【摘要】 应用湍流马赫数修正的非稳态可压缩性K ε f gr四方程湍流模型 ,模拟了半开口狭长管道中重复布置的障碍物引起的湍流火焰加速现象 .结果表明 ,障碍物产生的扰动对加强燃烧和湍流输运的影响很大 .随着火焰向前传播 ,火焰穿过障碍物时发生变形 ,反应区越来越长 ,且火焰速度逐渐上升 .同时 ,火焰速度和管内压力的计算结果与实验测量值吻合良好 .修正后的湍流模型能较真实地模拟障碍物管内预混火焰的发展过程更多还原

【Abstract】 The effect of Mach number of turbulent flow must be considered as the flame speed is near the sound speed or even supersonic in the obstructed tube. A numerical modelling study, using four-equation unsteady compressible flow turbulent model with turbulent Mach number correction,performed the turbulent flame acceleration in a semi-open tube with repeated obstacles. The results indicate that the turbulence produced by the obstructions has a dramatic influence on enhancement of combustion processes and turbulence transport. When the flame propagates along the tube, there exists distortion in the flame due to the obstacles, and the reaction regime becomes larger, resulting in acceleration of the flame. Furthermore, the comparison of predicted flame speeds and the overpressures with experimental data shows good agreement.更多还原