Prediction of Helicopter Free Flight Trim Using a State of the Art Analytical Model

摘要

To aid in the design and analysis of rotors, a reliable and efficient code of aircraft aerodynamics is required. With such a code, expensive flight test time may be optimized. A reliable code also allows the engineer to determine the relationship between full scale wind tunnel tests and free flight. In this report, the research code CAMRAD, Comprehensive Analytical Model of Rotocraft Aerodynamics and Dynamics, is investigated to determine if it can be relied upon to construct a free flight test matrix for the prototype Boeing Vertol Helicopter Model 360. Excellent correlation was found between CAMRAD'S wind tunnel analysis and testing data on the Model 360 in the Duits-Nederlandse Windtunnel (DNW) for forward flight conditions from the DNW. The free flight analysis on CAMRAD compared well to theoretical helicopter aerodynamics. A free flight test matrix was constructed from the CAMRAD simulation. Keywords: Helicopters; Aerodynamics; Numerical analysis. (SDW)