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SMALL-SCALE EXPERIMENTS IN STOVL GROUND EFFECTS

1990; Linguagem: Inglês

10.4271/901060

2688-3627

V. R. Corsiglia, Douglas A. Wardwell, Richard E. Kuhn,

Fluid Dynamics and Turbulent Flows

Pi local static pressure A series of tests has been completed in which Pjet suckdown and fountain forces and pressures were measured on circular plates and twin-tandem-jet AM generic STOVL (short takeoff and vertical landing) configurations.The tests were conducted using a Ap small-scale hover rig, for jet pressure ratios up to 6 and jet temperatures up to 700 °F.The measured suckdown force on a circular plate with a central jet S was greater than that found with a commonly used empidcal prediction method.The present data T showed better agreement with other sets of data.The tests of the generic STOVL configurations were conducted to provide tome and pressure data with a parametric variation of parameters so that an empirical prediction method could be developed.The effects of jet pressure ratio and temperature T were found to be small.Lift improvement devices were shown to substantially reduce the net suckdown forces.total pressure at jet exit jet induced pitching moment local pressure difference; _P = Pi-Pamb model planform area thrust, T = 7.0 A( Pamb)[(NPR 0.286) -1], NPR < 1.893 T = A(Pamb)[(1.2679)NPR-1 ], NPR > 1.893 jet temperature