GUST ALLEVIAATION STUDY PART I. ESTIMATION OF THE CONTROL DERIVATIVES FOR FLAPS, SPOILERS, AND OTHER CONTROL DEVICES INTENDED FOR USE AS GUST ALLEVIATIORS

摘要

This is the first part of a three-part report presenting the results of an investigation made to determine the feasibil¬ity of using wing installed aerodynamic devices for gust allevia-tion. In this part, the areodynamic characteristics of wing-mounted control devices which might be used for gust alleviation have been investigated. Of the controls given preliminary con¬sideration, only trailing-edge flaps, mechanical spoilers, air-jet spoilers, and stream wise wing slots were sufficiently promising to warrant detailed examination. The characteristics estimated included the static lift, pitching-moment, drag, and downwash derivatives with respect to control operation, and the control indicial lift responses, which include the aerodynamic lag effects. The aerodynamic and geometric variables investigated included Mach number, aspect ratio, taper ratio, sweepback, span-wise location, Chordwise location, thickness ratio, and trailing-edge angle. The predicted lift and pitching moment coefficients are compared to the experimentally determined values presented in Part H of this report.