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Enhancement of ethylene-air continuous rotating detonation in the cavity-based annular combustor

机译：增强腔室环形燃烧器中的乙烯 - 空气连续旋转爆轰

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To investigate enhancement effects of cavity on continuous rotating detonation (CRD), extensive ethyleneair CRD tests are conducted in the cavity-based annular combustor. By varying the length-to-depth ratio (L/D) of cavity, five modes are distinguished and classified into three operating zones, I: Excessive Impact (deflagration and sawtooth wave); II: Proper Impact (single wave and co-rotating two-wave); III: Deficient Impact (counter-rotating two-wave). In the cavities with small L/D in zone I, excessive deflagration could inhibit the accumulation of combustible mixture, making detonation degenerate into deflagration. While the cavities with proper L/D in zone II could intensify CRD, resulting in a propagation mode transformation from counter-rotating two-wave to co-rotating mode. The added circumferential contact surface between the cavity-stabilized flame and combustible mixture is a key factor of cavity enhancement, which can pre-heat combustible mixture and reduce the detonation inducing time. Through the distribution of chemiluminescence intensity ratio, the intensity ratio peaks of deflagration and detonation are estimated to be in 40-50 mm and 20-30 mm downstream from the inlet respectively, indicating that detonation with proper cavities is accomplished in shorter distance. Overall, L/D=5.5 with the depth of 20 mm may be an optimized selection based on the evaluations of mode, reaction zone, and pressure. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：为了研究腔体在连续旋转爆轰（CRD）上的增强效果，在基于腔的环形燃烧器中进行广泛的乙基乙基CRD测试。通过改变腔的长度到深度比（L / D），将五种模式区分并分为三种操作区，I：影响过度影响（燃烧和锯齿波）; II：适当的影响（单波和共旋转两波）; III：缺乏影响（反向旋转两波）。在区域I中具有小L / D的空腔中，过度的透明液体可以抑制可燃混合物的积累，使爆炸退化为净化。当区域II中具有适当L / D的腔可能会强化CRD，导致CRD的传播模式变换从反向旋转两波到共旋转模式。腔稳定的火焰和可燃混合物之间的附加的圆周接触表面是腔内增强的关键因子，其可以预热可燃混合物并减少爆炸诱导时间。通过化学发光强度比的分布，净化和爆炸的强度比峰值分别估计在入口下游40-50mm和20-30mm，表明在较短的距离内完成具有适当腔的爆炸。总体而言，L / D = 5.5深度为20 mm，可以是基于模式，反应区和压力的评估的优化选择。 （c）2021 Elsevier Masson SAS。版权所有。

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