AN EXPERIMENTAL AND THEORETICAL INVESTIGATION OF TWO-DIMENSIONAL JET-FLAP AERODYNAMIC INTERACTION AT SUPERSONIC SPEEDS.
JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB
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Two-dimensional jet flap aerodynamic interaction tests were conducted in the 8 in. x 13 in. supersonic tunnel at Mach number 3.97 and Reynolds number 120,000 per inch. The test model consisted of a wedge of rectangular planform equipped with side plates and a full span jet slot. The primary data taken were jet mass flow, normal force increment due to the jet, and schlieren photographs. The specific impulse ratios obtained varied from 3.6 at the lowest jet force parameter to 2.5 at the highest jet force parameter. Jet force parameter is defined as the jet stagnation pressure times jet slot width, divided by free-stream pressure times body length. For the range of variables covered in the present experiment the jet force parameter was found to govern the flow geometry, including transition in the separated shear layer. Data on aerodynamic interaction in the case of the approximately two-dimensional, sonic jet flap have been collected from four sources. The available data for specific impulse ratio were correlated, mostly within plus or minus 10, over a hundredfold range of a dimensionless parameter consisting of the jet force parameter multiplied by a free stream Mach number function. An inviscid theory was developed to provide an analytical justification for the dependence on the parameter. Author
- Fluid Mechanics