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首页> 外文期刊>Aerospace science and technology >Investigations on flame liftoff characteristics in liquid-kerosene fueled supersonic combustor equipped with thin strut
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Investigations on flame liftoff characteristics in liquid-kerosene fueled supersonic combustor equipped with thin strut

机译：装有细支柱的液体煤油燃料超音速燃烧器的火焰升空特性研究

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The flame characteristics of liftoff and attachment in supersonic combustor fueled with liquid kerosene were investigated by the methods of numerical simulation and experiment. A thin strut was equipped in the center of the combustor acting as the flame holder, and the function of fuel injection was also achieved by the thin strut. In the experimental and numerical conditions, the Mach number in the inlet of the combustor is 2.8, with the stagnation state of T-t = 1680 K, P-t = 1.87 MPa. The flame images during the experiment process are captured by high speed camera, with the camera parameter of 8000 frames per second, and the pressure distributions in the combustor are also recorded by the pressure sensors. Results show that the flame structure could be divided into two statuses, namely flame liftoff status and flame attachment status, and both the equivalence ratio and the plasma jet ignitor could make an influence on the flame status. By analyzing the flow field characteristics obtained by numerical simulation, the formation mechanism of the flame liftoff phenomenon is discussed, and the flame status depends on both the fuel premixed process and flame propagation characteristics. Further, to investigate the influence of equivalence ratio on the flame liftoff characteristic, an experiment with a linearly increasing equivalence ratio from 0.3 to 0.76 is conducted. The hysteresis of flame liftoff distance is found in different equivalence ratio changing paths, and the path response characteristics are probed. The conclusions of this article is helpful for having an understanding of propagation process and revealing the combustion stabilization mechanism in the thin strut-equipped scramjet combustor. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：通过数值模拟和实验的方法，研究了液体煤油燃料在超声速燃烧器中升空和附着的火焰特性。在燃烧器的中心装有薄支柱作为火焰保持器，并且通过薄支柱也实现了燃料喷射的功能。在实验和数值条件下，燃烧器入口处的马赫数为2.8，停滞状态为T-t = 1680 K，P-t = 1.87 MPa。实验过程中的火焰图像由高速摄像机捕获，摄像机参数为每秒8000帧，并且燃烧室中的压力分布也由压力传感器记录。结果表明，火焰结构可分为火焰剥离状态和火焰附着状态两种状态，当量比和等离子喷射点火器均可影响火焰状态。通过对数值模拟得到的流场特性进行分析，探讨了火焰剥离现象的形成机理，火焰状态取决于燃料的预混过程和火焰传播特性。此外，为了研究当量比对火焰剥离特性的影响，进行了当量比从0.3线性增加到0.76的实验。在不同的当量比变化路径中发现了火焰上升距离的滞后现象，并探究了路径响应特性。本文的结论有助于了解传播过程，并揭示配备薄撑杆的超燃冲压燃烧器的燃烧稳定机理。 （C）2018 Elsevier Masson SAS。版权所有。

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