According to the round jet flow condition,the computational fluid dynamics (CFD) model of the flow field is estab lished,and the numerical simulation of the flow characteristics of the turbulent jet external flow field is carried out by use CFD of finite element software ANSYS.By disturbing the boundary layer that was in a laminar state by exerting impulse micro-jet at the entrance of the external flow field,the simulation results were gotten.Then the variation characteristics of the external flow field were analyzed under the influence of radially micro-jet.The external flow field characteristics at different frequency of pulses were gotten under the changing conditions of the frequency of micro-jet.By contrast the results,the numerical simulation results of jet flow field have the same trend with the experimental result,and they are accord with the results of the previous experiments.%根据圆射流的射流条件建立了流场的CFD模型,并通过计算流体动力学的有限元软件ANSYS,对湍流射流外部流场流动特性进行了数值模拟.通过在外部流场入口处加入脉冲微射流,对原本处于层流状态的射流外层边界层进行扰动并得到模拟结果,从而分析在径向脉冲微射流的影响下,外部流场的变化特性.在改变微射流的脉冲频率的情况下,得到不同脉冲频率下的外部流场流动特性.通过对比,得到的射流流场数值模拟结果与实验结果趋势一致,并且与前人所得实验结果相吻合.
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