吴韶华, 张 健. 入口扰动数据周期对湍流预混射流火焰直接模拟的影响[J]. 工程力学, 2013, 30(1): 45-51. DOI: 10.6052/j.issn.1000-4750.2011.06.0404
引用本文: 吴韶华, 张 健. 入口扰动数据周期对湍流预混射流火焰直接模拟的影响[J]. 工程力学, 2013, 30(1): 45-51. DOI: 10.6052/j.issn.1000-4750.2011.06.0404
WU Shao-hua, ZHANG Jian. EFFECTS OF PERIOD OF THE INLET FLUCTUATING VELOCITY DATA ON THE DIRECT NUMERICAL SIMULATION OF TURBULENT PREMIXED JET FLAME[J]. Engineering Mechanics, 2013, 30(1): 45-51. DOI: 10.6052/j.issn.1000-4750.2011.06.0404
Citation: WU Shao-hua, ZHANG Jian. EFFECTS OF PERIOD OF THE INLET FLUCTUATING VELOCITY DATA ON THE DIRECT NUMERICAL SIMULATION OF TURBULENT PREMIXED JET FLAME[J]. Engineering Mechanics, 2013, 30(1): 45-51. DOI: 10.6052/j.issn.1000-4750.2011.06.0404

入口扰动数据周期对湍流预混射流火焰直接模拟的影响

EFFECTS OF PERIOD OF THE INLET FLUCTUATING VELOCITY DATA ON THE DIRECT NUMERICAL SIMULATION OF TURBULENT PREMIXED JET FLAME

  • 摘要: 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。

     

    Abstract: A direct numerical simulation of turbulent premixed planar jet flame is conducted. The fluctuating velocity field at the jet inflow boundary is generated based on the energy spectrum of isotropic decaying turbulence. The effects of the period of the fluctuating velocity data on the simulation results are investigated. When the period is larger than the total time for simulation, the computational instantaneous results at different times exhibit obvious differences. The time-averaged gas temperature, velocity, and species concentrations are obtained and they are in a steady state. While the period is less than the total time for simulation, the computational results are affected by the cyclic utilization of the inlet fluctuating velocity data. The periodicity appears in the instantaneous results.

     

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