中文摘要：

通过数值仿真试验研究，验证利用FLUENT仿真软件进行数值仿真的可行性，并且得出在单相流以及气为连续相的低含液率气液两相流这两种情况下，50mm口径涡街流量计探头的相对最佳安装位置，其中单相流的涡街探头最佳安装位置在发生体后O．4D处，气为连续相的低含液率气液两相流涡街探头的最佳安装位置在发生体后1D处。利用FLUENT仿真软件的后处理功能对流场进行分析，得出低含液率下采集的信号在发生体后1D处最优的本质原因——在发生体后1D处，旋涡达到成熟，涡街信号最强，流场信息最为丰富稳定。以含液率0．04％的气液两相流流场与单相流流场进行对比，分析得出单相流和低含液率两种情况下，涡街探头最佳安装位置不同的原因。

英文摘要：

By numerical simulation and experimental research, the feasibility of the numerical simulation by the FLUENT software is proved, and the optimal installation location of the vortex flowmeter probe in the two cases of single-phase flow and the gas-liquid two-phase flow with low liquid fraction is got, for the single-phase flow, the optimal installation location of the probe is the 0.4D behind the bluff body, and for the gas-liquid two-phase flow, the optimal installation location of the probe is 1D behind the bluff body, and the reason why 1D behind the bluff body is the optimal location is got through analyzing the flow distribution with the post processing function of the FLUENT software： in 1D behind the bluff body, the vortex becomes maturity, the signal strength is the strongest and the information of the flow field is the most abundant and stable. By comparing the flow field of the single-phase and the gas-liquid two-phase flow with 0.04% liquid fraction, the reason why these two conditions have different installation locations is got..