Turbulence influence on explosion characteristics of stoichiometric and rich hydrogen/air mixtures in a spherical closed vessel
Turbulence influence on explosion characteristics of stoichiometric and rich hydrogen/air mixtures in a spherical closed vessel
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球形密闭容器内湍流对化学计量富氢/空气混合物爆炸特性的影响
DOI：
10.1016/j.enconman.2017.07.051
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发表时间：
2017-10
影响因子：
10.4
通讯作者：
Li Guo Xiu
中科院分区：
文献类型：
--
作者：
Sun Zuo Yu;Li Guo Xiu
爆炸往往发生在湍流环境中，但目前针对湍流对爆炸特性影响的研究较少。本文在爆炸压力示踪的基础上，实验研究和分析了初始湍流对化学计量比浓氢-空气混合物爆炸特性的影响。系统地研究了最大爆炸压力、爆炸持续时间、最大压力升高率、快速爆炸持续时间、爆燃指数和爆炸过程中通过壁面的平均热流密度。结果表明，湍流会降低对应的当量比和最大压力升高率，但不会改变对应的当量比和最大爆炸压力和两个爆炸持续时间。在湍流环境中，由于压力波的加速传播，两次爆炸持续时间会缩短，最大爆炸压力和最大压力升高率会因爆炸时通过容器壁面的热流减少而升高。此外，湍流还提高了爆燃指数的值，即提高了危险程度。
Explosion always occur in turbulent ambience, but few researches focusing on the effects of turbulence on explosion characteristics has been performed in the current. In the present investigation, the effects of initial turbulence on the explosion characteristics of stoichiometric and rich hydrogen-air mixtures were experimentally studied and analyzed on the basis of explosion pressure traces. Maximum explosion pressure, explosion duration, maximum rate of pressure rise, fast explosion duration, deflagration index, and the averaged heat flux through the wall during explosion were systematically examined. The results indicated that, turbulence will reduced the corresponding equivalence ratio to maximum rate of pressure rise but won’t change the corresponding equivalence ratios to maximum explosion pressure and two explosion durations. In turbulent ambience, two explosion durations will decline for the accelerated propagation of pressure wave, the values of maximum explosion pressure and maximum rate of pressure rise will be raised for the reduced heat flux through the vessel’s wall during explosion. In addition, turbulence raises the value of deflagration index, namely it raises the hazardous level.
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作者：
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通讯作者：
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