Experimental study on dynamic characteristics of wall pressure in supersonic combustor of kerosene fuel

Abstract

Abstract In order to study the rationality and feasibility of kerosene-fueled supersonic combustor wall pressure as the controlled parameter of scramjet, a series of supersonic combustor ground direct-connected tests were carried out on the ground direct-connected test bench of Northwestern Polytechnical University. The test simulated the actual process of ignition and combustion in a double-cavities supersonic combustor under the conditions of inlet total pressure of 800 kPa and 900 kPa, total temperature of 810 K, and Mach number 2.0. The characteristics of pressure distribution and sensitivity on the wall of the combustor were measured and analyzed. The results show that the combustor wall pressure fluctuates obviously in steady state, and the fluctuation is positively correlated with the oil-gas ratio. The relative variation of wall pressure difference value and equivalent oil-gas ratio can reflect the sensitivity of wall pressure change under different oil-gas ratios. The wall sensitivity at X=370 mm is the largest, which is most suitable as the controlled parameter of the engine kerosene flow.