Abstract
An experimental investigation was conducted on n generic jet-lift STOVL (short take-off and vertical landing) aircraft in transitional flight, out of ground effect. The tests were carried out in an open-jet wind tunnel and t,he model was equipped with a single, variable position, vectored lift-jet and ‘powered’ intakes. Static pressure measurements were made on the wing and intake lips from which airloads mere inferred. The effect of jet to intake mass flow ratio on jet/intake aerodynamic interactions was investigated. The experiments conclude that a mutual interference exists between the jet and intake flows which generates non-linearly-additive loads on the airframe. The combined jetand intakeinduced interference on the wing increased with increasing jet to intake mass flow ratio. Ignoring jet/intake interference effects gave a consistently lower overall wing root lift loss which was equivalent to up to 0.75 degrees of incidence. Nomenclature JSF Joint Strike Fighter NPR P, nozzle pressure r&i0 _L i 1 PO RMCS Royal Military College of Science STOVL short take-off vertical landing A, throat area of one intake [0.002] (in’)
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