Investigations on flame liftoff characteristics in liquid-kerosene fueled supersonic combustor equipped with thin strut
Investigations on flame liftoff characteristics in liquid-kerosene fueled supersonic combustor equipped with thin strut
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液体煤油燃料超音速薄支柱燃烧室火焰升空特性研究
DOI：
10.1016/j.ast.2018.11.017
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发表时间：
2019-01
影响因子：
5.6
通讯作者：
Bao Wen
中科院分区：
文献类型：
--
作者：
Zhang Junlong;Chang Juntao;Ma Jicheng;Wang Youyin;Bao Wen
采用数值模拟和实验相结合的方法，研究了以液体煤油为燃料的超声速燃烧室中的离壁和附着火焰特性。在燃烧室中心安装了一个细支杆，起到火焰保持器的作用，同时也起到了燃油喷射的作用。在实验和数值模拟条件下，燃烧室进口马赫数为2.8，驻点温度为1680 K，压力为1.87MPa。实验过程中的火焰图像由高速摄像机拍摄，摄像参数为8000帧/秒，压力传感器也记录了燃烧室的压力分布。结果表明，火焰结构可分为火焰离地和火焰附着两种状态，当量比和等离子体点火器均会对火焰状态产生影响。通过分析数值模拟得到的流场特性，探讨了火焰抬离现象的形成机理，火焰状态取决于燃料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。发现了不同当量比变化路径下火焰离地距离的滞后现象，并探讨了路径响应特性。本文的研究结果有助于深入了解超燃冲压发动机薄支板燃烧室的传播过程，揭示其燃烧稳定机理。
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.
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