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首页> 外文期刊>Acta astronautica >Implication of geometrical configuration of cavity on combustion performance in a strut-based scramjet combustor
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Implication of geometrical configuration of cavity on combustion performance in a strut-based scramjet combustor

机译：腔腔几何配置对基于支柱的乱形燃烧室燃烧性能的影响

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摘要

The present work describes the numerical investigation on the implication of the geometrical configuration of a cavity with a strut-based scramjet combustor. Firstly, the combustion characteristics of a combustor with a cavity and the combustor without a cavity are compared and evaluated to portray the effect of a cavity. On the other hand, a separate study is performed to investigate the interplay of cavity parameters namely, length to depth (L/D) ratio of a cavity and angle of a cavity (alpha) on the performance of a strut-based scramjet combustor. Our study reveals the formation of a strong recirculation zone in the cavity region which improves the mixing and combustion efficiency in the case of a cavity-based combustor. It is observed that the combustion commences relatively earlier in the case of a cavity-based combustor and reaches to its peak value of around 80%. Further, the size of a recirculation region depends on the distance between the strut injector and the length of a cavity. Moreover, the shear layer is observed in the cavity region inducing a weak shock at the trailing edge of a cavity which deteriorates the performance of a scramjet combustor particularly for a higher angle of a cavity(a) and lowers L/D ratio of a cavity. Also, the combustion efficiency is found to be optimal with moderate pressure losses at L/D = 4 and alpha = 30(0).
机译：本作者描述了基于支柱的扰燃器的腔几何构造的含义的数值研究。首先，比较燃烧器的燃烧特性和没有腔的腔体的燃烧器和燃烧器，以描绘腔的效果。另一方面，进行单独的研究以研究腔参数的相互作用，即，腔体（α）的腔体和角度的长度（L / D）比在基于支柱的碎屑燃烧器的性能上。我们的研究表明，在腔区域中形成强的再循环区域，其在基于腔的燃烧器的情况下提高了混合和燃烧效率。观察到燃烧在基于腔的燃烧器的情况下相对较早地开始，并且达到其峰值约为80％。此外，再循环区域的尺寸取决于支柱喷射器之间的距离和腔的长度。此外，在腔区域中观察剪切层，在腔的腔区域诱导腔的后缘弱冲击，这使得瘙痒燃烧器的性能劣化，特别是对于腔（a）的更高角度，并且降低了腔的L / D比率。此外，发现燃烧效率在L / D = 4和α= 30（0）下以适度的压力损失是最佳的。

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