GUST ALLEVIATION STUDY PART Ⅲ. PREDICTION OF THE ALLEVIATION OF GUST LOAD ON ARIGID RESTRAINED WING UTILIZING WING INSTALLED ALLEVIATIOR DEVICES

摘要

This is the third part of a three=part report presenting the results of an investigation made to determine the feasibi1ity of using wing installed aerodynamic devices for gust alleviation. In this part the percent alleviations of a sharp-edged and one-minus-cosine gust loads on rigid, restrained wings have been cal¬culated using trai ling-edge flaps, mechanical spoilers, air-jet spoilers, and streamwise slots as alleviator devices. Frequency response results also were obtained for the wing gust loads using a sinusoidal gust and for the flap and spoiler counter loads. The relative power requirements of each a 1leviator device considered were estimated. On the basis of the results obtained, mechanical spoilers and the trai1ing-edge flaps were rated as feasible con¬trols to be used in gust load alleviation, the air-jet spoilers were rated questionable due to the excessive power requirements indicated, and the streamwise slots were rated questionable due to their relatively low and uncertain aerodynamic effectiveness.