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Effects of Cavity Location on Ethylene–Air Continuous Rotating Detonation in a Cavity-based Annular Combustor
Combustion Science and Technology ( IF 1.9 ) Pub Date : 2020-05-14
Hao-Yang Peng, Wei-Dong Liu, Shi-Jie Liu, Hai-Long Zhang

To settle the realization difficulty of continuous rotating detonation (CRD) fueled by hydrocarbon, a cavity-based annular combustor scheme was proposed in our previous study, and its feasibility was well demonstrated. This paper mainly focuses on effects of the cavity location on CRD. The results show that the CRD operating range reduces, as the cavity moves downstream. When cavity is arranged in the detonation zone, the cavity-stabilized flame is coordinated with the reaction zone of detonation. The cavity can intensify the CRD initiation, and CRD waves propagate as co-rotating two-wave mode with higher outlet pressure, higher frequency, and higher stability. When cavity is downstream arranged out the detonation zone, it has little impact on improving the CRD initiation. CRD waves propagate as counter-rotating two-wave mode with lower outlet pressure, lower frequency, and poor stability. In these cases, the majority of reaction zone of detonation concentrates on the upstream annular part, and the cavity-stabilized flame is separated from the reaction zone of detonation, acting as afterburning. A new quantitative approach, the axial distribution of chemiluminescence intensity, has been proposed in this paper, and the separation and move processes of cavity-stabilized flame are verified quantitatively based on it.



中文翻译:

腔体位置对基于腔体的环形燃烧室中乙烯-空气连续旋转爆轰的影响

为了解决碳氢化合物燃料连续旋转爆轰(CRD)的实现困难,我们在先前的研究中提出了基于腔的环形燃烧器方案,并证明了其可行性。本文主要关注腔位置对CRD的影响。结果表明,随着腔向下游移动,CRD工作范围减小。当在爆轰区中设置空腔时,将稳定空腔的火焰与爆轰反应区配合。空腔可以增强CRD的引发,并且CRD波以同向旋转的两波模式传播,具有更高的出口压力,更高的频率和更高的稳定性。当空腔在爆轰区的下游布置时,对改善CRD引发几乎没有影响。CRD波以反向旋转的两波模式传播,出口压力较低,频率较低且稳定性较差。在这些情况下,爆炸的反应区大部分集中在上游环形部分上,腔稳定的火焰与爆炸的反应区分开,起到了后燃作用。提出了一种新的定量方法,化学发光强度的轴向分布,并在此基础上定量验证了腔稳定火焰的分离和运动过程。

更新日期:2020-05-14
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