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提出了超音速混合层着火距离的一种理论预测方法。基于超音速混合层来流热力学参数和考虑粘性加热及可压缩性效应的修正温度,定义了密闭容器反应系统。耦合详细化学反应机理获得该系统的着火延迟时间,并基于超音速混合层的平均流动速度获得了着火距离。其预测结果与高精度数值模拟结果相符,同时该理论预测方法能够从物理上很清晰地解释已有研究中所观察到的着火距离随相关影响因素的变化规律。同时,该预测方法为定性认识超音速着火距离及其变化规律提供了简易可行的途径,为耦合有限试验和数值模拟结果实现着火距离的定量预测提供了理论支撑。
A theoretical prediction method for the ignition distance of supersonic mixing layer is proposed. A closed vessel reaction system is defined based on the thermodynamic parameters of the flow in the supersonic mixing layer and the correction temperature considering the effects of viscous heating and compressibility. Coupling the detailed chemical reaction mechanism to obtain the ignition delay time of the system, and obtaining the ignition distance based on the average flow velocity of the supersonic mixing layer. The prediction results are consistent with the results of high-precision numerical simulation. At the same time, the theoretical prediction method can clearly explain the variation of fire distance observed in previous studies with the related factors. At the same time, the prediction method provides a simple and feasible approach for the qualitative recognition of the supersonic ignition distance and its variation, and provides theoretical support for the quantitative prediction of the fire distance in the coupled finite experiment and the numerical simulation.