中文摘要：

对空间发展的气固两相圆湍射流进行了双向耦合的大涡模拟,采用对拖拽力源项扰动进行频谱分析的方法揭示了大小颗粒对气相湍流不同调制规律的物理机制。结果表明：大颗粒的拖拽力源项扰动具有较强的低频特征,其与上游区域以大尺度涡为特征的气相低频特征一致,从而强化了气相湍流,而小颗粒却类似无特征频率的噪声,难以与气相脉动特征发生正向耦合而弱化了气相湍流。

英文摘要：

Two-way coupling large eddy simulation of a spatially developing gas-particle round jet is carried out to study the turbulence modulation. The spectrum analysis is adopted for the spectrum characteristics of time-series drag sources. It shown that the spectrum of drag source for large particles has an low characteristic frequency which is similar to the characteristic frequency of gas phase in the upstream region, and the gas turbulence is therefore enhanced. The drag source for small particles without characteristic frequency is unable to couple with the gas-phase flow.