Sound propagation in a wind tunnel: Comparison of experiments with FFP and residue solution

Abstract

Several models and solutions have been developed for propagation in the presence of refraction and ground of finite impedance. These include the fast field program (FFP) and the residue solution. In this paper, the results obtained with these theories are compared with scale model sound propagation experiments performed in a wind tunnel. The data are obtained in the presence of relatively steep wind speed profiles which have stable gradients and provide a good test for the theories. In addition, a single procedure to approximate realistic profiles by an equivalent linear profile is discussed.