Investigation of ignition and flame propagation in an axisymmetric supersonic combustor with laser-induced plasma

超音速 燃烧室 机械 物理 点火系统 空腔壁 预混火焰 马赫数 超燃冲压发动机 旋转对称性 燃烧 材料科学 光学 化学 复合材料 热力学 有机化学
作者
Qinyuan Li,Jiajian Zhu,Yifu Tian,Mingbo Sun,Minggang Wan,Bo Yan,Tiangang Luo,Yongchao Sun,Chao Wang,Tao Tang,Hongbo Wang
出处
期刊:Physics of Fluids [American Institute of Physics]
卷期号:35 (12) 被引量:15
标识
DOI:10.1063/5.0170239
摘要

The ignition and flame propagation in an axisymmetric supersonic combustor were investigated. The laser-induced plasma was employed to ignite the supersonic inflow with a speed of Mach 2.5 and a total temperature of 1486 K. A direct-connect axisymmetric model scramjet with a fully transparent glass combustor was built, which enabled the circumferential and axial flame propagation in the cavity-based axisymmetric supersonic combustor to be visualized by the high-speed photography from the endoscopic and external views, respectively. An initial flame kernel is produced by the laser-induced plasma and propagates to the cavity leading edge along the axial direction. The establishment of the cavity shear-layer flame facilitates circumferential flame propagation. The circumferential flame propagation is coupled with the axial propagation, eventually generating a loop-shaped flame with a central-hole. Acceleration of the flame propagation can be observed, especially when the global equivalence ratio is increased. A plausible explanation for the flame propagation in the axisymmetric supersonic combustor was found using URANS numerical simulation. The axisymmetric cavity generates a low-speed loop-shaped recirculation region and thickened cavity shear-layer with an appropriate local equivalence ratio, resulting in the simultaneous axial and circumferential flame propagation. The increased temperature in the cavity and the thickened cavity shear-layer during the flame propagation produce a more intense heat release and mass transfer, leading to faster flame propagation.
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