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该文对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各向同性衰变湍流的能谱生成,研究了扰动数据周期的选取对模拟结果的影响。表明当入口扰动数据的周期大于总的计算时间时,得到的不同时刻的瞬态模拟结果有较明显的差异,并得到了时均定常的气体平均温度、速度和组分浓度分布。而当扰动数据周期小于总的计算时间时,入口扰动数据的周期性会对模拟结果产生影响,导致瞬态结果出现周期性。
In this paper, the direct numerical simulation of turbulent planar jet premixed flame is carried out. The perturbation velocity data of the jet inlet is generated according to the energy spectrum of the isotropic decay turbulence, and the influence of the period of perturbation data on the simulation results is studied. It shows that when the period of entrance disturbance data is more than the total calculation time, the transient simulation results obtained at different times have obvious differences, and the mean temperature, velocity and component concentration distribution of gas with constant time are obtained. However, when the perturbation data period is less than the total computation time, the periodicity of the entrance perturbation data will have an impact on the simulation results, resulting in the periodicity of the transient results.