Viscous-inviscid interaction analysis of incompressible cascade flows

Abstract

The aerodynamic performance of turbomachines is limited by flutter, choking, and stall, the last of which being a topic of this report. Viscous flow considerations are not only essential in determining loss coefficients, but also in ascertaining loadings and in providing a fundamental understanding of the flow. However, because of the complexity' of flows in turbomachines flow problems of model character only are accessible to uumerical treatment. The focus of this report is on steady, incompressible, viscous. 2-d flows through a single infinite row of equidistant blades. In order to compute these cascade flows Prandtl's boundary layer concept enhanced by a strong interaction model is applied to the Navier-Stokes equations. Since this approach enables the integration of boundary layer equations in the presence of backflow. it is an attractive alternative to much more expensive Navier-Stokes solvers...