Autoignition and detonation characteristics of n-heptane/air mixture with water droplets
Autoignition and detonation characteristics of n-heptane/air mixture with water droplets
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正庚烷/空气与水滴混合物的自燃和爆轰特性
DOI：
10.1016/j.fuel.2020.117077
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发表时间：
2020-04
期刊：
影响因子：
7.4
通讯作者：
Huangwei Zhang
中科院分区：
文献类型：
--
作者：
Yijie Zhuang;Qiang Li;Peng Dai;Huangwei Zhang
本文研究了一维受限反应器中正庚烷/空气混合物的自燃和爆轰特性。气液两相的欧拉-欧拉方程被用来模拟多组分、完全可压缩和反应性的多相流。通过对一系列液滴直径和数密度的参数研究，了解了不同气相燃烧条件下气相反应前沿的发展和液滴蒸发特性。在反应器中的自燃行为的四种模式被确定，他们被发现在很大程度上取决于液滴直径和数密度。当液滴直径和数密度较小时，爆轰由热点引发，但在右边界处不发生自燃。当两者或其中之一增加时，自燃发生在右边界，反应锋可能进一步演化为爆轰波或爆燃波。这是因为该区域中的温度不均匀性显著增强。此外，液滴直径和数密度被用来量化的自燃和爆轰发展的不同模式。对于反应前沿发展过程中的液滴蒸发动力学，观察到各种机制，与由两相之间的速度差（其特征在于液滴雷诺数），高的局部气体压力和液滴温度主导的不同效果有关。这导致反应器中液滴蒸发速率的非单调空间分布，例如在引爆或冲击区域中的M形。
The present study addresses the autoignition and detonation characteristics ofn-heptane/air mixture with water droplets in a confined one-dimensional reactor. A Eulerian-Eulerian formulation for gas and liquid phases is employed to simulate multi-component, fully compressible and reactive multi-phase flows. The parametric investigations covering a range of droplet diameters and number densities are conducted to understand the reaction front development in gas phase and droplet evaporation characteristics under different gaseous combustion conditions. Four modes of autoignition behaviours in the reactor are identified and they are found to greatly depend on both droplet diameter and number density. At a relatively small droplet diameter and/or number density, detonation is initiated by hot spot but no autoignition occurs at the right boundary. When both or either of them increase, autoignition occurs at the right boundary and the reaction front may further evolve into detonative or deflagrative waves. This is because the temperature inhomogeneity in that region is considerably enhanced. Furthermore, droplet diameter and number density are used to quantify the different modes of autoignition and detonation development. For the droplet evaporation dynamics during the reactive front development process, various mechanisms are observed, related to the different effects dominated by the velocity difference between two phases (characterized by the droplet Reynolds number), high local gas pressure and also the droplet temperature. This results in non-monotonic spatial distributions of droplet evaporation rate in the reactor, e.g.M-shaped in the detonated or shocked regions.
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