Simulation research on flow field characteristics of atomizing nozzle by circular seam air impact
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摘要: 分析了一种环缝气流冲击雾化制粉喷嘴的结构和工作原理, 并对该雾化喷嘴模型进行了流场分布数值仿真, 研究了不同进气压力和窄缝倾角对流场速度分布的影响。研究结果表明, 从进气管入口到气流冲击雾化喷嘴出口, 加速气流速度保持最大值不变, 在距进气管入口中心线上80 mm位置之后逐渐减小; 随着进气压力的增加, 气流冲击雾化喷嘴出口速度表现出明显的增加趋势, 且仿真结果与理论计算结果误差在10%范围以内。随着窄缝倾角的增加, 负压涡流逐步向进粉管靠近, 回流区、分离区和混合区的最大速度值表现出单调增加的变化规律; 综合考虑气流冲击效果和喷射速度, 确定最优的窄缝倾角50°~60°。Abstract: The structure and working principle of atomizing nozzle by circular seam air impact were analyzed, the numerical simulation model on flow field distribution of atomizing nozzle was studied, and the effects of inlet pressure and circular seam inclination on velocity distribution in flow field were investigated. The results show that, the acceleration of air velocity remains unchanged from the inlet of intake pipe to the exit of air impact atomizing nozzle, and the maximum is achieved at 80 mm away from the center line of intake pipe inlet. With the increasing of inlet pressure, the exit velocity of air impact atomizing nozzle shows an increasing trend obviously, and the error between simulation results and theoretical calculation result is within 10%. With the increasing of circular seam inclination, the negative pressure eddy current is gradually closed to the import of powder tube, the maximum velocity in backflow zone, separation zone, and mixed zone increases monotonously. Considering the air impact effect and jet velocity, the optimal circular seam inclination is determined as 50°~60°.
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Key words:
- powder atomization /
- nozzle /
- circular seam airflow /
- flow field characteristics /
- numerical simulation
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图 1 环缝气流冲击雾化制粉喷嘴结构图
Figure 1. Structure of atomizing nozzle by circular seam air impact
图 2 环缝气流冲击雾化喷嘴计算区域及边界类型
Figure 2. Calculation region and boundary of atomizing nozzle by circular seam air impact
图 3 喷嘴内部流场速度分布(a)及速度矢量(b)
Figure 3. Velocity distribution in flow field of atomizing nozzle (a) and velocity vector (b)
图 5 流场速度在不同窄缝倾角下的分布云图: (a) 30°; (b) 55°; (c) 80°
Figure 5. Velocity distribution in flow field of atomizing nozzle at different circular seam inclination: (a) 30°; (b) 55°; (c) 80°
表 1 不同进气压力下喷嘴出口速度
Table 1. Exit velocity of atomizing nozzle in different inlet pressure
进气压力/ MPa 喷嘴出口速度/ (m·s-1) 仿真结果 理论计算结果 4 23.4 22.2 6 28.6 26.8 8 34.2 31.5 10 36.8 33.6 
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表 2 雾化喷嘴不同区域最大速度随窄缝倾角的变化结果
Table 2. Maximum velocity in different zone at different circular seam inclination of atomizing nozzle
窄缝倾角/ (°) 最大速度/ (m·s-1) 涡流区 回流区 分离区 混合区 30 55.4 29.6 25.8 25.0 35 55.2 31.2 27.9 26.9 40 55.2 33.5 31.8 29.8 45 55.7 34.9 33.1 30.1 50 55.1 36.0 34.2 31.2 55 55.3 37.1 35.0 33.3 60 55.6 38.2 35.8 34.2 65 54.8 41.8 36.6 35.8 70 54.5 43.4 36.9 36.1 75 55.1 43.8 37.1 36.6 80 53.8 44.3 37.5 36.9 85 54.6 45.2 37.9 37.1
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