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Experimental study of perforated-wall rotating detonation combustors

机译：穿孔壁旋转爆轰燃烧器的实验研究

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Perforated walls are potentially applied in rotating detonation combustors (RDCs) to stabilize combustion and perform transpiration cooling. This study involves an experimental investigation on the rotating detonation in perforated-wall combustors for the first time. Five types of walls with different hole sizes and perforated area ratios that range from 0 to 3.5% are examined to analyze acoustics and combustion characteristics, and performance of the RDC. The stable and unstable rotating detonation are both observed in the experiments, and the unstable phenomena mainly correspond to the counter two-wave rotating detonation that co-exists with the acoustic modes of the combustor. The acoustic modes are effectively suppressed by the perforated wall with area ratios over 1.75%, and the stability of rotating detonation significantly improves. The perforated walls significantly weaken the measured detonation pressure peaks and mitigate the impact of rotating detonation on the H-2 plenum, while they do not evidently reduce the specific impulse. It is proposed that the acoustic modes are excited by local high-pressure spots generated by the collision of two detonation waves, and they induce the fluctuating pressure peaks and wave velocity by affecting the H-2 injection. The perforated holes dissipate high-pressure spots, and thereby suppress the acoustic modes. (C) 2019 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：穿孔壁可能施加在旋转爆轰燃烧器（RDC）中以稳定燃烧并执行蒸腾冷却。该研究涉及首次对穿孔壁燃烧器旋转爆轰的实验研究。检查具有0至3.5％的不同孔尺寸和穿孔区域比的五种类型的墙壁进行分析声学和燃烧特性，以及RDC的性能。在实验中观察到稳定和不稳定的旋转爆轰，并且不稳定的现象主要对应于与燃烧器的声学模式共存的反向两波旋转爆轰。通过面积比为175％的面积比有效地抑制了声学模式，旋转爆炸的稳定性显着改善。穿孔壁显着削弱了测量的爆轰压力峰值，并减轻了旋转爆轰对H-2增压室的影响，而它们并不明显降低特定的冲动。提出，声学模式通过由两个爆轰波的碰撞产生的局部高压点激发，并且它们通过影响H-2喷射来引起波动的压力峰值和波速。穿孔孔散发高压斑点，从而抑制声学模式。 （c）2019燃烧研究所。由elsevier Inc.出版的所有权利保留。

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