Studies on the Gust Response of a Wing : Part 1. Response of a Two-Dimensional Rigid Wing

Abstract

In this report the response characteristics of a two-dimensional, rigid wing (NACA-0012) to the gusts are investigated. The gusts treated here are the normal gusts which vary normal to the main flow sinusoidally and randomly. In the case of sinusoidal gust, the experimental results show that the absolute value of lift variations are less than those of Sears' function and phase differences are large. In the analyses the thickness effects of airfoil sections are particularly investigated. In the case of random gust, the generalized harmonic analyses are applied. The frequency transfer functions of lift have the different inclination from those of Sears' function in experimental results. From the power spectral function of circulations the frequency transfer function of lift is obtained analytically and the difference between the experimental results and the calculated ones are discussed.