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该文对甲烷-空气湍流平面射流预混火焰进行了直接数值模拟。射流入口的扰动速度数据依据给定的湍流能谱生成,利用入口处的湍流积分长度尺度和湍动能确定了能谱的峰值波数。计算结果给出了气体温度、质量分数和涡量模的瞬态分布,表明在剪切层内随着旋涡尺度的增大出现了拟序结构。化学反应受到湍流的作用,瞬时反应面出现了明显的皱折,反应面积增大。沿射流中心线,湍动能逐渐衰减,温度脉动和甲烷质量分数脉动均方根值则逐渐增大。
The paper directly simulates the premixed flame of methane-air turbulent planar jet. The perturbation velocity data at the jet inlet was generated based on a given turbulence spectrum. The turbulent integral length scale and turbulent kinetic energy at the inlet were used to determine the peak wavenumber of the energy spectrum. The calculated results give the transient distributions of gas temperature, mass fraction and vorticity mode, indicating that the structure appears as the vortex scale increases in the shear layer. The chemical reaction was turbulent, the instantaneous reaction surface appeared obvious wrinkles, the reaction area increases. Along the jet centerline, the turbulent kinetic energy gradually decays, and the rms values of temperature pulsation and methane pulsation gradually increase.