Abstract 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 H2 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 H2 injection. The perforated holes dissipate high-pressure spots, and thereby suppress the acoustic modes.

中文翻译：

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穿孔壁旋转爆震燃烧室的实验研究

摘要 穿孔壁有可能应用于旋转爆轰燃烧器 (RDC) 以稳定燃烧和进行蒸腾冷却。本研究首次对穿孔壁燃烧器中的旋转爆轰进行了实验研究。对具有不同孔径和穿孔面积比（范围从 0 到 3.5%）的五种类型的墙壁进行了检查，以分析声学和燃烧特性以及 RDC 的性能。实验中同时观察到稳定和不稳定旋转爆震，不稳定现象主要对应于与燃烧室声模共存的反双波旋转爆震。面积比超过1.75%的穿孔壁有效抑制了声模，旋转爆轰稳定性显着提高。穿孔壁显着削弱了测得的爆轰压力峰值并减轻了旋转爆轰对 H2 增压室的影响，而它们并没有明显降低比冲。提出声波模式是由两个爆震波碰撞产生的局部高压点激发的，它们通过影响 H2 注入引起波动的压力峰值和波速。穿孔消散高压点，从而抑制声模式。它们通过影响 H2 注入引起波动的压力峰值和波速。穿孔消散高压点，从而抑制声模式。它们通过影响 H2 注入引起波动的压力峰值和波速。穿孔消散高压点，从而抑制声模式。