity condition along the solid walls are analysed and their application is discussed. In order to increase the convergence speed, a sequential grid-refining procedure and a multiple grid algorithm are used in the code. The accuracy and computational efficiency of the computer code are demonstrated for realistic blade geometries. The comparison with aerofoil measurements shows good agreement for turbine and compressor cascades.
- Fluid Mechanics
- Hydraulic and Pneumatic Equipment