INVESTIGATION OF VERTICAL DRAG AND-PERIODIC AIRLOADS ACTING ON FLAT PANELS IN A ROTOR SLIPSTREAM

摘要

Tests have been conducted on the Langley helicopter test tower to determine the vertical drag and pressure distributions acting on flat panels mounted normal to the rotor slipstream. The panels were tested with semi spans of a rotor radius and of one-half a rotor radius at positions from 0.05 to 0.64 of a rotor radius beneath the plane of zero flapping.nCalculations of the vertical drag by use of a strip-analysis procedure outlined in this paper and the assumption of a fully contracted wake agreed well with the experimental results over the range from 0.20 to 0.64 rotor radius beneath the plane of zero flapping.