Abstract
The effects on acoustic characteristics of nozzle type and location on a wing for STOL engine over-the-wing configurations are assessed at full scale and equal aerodynamic performance. Three types of nozzle configurations are evaluated: a circular nozzle with external deflector mounted above the wing, a slot nozzle with external deflector mounted on the wing and a slot nozzle mounted on the wing. Nozzle locations with respect to the wing leading edge were varied from 10% to 46% (flaps retracted) with flap angles of 20° (takeoff mode) and 60° (approach mode). Data of PNL as a function of flyover distance at 500 ft are presented for all cases. From these plots, relative values of EPNL were calculated and plotted as a function of lift and thrust ratios. From such plots the acoustic benefits attributable to variations in nozzle/deflector/wing geometry at full scale are assessed for equal aerodynamic performance.
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