Flow field characteristics analysis and combustion modes classification for a strut/cavity dual-mode combustor
Flow field characteristics analysis and combustion modes classification for a strut/cavity dual-mode combustor
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支柱/腔体双模式燃烧室流场特性分析及燃烧模式分类
DOI：
10.1016/j.actaastro.2017.03.023
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发表时间：
2017-08
影响因子：
3.5
通讯作者：
Bao Wen
中科院分区：
文献类型：
--
作者：
Zhang Chenlin;Chang Juntao;Zhang Yuanshi;Wang Youyin;Bao Wen
本文对支柱/腔体双模燃烧室进行了实验和数值研究。在不同的燃料当量比和分配比例条件下，燃烧室的压力分布和流场结构呈现出明显的特点。对于低当量比喷油，光度图像显示燃烧区分布在支杆后的剪切层中。支撑前的壁面燃油喷射将改变压力上升的起点。根据流场结构，将双模式燃烧室工作过程分为超燃冲压模式、弱冲压模式和强冲压模式三种模式。由于激波与边界层的强相互作用，弱冲压发动机模式比超燃冲压发动机模式具有更强的隔离体压缩效应和更高的燃烧效率。随着热释放的增加，热喉部的形成是强冲压发动机模式的标志，该模式在隔离器上有一个亚音速间隙。此外，通过判断支柱前的主导压力传感器的压力，可以对三种不同的燃烧模式进行分类。对比燃烧室的比冲，在不同的燃烧模式下有明显的差异。
Experimental and numerical study of a strut/cavity dual-mode combustor has been conducted in this paper. Under different fuel equivalence ratio and allocation proportion conditions, the pressure distribution and flow field structure of combustor show distinct characteristics. For strut fuel injecting at a low equivalence ratio, the luminosity images show that combustion zone distributes in the shear layer behind the strut. The wall fuel injecting before strut would change the starting point of pressure rising. Based on the flow field structure, the dual-mode combustor operation process is classified into three combustion modes, including scramjet mode, weak ramjet mode and strong ramjet mode. Because of a strong interaction of the shock wave with the boundary layer, weak ramjet mode has a stronger isolator compression effect and higher combustion efficiency than scramjet mode. With heat release increasing, the thermal throat formation is an indication of the strong ramjet mode, which has a subsonic gap in the isolator. Further, by judging the pressure from dominant pressure sensor before the strut, the three different combustion modes could be classified. Comparing the specific impulse of combustor, it has an obvious distinction in the different combustion modes.
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