Experiment on propagation characteristics of rotating detonation waves in different oxidizer inlet slots
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摘要:
为了揭示氧化剂环缝宽度对旋转爆震波传播特性的影响，在凹腔形旋转爆震燃烧室中，采用环缝-喷孔式喷注器，燃料和氧化剂分别为乙烯和氧气体积分数为50%的富氧空气，实验研究了氧化剂环缝宽度对旋转爆震波传播模态及传播特性的影响。结果表明：在不同氧化剂环缝宽度下，均成功实现了旋转爆震波的稳定传播，并观察到稳定爆震、周期性振荡和非周期性振荡3种模态；周期性振荡模态的当量比范围随着氧化剂环缝宽度的增加而扩大，且每个振荡周期包括爆震波解耦、缓燃波加速和爆震波形成3个过程；与稳定爆震模态相比，在两种振荡模态中，燃烧波的平均传播速度大幅降低且存在较大的速度波动。
Abstract:To investigate the propagation characteristics of rotating detonation waves in different oxidizer inlet slots, experimental study was performed in a cavity-based annular combustor. The slot-orifice impinging injection scheme was utilized. Ethylene and oxygen-enriched air with an oxygen volume fraction of 50% were used as fuel and oxidizer, respectively. The propagation modes and characteristics of the rotating detonation wave were discussed. Experimental results indicated that the rotating detonation waves can propagate steadily, and three propagation modes, i.e., stable detonation mode, periodic oscillation mode, and aperiodic oscillation mode, were observed in different oxidizer inlet slots. The equivalence ratio range of the periodic oscillation mode was expanded as the width of the oxidizer inlet slot increased, and each oscillation cycle included three processes, i.e., decoupling of detonation waves, acceleration of deflagration waves, and regeneration of detonation waves. The average velocity of the combustion waves in the two oscillation modes was significantly lower than that in the stable detonation mode, and there existed significant velocity variations.
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Key words:
- rotating detonation /
- oxidizer inlet slot width /
- propagation mode /
- propagation velocity /
- ethylene
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图 5 稳定爆震模态的传播速度分布
Figure 5. Propagation velocities distribution of the stable detonation mode
图 7 稳定爆震模态的起始过程压力波形
Figure 7. Pressure profiles of the initiation process measured at the stable detonation mode
图 8 周期性振荡模态的压力波形
Figure 8. Pressure profiles measured at the periodic oscillation mode
图 9 周期性振荡模态的传播速度分布
Figure 9. Propagation velocities distribution of the periodic oscillation mode
图 10 周期性振荡模态的STFT和FFT结果
Figure 10. STFT and FFT results of the periodic oscillation mode
图 11 周期性振荡模态的起始过程压力波形
Figure 11. Pressure profiles of the initiation process measured at the periodic oscillation mode
图 12 非周期性振荡模态的压力波形
Figure 12. Pressure profiles measured at the aperiodic oscillation mode
图 13 非周期性振荡模态的传播速度分布
Figure 13. Propagation velocities distribution of the aperiodic oscillation mode
图 14 非周期性振荡模态的STFT和FFT结果
Figure 14. STFT and FFT results of the aperiodic oscillation mode
图 15 非周期性振荡模态的起始过程压力波形
Figure 15. Pressure profiles of the initiation process measured at the aperiodic oscillation mode
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