Fuel Blending as a Means to Achieve Initiation in a Rotating Detonation Engine
Fuel Blending as a Means to Achieve Initiation in a Rotating Detonation Engine
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DOI：
10.2514/6.2015-0633
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发表时间：
2015-01
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影响因子：
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通讯作者：
A. S. George;R. Driscoll;V. Anand;D. Munday;E. Gutmark
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文献类型：
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作者：
A. S. George;R. Driscoll;V. Anand;D. Munday;E. Gutmark
提出了一种在旋转爆震发动机（RDE）中实现碳氢-空气混合物爆轰起爆的燃料掺混技术。在辛辛那提大学爆震发动机试验设备上进行了一项试验研究，以证明燃料逐渐过渡对建立不易引爆碳氢化合物的旋转爆震的有效性。基线乙烯的可操作性由于存在强烈的低频不稳定性而受到阻碍，通常导致爆震的迅速失败。氢-乙烯燃料混合物的研究没有显示出扩大的起燃范围，但确实产生了显著增强的爆震稳定性和改善的从与不稳定性相关的熄火事件的恢复。从氢辅助状态转变到乙烯-空气混合物的尝试受到在不存在氢的情况下立即开始的不稳定性的阻碍。由于ZND分析预测了本研究中探索的氢分数范围的有限化学效应，因此氢添加的稳定机制可能是物理的而不是化学的，并且可能是由于抑制燃料增压室反馈。
A fuel blending technique is proposed to achieve detonation initiation of hydrocarbon-air mixtures in a rotating detonation engine (RDE). An experimental investigation is performed at the University of Cincinnati Detonation Engine Test Facility to demonstrate the efficacy of gradual fuel transition to establish rotating detonation for less detonable hydrocarbons. Baseline ethylene operability is hindered by the existence of strong, low frequency instability, generally resulting in prompt failure of the detonation. An investigation of hydrogen-ethylene fuel blends does not exhibit an expanded lightoff range, but does yield significantly augmented detonation stability and improved recovery from extinction events related to the instability. Attempts to transition from a hydrogen-assisted state to an ethylene-air mixture are hindered by the immediate onset of instability in the absence of hydrogen. As the ZND analysis predicts a limited chemical effect for the range of hydrogen fractions explored in this study, the stabilizing mechanism of hydrogen addition may be physical rather than chemical, and is possibly due to suppression of fuel plenum feedback.