喷嘴组在变压力工况下雾化特性数值模拟  

Numerical Simulation of Atomization Characteristics of Nozzle Group under Variable Pressure Condition

作　　者：吴正人[1] 周鑫宇 张亚萌 WU Zhengren;ZHOU Xinyu;ZHANG Yameng(Department of Power Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学动力工程系,河北保定071003

出　　处：《电力科学与工程》2021年第8期67-72,共6页Electric Power Science and Engineering

摘　　要：为了研究在不同喷雾压力下喷嘴组的雾化特性,采用GAMBIT软件进行建模,并利用FLUENT软件分别模拟了在不同喷雾压力下(1 MPa、1.25 MPa、1.5 MPa)喷嘴组的雾化情况。结果表明,在其他条件均不改变的情况下,随着喷雾压力变大,液滴的索特平均直径(SMD)变小,液滴的速度变大,且液滴大小分布整体向小的方向偏移,液滴速度分布最密集的区间向速度更大的方向偏移;液滴的SMD在喷嘴附近迅速增大,随着液滴远离喷嘴,SMD的大小趋于平稳;不同喷雾压力下的3个雾化场分别在其各个喷嘴的中心处液滴速度达到最大,其次是干涉区的液滴速度较大。In order to study the atomization characteristics of nozzle group under different spray pressures,the software was modeled by GAMBIT,and the atomization of spray nozzles under different spray pressures(1 MPa,1.25 MPa,1.5 MPa)was simulated by FLUENT software.The results show that when the other conditions do not change,the spray pressure increases,the Sauter mean diameter(SMD)of droplet becomes smaller,the droplet velocity increases,and the droplet size distribution shifts to a smaller direction.The densest interval of droplet velocity distribution is more offset to the greater velocity.The SMD of droplet near the nozzle increases rapidly,and tends to be stable as the droplets are far away from the nozzle.The droplet velocity reaches the maximum at the center of each nozzle at the three atomizing fields under different spray pressures,followed by the larger droplet velocity in the interference zone.

关 键 词：喷雾冷却 雾化特性 喷嘴组 压力 数值模拟 

分 类 号：TK05[动力工程及工程热物理]