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SECONDARY GAS INJECTION IN A CONICAL ROCKET NOZZLE. 1. EFFECT OF ORIFICE DIAMETER AND MOLECULAR WEIGHT IN INJECTANT
JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
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Data are presented on interference forces resulting when a gas at ambient temperature is laterally injected through a single circular orifice in the conical portion of a rocket nozzle into hot supersonic propellent gases. Variables examined are injectant orifice size and associated pressure ratio change and effect of injectant molecular weight and specific heat ratio. Other parameters remain essentially constant during these tests. Simple theoretical arguments can predict relative effects of intrinsic injectant properties, but pressure ratio effects are not adequately described. Effectiveness of secondary injection depends on injectant orifice size, which was not treated in any theoretical modes.
APPROVED FOR PUBLIC RELEASE