中文摘要：

通过数值模拟方法研究了圆管内湍流气体和压力旋流雾化喷嘴产生的液滴群的掺混规律。定义了掺混度、不均匀浓度因子和无量纲颗粒浓度定量评价掺混水平，根据这些特征参数，获得了掺混度曲线和截面等浓度线。分析了不同水气比、喷嘴雾化角度和颗粒直径情况下颗粒群对横向气流的影响以及气相对颗粒群掺混过程的作用。结果表明：颗粒群的加入使气相产生了尺度不同的涡，促进了气相湍流发展；近喷雾区，大尺度的涡造成了颗粒局部浓度较高，掺混度较低，但是经过较短的距离就能充分掺混，此时掺混度值较高，同时初始的喷雾形态和壁面处的较大速度梯度使得颗粒存在趋壁现象；水气比1：1、中等雾化角度90°和较大的颗粒更有利于掺混。

英文摘要：

The mixing characteristics of spray droplets in the turbulent gas crossflow in a horizontal tube were numerically studied. The droplets were produced by the pressure swirl nozzles which were evenly mounted in the same cross section of the tube. Three parameters including the degree of mixedness, uneven concentration factor and non-dimensional particle concentration were proposed to assess the mixing effect. The curves of both degree of mixedness and uneven concentration factor along the crossflow and isoconcentration lines in different cross sections were plotted. The inter-impact of the crossflow and droplets under different conditions involving water/gas mass flow ratio, spray angle and droplet diameter were analyzed. The results show that different-scale eddies are generated due to the adding of droplets into the crossflow, leading to the increase of turbulence intensity. The droplets in the cross sections near the nozzles distribute unevenly due to the big eddies, which results in low degree of mixedness. However, the degree of mixedness increases rapidly along the crossflow and reaches a stable value at short distance from the nozzles. Meanwhile, the droplets tend to congregate in the near-wall region due to both the initial spray configuration and the tendency of particles＇ congregating in high strain and low vortex regions. A better mixing result can be obtained with water/gas mass flow ratio of 1：1, moderate spray angle of 90° and bigger droplet diameter.