Combustion of Vaporized Kerosene in Supersonic Model Combustors with Dislocated Dual Cavities

Abstract

Supersonic combustion of vaporized kerosene in a Mach 2.5 model combustor with a total temperature of 1500 K and a total pressure of 1.3 MPa was experimentally investigated for an optimal integration of the cavity-based flameholder and the fuel injection scheme. A novel design of a supersonic model combustor consisting of a two-staged fuel injection system and dislocated dual cavities was proposed to improve the combustor performance, including the combustion efficiency, flame stabilization, combustor "unstart," and heat release distribution. Specifically, a large number of experiments were performed to systematically investigate the effects of fuel injection distribution, which is controlled by varying the injector spacing and the fuel equivalence ratio, on the static pressure distribution, thrust increment, lean blowout limit, wall temperature distribution, and combustor unstart characteristics. The results show that there exists an optimal range of injector spacing to obtain enhanced combustion performance while avoiding the combustion unstart. Furthermore, the equal fuel injection with an overall equivalence ratio of 0.5 for the two injectors was found to result in the optimal static pressure distribution and hence the largest thrust increment.

Study on Flame Stabilization in a Dual-Mode Combustor Using Optical Measurements

“…All experiments in the present work were conducted in a Ma 2.5 direct-connect wind tunnel, which consists of a vitiated air supply system, multipurpose supersonic model combustor [14][15][16], and simultaneous pulsed schlieren and CH chemiluminescence system. The vitiated air, which is supplied by burning hydrogen in air with oxygen replenishment, has a stagnation temperature of 700-2200 K and a stagnation pressure of 0.6-4.5 MPa.…”

Numerical simulation on ignition transients of hydrogen flame in a supersonic combustor with dual-cavity

“…Pan et al [10] implemented experiments to compare the ignition and flameholding ability between different types of dualcavity, and found that intersected cavities installation lead to improved performance while tandem cavities installed too closer was not beneficial for ignition and flame stabilization. A similar experimental study was conducted in dislocated dual cavities with a longer distance [11]. In addition, a study by Wang [12] indicated that tandem cavities enlarge the recirculation zone and achieve much better mixing but need an accurate cooperation with injection schemes to be efficient.…”

Experimental investigation of combustion stabilization modes in a cavity-based supersonic combustor with different wall divergence angles

“…Zhang et al. 23 experimentally investigated the combustion of vaporized kerosene in supersonic combustors with dislocated dual cavities for optimal integration of the cavity-based flame holder and fuel injection scheme. The results showed that there existed an optimal range of injector spacing to obtain enhanced combustion performance while avoiding the combustion unstart.…”