On the explosion characteristics for central and end-wall ignition in hydrogen-air mixtures: A comparative study
On the explosion characteristics for central and end-wall ignition in hydrogen-air mixtures: A comparative study
复制标题
氢气-空气混合物中心点火和端壁点火爆炸特性的比较研究
DOI：
10.1016/j.ijhydene.2021.06.213
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发表时间：
2021-08-19
影响因子：
7.2
通讯作者：
Liu, Hong
中科院分区：
文献类型：
--
作者：
Dai, Tingkai;Zhang, Bo;Liu, Hong
为了研究不同点火位置对氢-空气混合物爆炸特性的影响，在定容球形容器中进行了湍流和静态条件下的中心和端壁点火实验。根据爆炸超压曲线，测定了爆炸时间τ（e）、最大爆炸压力上升速率（dp/dt）（max）和最大爆炸压力p（max）等3个爆炸特性。实验结果表明，在静态条件下，中心点火的爆炸危险性普遍大于端壁点火。在较低的初始压力下，两种点火情况之间的差异较大。结果表明，中心点火时能量损失较小，爆炸行为与理想定容爆炸相似。而端壁点火时，超声速冲击波与冷却粗糙壁的相互作用消耗了大量的爆炸能量。在湍流条件下，射流压力p（jet）和射流时间T-jet的增加导致湍流强度和持续时间的增加，增强了中心点火的爆炸危险性，但抑制了端壁点火的爆炸过程。随着p（jet）和T-jet的增大，两种点火位置的差异增大。(C)2021年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
To demonstrate the influence of different ignition positions on the explosion characteristics of H-2-Air mixtures, a series of experiments at central and end-wall ignition under turbulent and quiescent conditions are carried out in a constant volume spherical container. Three explosion characteristics including explosion time tau(e), maximum explosion pressure rise rate (dp/dt)(max), and maximum explosion pressure p(max) are measured and derived from the explosion overpressure curve. The experimental results demonstrate that the explosion hazard with the central ignition is generally stronger than that with the end-wall ignition under quiescent conditions. At lower initial pressure, the difference between two ignition cases is greater. The results show that for central ignition, the energy loss is small, and the explosion behavior is similar to the ideal constant volume explosion. While for end-wall ignition, the interaction between supersonic blast wave and cooling rough wall consumes a large amount of explosive energy. Under turbulent conditions, the increase of the jet pressure p(jet) and the jet time T-jet leads to the increase of turbulence intensity and duration, which enhances the explosion hazard of central ignition, but restrains the explosion process of end-wall ignition. The difference between the two ignition locations increases with the increase of p(jet) and T-jet. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.