可调节双介质外混式喷嘴雾化特性的数值模拟  

Numerical Simulation on Atomization Characteristics of Adjustable Dual-medium External Mixing Nozzles

作　　者：付文锋[1] 许龙[2] 吴启东 杨小娜[2] 肖华[2] 吴正人[1] FU Wenfeng;XU Long;WU Qidong;YANG Xiaona;XIAO Hua;WU Zhengren(Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,North China Electric Power University,Baoding 071003,Hebei,China;Baoding Cigarette Factory of Hebei Baisha Tobacco Co.,Ltd.,Baoding 071000,Hebei,China)

机构地区：[1]华北电力大学河北省低碳高效发电技术重点实验室,河北保定071003 [2]河北白沙烟草有限责任公司保定卷烟厂,河北保定071000

出　　处：《济南大学学报（自然科学版）》2023年第1期102-107,115,共7页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(12172129);河北中烟工业有限责任公司重点项目(HBZY2021A005)。

摘　　要：以采用蒸汽工质的某双介质喷嘴为研究对象,通过构建离散相模型,开展不同工况下的喷嘴雾化数值模拟计算,研究不同蒸汽入口压力与不同针阀开度对喷嘴雾化特性的影响。结果表明:雾化液滴的空间分布受喷嘴非对称进气结构的影响,在滚筒腔体内呈现非对称分布;雾化液滴粒径随空间位置变化显著,在雾化范围外部的液滴粒径最大,在雾化空间内部液滴粒径较小,约为1μm;随着蒸汽入口压力的增大,雾化液滴平均粒径减小;随着气液相对速度的增大,液滴最大粒径与平均粒径均减小,雾化效果显著改善。Taking a double medium nozzle of steam working medium as the research object and by constructing a discrete phase model,the numerical simulation calculation of nozzle atomization under different working conditions was carried out to study the effects of different steam inlet pressures and needle valve openings on atomization characteristics of the nozzle.The results show that the spatial distribution of atomized droplets is asymmetric in the drum chamber due to the asymmetric inlet structure of the nozzle.The diameter of atomized droplets changes significantly with the spatial location,the size of droplets outside the atomization range is the largest,and the diameter of droplets inside the atomization space is small,which is about 1μm.With the increase of steam inlet pressure,the average diameter of atomized droplets decreases.With the increase of gas-liquid relative velocity,the maximum and average diameters of droplets decrease,and the atomization effect is significantly improved.

关 键 词：双介质喷嘴 雾化液滴 空气动力特性 数值模拟 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]