APPROXIMATE METHOD FOR DETERMINING THE POTENTIAL FLOW ABOUT AN ARBITRARY AEROFOIL SECTION IN A TWO-DIMENSIONAL FINITE STREAM WITH PARTICULAR REFERENCE TO LARGE STREAM DEFLECTIONS

摘要

The flow about and on the surface of an aerofoil section in a finite stream and that about and on the surface of the same aerofoil section in an infinite symmetrical cas?cade are compared; it is shown that, for most cases of practi?cal interest, the differences are small for stream deflection angles up to 90 degrees. Thus, the approximate flow about an arbitrary aerofoil section in a two-dimensional finite stream may be obtained by using the methods existing for the determination of the flow about an arbitrary section in a cascade. The procedure, as applied to the finite stream approximation, is given using the interference method of cascade theory.