An Experimental Investigation by Force and Surface Pressure Measurements of a Wing Immersed in a Propeller Slipstream. Part Ii. Surface Pressure Measurements

摘要

Measurements of wing surface pressures were made in the NAE 6-ft x 9-ft low speed wind tunnel for wings immersed in a propeller slipstream. Three wing semispan configurations were tested with different flap deflections and propeller thrust coefficients. Representative data are presented to illustrate the chordwise pressure distributions, the spanwise load distributions and the overall wing-force coefficients. The pressure distributions indicate strong influence of slipstream rotation on the wing loading. Because of the slipstream detachment from the wing surface at high angles of attack and low thrust, the results show the importance of the longitudinal and vertical positioning of the propeller. Comparison of integrated pressure measurements with balance measurements, after subtraction of isolated propeller forces, showed good agreement. (Author)