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Effects of Annular Combustor Width on the Ethylene-Air Continuous Rotating Detonation
International Journal of Aerospace Engineering ( IF 1.4 ) Pub Date : 2020-09-14 , DOI: 10.1155/2020/8863691
Weijie Fan 1 , Shijie Liu 1 , Jin Zhou 1 , Haoyang Peng 1 , Siyuan Huang 1
Affiliation  

The realization and stable operation of Continuous Rotating Detonation (CRD) in the annular combustor fueled by hydrocarbon-air are still challenging. For further investigation of this issue, a series of ethylene-air CRD tests with the variation of combustor width is conducted, and the effects of combustor width are well analyzed based on high-frequency pressure and high-speed photograph images. The results show that the combustor width plays a significant role in the realization and sustainability of the ethylene-air CRD. In this paper, the critical combustor width for the CRD realization and stable single wave are 20 mm and 25 mm, respectively. In wide combustors, the backward-facing step at the combustor forepart makes the main flow slow down, and thus, the mixing quality is promoted. Besides, the pilot flame at the recirculation zone contributes to sustaining the CRD wave. As the width increases, the propagation mode changes from counter-rotating two-wave mode to single wave mode with higher propagation velocity and stability. The highest propagation velocity reaches 1325.56 m/s in the 40 mm wide combustor, accounting for 71.51% of the corresponding Chapman-Jouguet velocity. Despite large combustor volume, high combustor pressure is obtained in detonation combustion mode indicating that a better propulsive performance could be achieved by CRD.

中文翻译:

环形燃烧室宽度对乙烯-空气连续旋转爆轰的影响

在以碳氢化合物空气为燃料的环形燃烧室中,实现连续旋转爆震(CRD)并使其稳定运行仍是充满挑战的。为了进一步研究该问题,进行了一系列随着燃烧器宽度变化的乙烯-空气CRD测试,并基于高频压力和高速照片图像很好地分析了燃烧器宽度的影响。结果表明,燃烧室宽度在乙烯-空气CRD的实现和可持续性中起着重要作用。在本文中,实现CRD和稳定单波的临界燃烧器宽度分别为20 mm和25 mm。在宽燃烧器中,燃烧器前部的向后步骤使主流速度减慢,从而提高了混合质量。除了,再循环区的引燃火焰有助于维持CRD波。随着宽度增加,传播模式从反向旋转的两波模式变为具有更高的传播速度和稳定性的单波模式。在40 mm宽的燃烧器中,最高传播速度达到了1325.56 m / s,占相应的Chapman-Jouguet速度的71.51%。尽管燃烧室容积很大,但在爆炸燃烧模式下仍可获得较高的燃烧室压力,这表明CRD可以实现更好的推进性能。对应的Chapman-Jouguet速度的51%。尽管燃烧室容积很大,但在爆炸燃烧模式下仍可获得较高的燃烧室压力,这表明CRD可以实现更好的推进性能。对应的Chapman-Jouguet速度的51%。尽管燃烧室容积很大,但在爆炸燃烧模式下仍可获得较高的燃烧室压力,这表明CRD可以实现更好的推进性能。
更新日期:2020-09-22
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