New Methods for Predicting Nonlinear Lift, Center of Pressure, and Pitching Moment on Missile Configurations.

摘要

A new semiempirical method has been developed to predict normal force, pitching moment, and center of pressure on missile configurations up to angles of attack of 30 deg . The new method is based on linear theory and slender body techniques at low angle of attack and uses wind tunnel data to derive nonlinear angle-of-attack corrections as angle of attack increases. The new improved theories include body alone, wing alone, and body-wing and wing-body interference. While the new theory is databased, simple analytical formulas are derived that allow general use of the techniques. Comparison of the new theory to the linearized approaches used in the former NSWCDD aeroprediction code shows significant reductions in errors of aerodynamics dynamics above about 5 deg to 10 deg angle of attack. Limited comparisons of the new theory to other state-of-the-art engineering codes show the new theory to be as good as or better than anything known to be available computing planar aerodynamics up to 30 deg angle of attack. nonlinear lift, pitching moment, center of pressure. slender body theory, linear theory.