A finite-difference method is described which is capable of computing fully nonlinear transonic cascade flows using a rectangular mesh. Jameson's rotated difference scheme is applied to the full potential equation, and and a procedure is given for uniquely specifying the potential at certain 'dummy' points in the blade interior so as to satisfy the hard-wall boundary conditions. Results from this program for a low-solidity cascade of thin blades show good agreement with those from a transonic small-disturbance code for isolated airfoils. Sample calculations are presented for a high-solidity cascade of very thick, highly cambered blades at speeds ranging from incompressible through the transonic supercritical regime. This simple method has several advantages over more sophisticated analyses in that it facilitates extension to three dimensions, minimizes smearing of any shocks that may occur, and could be readily cincorporated as part of the NASA cascade codes now in widespread use. (DePo)
A rectangular-coordinate method for calculating nonlinear transonic potential flowfields in compressor cascades
Rechteck-Koordinatenverfahren fuer die Berechnung nichtlinearer, transsonischer potentieller Stroemungsfelder in einer Verdichterkaskade
AIAA-Papers ; 1-13
1978
13 Seiten, 11 Bilder, 1 Tabelle, 39 Quellen
Conference paper
English