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The spatial growth of supersonic reacting mixing layers: Effects of combustion mode

机译：超音速反应混合层的空间生长：燃烧模式的影响

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Supersonic mixing layer flows are taken in scramjet engines for enhancing mixing and combustion efficiency. The spatial growth of supersonic reacting mixing layers with streams of dilute hydrogen and air has been investigated using direct numerical simulation, with detailed chemical reaction mechanisms. Different inlet air temperatures are considered to trigger auto-ignition of mixtures in mixing layers with Damkohler numbers ranged. By the comparison of auto-ignition sites and vortex shedding positions in the computational domain, four modes are classified as incombustible, premixed combustion, diffusion combustion after premixed one, and diffusion combustion. The spatial growth of supersonic reacting mixing layers, characterized by the vorticity thickness, along the streamwise direction establishes a strong relationship with the combustion mode. For the premixed combustion mode the growth rate increases compared to inert case, but it decreases for the diffusion combustion mode. The difference of combustion mode implies that the spatial growth has to be viewed section by section rather than previous one as a whole. The premixed combustion with strong heat-release within the shear layer causes much dilatation, while the diffusion combustion with relatively weak heat-release suppresses entrainment of the shear interface to an extent so that offsets dilatation influences. These findings provide a new perspective for supersonic reacting mixing layers applied to scramjet engines. (C) 2021 The Author(s). Published by Elsevier Masson SAS.
机译：超声波混合层流量在Scramjet发动机中拍摄，以提高混合和燃烧效率。使用直接数值模拟研究了具有稀氢气流的超音速反应混合层的空间生长，具有直接数值模拟，具有详细的化学反应机理。不同的入口空气温度被认为是触发混合层中混合的混合物的自动点火。通过对计算领域的自动点火站点和涡旋脱落位置的比较，四种模式被分类为预混合后的不可燃，预混燃烧，扩散燃烧，并扩散燃烧。超声反应混合层的空间生长，其特征在于涡流厚度，沿着流动方向与燃烧模式建立了强大的关系。对于预混合的燃烧模式，与惰性情况相比，生长速率增加，但是扩散燃烧模式下降。燃烧模式的差异意味着必须通过部分而不是作为整体的部分来观看空间增长。预混合燃烧具有剪切层内的强热释放引起的膨胀性很大，而具有相对较弱的热释放的扩散燃烧抑制了剪切界面的夹带，以便抵消扩张影响。这些发现提供了一种新的超声波反应混合层的新视角，其应用于扰刺发动机。 （c）2021提交人。由Elsevier Masson SA出版。

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