Investigation on the detonation propagation limit criterion for methane-oxygen mixtures in tubes with different scales
Investigation on the detonation propagation limit criterion for methane-oxygen mixtures in tubes with different scales
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不同尺度管内甲烷-氧气混合物爆轰传播极限准则的研究
DOI：
10.1016/j.fuel.2018.11.062
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发表时间：
2019-03
期刊：
影响因子：
7.4
通讯作者：
Yan Bingjian
中科院分区：
文献类型：
--
作者：
Zhang Bo;Liu Hong;Yan Bingjian
研究了φ= 0.25-2的CH 4-O2混合气在直径为36 mm的大通道和高度为2 mm、4.5 mm和7 mm的微通道中的爆轰传播极限。实验测量了不同通道中每种混合物的临界压力（pc），低于临界压力时爆轰不能维持稳定传播。在临界压力条件下，分析了爆轰波胞尺寸（λ）与管道尺寸（DH）之间的比例关系，从宏观和微观两个方面探讨了通道内爆轰失效的机理。实验结果表明，对于不稳定性较大的混合物，爆轰传播极限判据λ= πD（D为内径）在宏观通道内成立，但随着混合物向富油状态发展，爆轰不稳定性降低，这一典型关系被打破。结果表明，爆轰波在宏观通道中的传播极限准则与管道边界条件的关系较小，而与爆轰波的不稳定性关系较大。在微通道中，由于壁面损失和边界层质量扩散，爆轰波在较窄的通道中传播，速度差（VD）较大，从而增加了反应区长度和爆轰波胞尺寸;因此，λ= π D不适合作为爆轰传播极限的判据，这表明对于微通道中的爆轰传播，传播机制主要由边界条件控制。
The detonation propagation limits of CH4-O2mixtures (φ= 0.25–2) in a macro-channel (D= 36 mm) and in micro-channels with heights of 2 mm, 4.5 mm and 7 mm were studied. The critical pressure (pc) below which detonation cannot maintain steady propagation was measured experimentally for each mixture in different channels. At the condition ofpc, the scaling between detonation cell size (λ) and tube dimension (DH) were also analyzed to explore the detonation failure mechanism in channels of macro- and micro-scale. The experimental results show that the detonation propagation limit criterionλ= πD(Dis the inner diameter) holds in a macro-channel for the mixture with larger value of instability; however, the detonation instability is reduced as the mixture tends to fuel-rich condition, where this typical relation breaks down. The results indicate that the propagation limit criterion in macro-channel depends less on the boundary conditions of the tube and more on the detonation instability. In the micro-channels, because of the losses from the walls and mass divergence into the boundary layers, detonation propagates in a thinner channel with larger velocity deficit (VD), thereby increasing both the reaction zone length and the detonation cell size; therefore,λ= πDis unsuitable as a criterion of the detonation propagation limit, which suggests that for detonation propagating in the micro-channels, the propagation mechanism is mainly governed by the boundary conditions.
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