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针对激光诱导氧气火花的演化过程,建立了二维轴对称、非定常、多组分计算模型,在流体力学基本方程组的基础上考虑化学反应动力学,并用Fluent软件进行求解,得到了氧气火花在不同时刻的压力和温度分布,分析了氧气火花演化过程中流动传热过程的一些特点,并拟合得到了冲击波半径随时间的变化关系。通过计算结果与文献结果对比,进一步阐明了激光诱导氧气火花演化过程的动理学机理,为激光诱导气体火花点火的应用奠定了基础。
Aiming at the evolution process of laser-induced oxygen sparks, a two-dimensional axisymmetric, unsteady and multi-component calculation model was established. Based on the fundamental equations of fluid mechanics, the chemical reaction kinetics was considered and solved by Fluent software. At different times of pressure and temperature distribution, some characteristics of flow and heat transfer during oxygen spark evolution are analyzed, and the variation of shock wave radius with time is fitted. By comparing the calculated results with those of the literature, the kinetic mechanism of laser induced oxygen spark evolution is further clarified, which lays the foundation for the application of laser induced gas spark ignition.