Transient Airloads on a Body of Revolution Due to Indicial Sinking at a Large Angle of Attack

摘要

A nonlinear method is proposed for predicting the airloads on a slender, pointed body of revolution due to indicial sinking at a large angle of attack at supersonic or low hypersonic speeds. The method is an extension of Miles (NAVORD 2052) linearized theory for a slender, pointed body achieved by incorporating the Bryson theory of the indicial drag of a circular cylinder for the transient cross-flow drag on the body. Comparisons of the steadystate theory are made with wind-tunnel data to indicate the range of Mach number, angle of attack, and fineness ratio over which the method could be expected to be applicable. It is found that the method is most useful for predicting the airloads on the cylindrical portion of the body, where vortices have the largest effect on the flow. (Author)