Experimental study on the influence of conical struts on the mode transition of kerosene-fueled round combustor

Abstract

Aiming at the dual-mode round combustor model of kerosene fuel, the combustor mode transition test under different conical strut choking ratios was carried out. The monotonicity, sensitivity and stability of the wall pressure as a controlled parameter are analyzed, and the variation law of the mode transition boundary and the choking ratio of the conical strut is studied. The research indicated that at Δx = 30 mm downstream of the kerosene injector, the wall pressure exhibited good monotonicity, high sensitivity, and relatively good stability, making it most suitable as the controlled parameter for fuel flow rate. When the choking ratio was 0.00, 0.22, and 0.26, the equivalent ratios corresponding to the mode transition boundaries were 0.667, 0.64, and 0.51, respectively. As the choking ratio of the conical strut increased, the equivalent ratio corresponding to the mode transition boundary decreased. The variation curves of the corrected wall pressure ratio and equivalent ratio at Δx = 30 mm and Δx = 60 mm downstream of the kerosene injector also exhibited an approximate parallel relationship, with the mode transition boundary corresponding to corrected wall pressure ratios of 0.0278 and 0.028, respectively.