Abstract The cavity flameholder is the most efficient way for the mixing of the fuel through the supersonic combustion tank. In current article, the impact of the extended strut in the upstream of the chamber flame holder on the mixing efficiency of fuel is comprehensively scrutinized. The present work investigated the hydrogen distribution of the multi-jets in different directions. CFD method is applied for the simulation of the multi-fuel jet at the supersonic free stream with Ma = 4. The effects of free-stream Ma and length of the extended strut on the fuel distribution are also demonstrated. The structure of the fuel jets and air stream entrain to the cavity in various conditions are studied. According to our results, the mixing zone of counter multi jets is larger than co multi-jets. Our outcomes reveal that the extension of the strut to half of the cavity declines the power of the main circulation, and subsequently, the mixing zone is limited. Furthermore, increasing the free-stream Mach intensifies the wake behind the strut, and this enriches the fuel mixing inside the cavity.

中文翻译：

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通过带有扩展塔架的腔式火焰稳定器的多氢射流混合增强

摘要 腔式火焰稳定器是通过超音速燃烧罐进行燃料混合的最有效方式。本文综合考察了燃烧室火焰稳定器上游加长支柱对燃料混合效率的影响。目前的工作研究了多射流在不同方向上的氢分布。应用 CFD 方法模拟 Ma = 4 的超音速自由流下的多燃料射流。还演示了自由流 Ma 和延长支柱长度对燃料分布的影响。研究了在各种条件下燃料射流和空气流进入空腔的结构。根据我们的结果，反多射流的混合区大于共多射流。我们的结果表明，支柱延伸到腔体的一半会降低主循环的功率，随后，混合区受到限制。此外，增加自由流马赫数会加强支柱后面的尾流，从而丰富腔内的燃料混合。