期刊
APPLIED THERMAL ENGINEERING
卷 236, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2023.121527
关键词
Scramjet combustor; Mixing efficiency; Strut flame holder; Fuel transport; Large-eddy simulation
This study investigates the fuel injection strategy and the effect of supplemental oxygen on the mixing performance in a scramjet combustor through large eddy simulations. The results show that injecting fuel from the upstream nozzle enhances mixing efficiency compared to the downstream nozzle. Additionally, supplementing oxygen at the trailing edge of the strut significantly improves turbulence and enhances fuel and oxidizer mixing.
The combustor is the core component of the scramjet. The mixing of fuel and oxidizer is an important prerequisite for the efficient operation of the combustor. A thin strut configuration with supplemental oxygen at the trailing edge is proposed to enhance the mixing of fuel and oxidizer. In this paper, a series of large eddy simulations are carried out at the combustor inlet conditions of Ma = 2.8, Tt = 1680 K, and Pt = 1.87 MPa to optimize the fuel injection strategy and clarify how supplementation oxygen affects the mixing performance. The results show that injecting fuel from the upstream nozzle will form a more complex flow separation region and a stronger vortex, and increase the mixing efficiency from 0.18 to 0.26 compared with the downstream nozzle. The diffusion of fuel interacts strongly with vortexes. A unique separation zone was observed near the upstream nozzle for the first time. Compared with a single nozzle of fuel injection, the coordinated injection of two nozzles can increase the dimensionless fuel penetration depth by 30%. Supplementing oxygen at the trailing edge of the strut can significantly increase the turbulence to generate a variety of vortices and enhance the mixing of fuel and oxidizer, and the mixing efficiency can be increased by more than 20%.
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