Abstract:

Based on Eulerian-Lagrangian coupling model，the performance of fan-shaped air-blast atomizer was simulated. The results showed that along with the increasing of gas-liquid mass flow ratio，Sauter Mean Diameter （SMD）decreased firstly，and after reaching the minimum value （39.5 μm），it began to increase. When the gas-liquid mass flow ratio was 23%，the droplets located at 20 mm from the atomizer were restricted to the field ranging from －20 mm to 20 mm in the fan-shaped direction，and the spatial droplet concentration distribution and velocity distribution were in bimodal distribution，with the maximal value occurring on the edge of  the fan-shaped field（Y=15 mm，Y=－15 mm）. The droplet diameter mostly ranged from 15 μm to 50 μm，the peak value and SMD were 25 μm and 45.2 μm，respectively.

摘要：

采用Eulerian-Lagrangian耦合模型，对内混式空气雾化喷嘴性能进行了数值模拟，模拟结果表明：索特尔平均直径随气液质量流量比的增加，先逐渐减小，达到极小值后，又逐渐增大，SMD的极小值约为39.5 μm；当气液质量流量比为23%时，距离喷嘴出口20 mm处液滴基本被气流束缚在扇形平面方向上±20 mm的范围内，液滴浓度和速度分布呈“双峰型”分布，最大值出现在“扇形”喷雾区域的边缘处（Y=15 mm和Y=－15 mm）；绝大部分液滴粒径在15～50 μm，峰值约为25 μm，索特尔平均直径为45.2 μm。