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首页> 外文期刊>Aerospace science and technology >Investigation of flame flashback phenomenon in a supersonic crossflow with ethylene injection upstream of cavity flameholder
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Investigation of flame flashback phenomenon in a supersonic crossflow with ethylene injection upstream of cavity flameholder

机译：在腔扑壁夹上乙烯注射的超声横向流中的火焰闪回现象研究

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摘要

In the present study, a flame flashback phenomenon inside an ethylene-fuelled scramjet combustor equipped with a cavity flameholder is investigated under flight Mach 5.5 condition. Experimental results exhibit the quasi-periodic combustion oscillation between the fuel injectors and the leading edge of the cavity under a specified condition. As an indispensable key sub-process of combustion oscillation, the flame flashback from the boundary layer downstream of the cavity is responsible for unsteady combustion process in scramjet combustors. Numerical simulation has been carried out in the specified condition. Attributed by (i) thicker boundary layer, (ii) closer thermal disturbance and (iii) improved local mixing degree, the flame flashback phenomenon can be induced by thermal throat which is generated by interaction between separated boundary layer and intense combustion. Quantitative analysis also indicates that the flame flashing is more sensitive to temperature fluctuation downstream of the cavity. In addition, a simplified combustion opening system model has been established to analyse combustion oscillation mechanisms, which theoretically demonstrates that the three factors mentioned above can destroy the balance of heat release and dissipation, causing the system cannot self-stabilise once certain temperature fluctuation thresholds in sensitive areas are exceeded. At the same time, the auto-ignition model excludes the possibility of flame flashback generated by auto-ignition effect. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：在本研究中，在飞行马赫5.5条件下，研究了配备有腔体载体的乙烯燃料炒浆燃烧器内的火焰闪回现象。实验结果表明了在特定条件下燃料喷射器和腔的前缘之间的准周期性燃烧振荡。作为燃烧振荡的不可或缺的关键子过程，来自空腔下游边界层的火焰闪回是扰燃器中的不稳定燃烧过程。数值模拟已在指定条件下进行。由（i）较厚的边界层（II）较近的热干扰和（iii）改善局部混合程度，火焰闪回现象可以通过热喉部诱导，热喉部通过分离边界层与强燃烧之间的相互作用产生。定量分析还表明火焰闪烁对腔下游的温度波动更敏感。此外，已经建立了一种简化的燃烧开口系统模型来分析燃烧振荡机制，理论上表明上述三种因素可以破坏热释放和耗散的平衡，导致系统不能自稳定一旦某些温度波动阈值超过敏感区域。同时，自动点火模型不包括自动点火效果生成的火焰闪回的可能性。 （c）2019年Elsevier Masson SAS。版权所有。

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