压力条件对旋流槽数不同的离心式喷嘴液膜破碎及雾化的影响研究

doi:10.3901/JME.2021.04.247

机械工程学报 ›› 2021, Vol. 57 ›› Issue (4): 247-256.doi: 10.3901/JME.2021.04.247

• 交叉与前沿 • 上一篇

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压力条件对旋流槽数不同的离心式喷嘴液膜破碎及雾化的影响研究

刘赵淼^1,2, 李泽轩¹, 林家源¹, 逄燕^1,2

1. 北京工业大学材料与制造学部北京 100124;
2. 北京工业大学先进制造技术北京市重点实验室北京 100124

收稿日期:2020-03-16 修回日期:2020-11-15 出版日期:2021-02-20 发布日期:2021-04-28
通讯作者: 逄燕(通信作者),女,1986年出生,博士,副教授。主要从事微流体力学、计算流体力学、流-固耦合分析理论及其工程应用方面的研究。E-mail:pangyan@bjut.edu.cn
作者简介:刘赵淼,女,1970年出生,博士,教授。主要从事微流体力学、计算流体力学、流-固耦合分析理论及其工程应用方面的研究。E-mail:lzm@bjut.edu.cn;李泽轩,男,1995年出生,硕士研究生。主要从事流体力学方面研究。E-mail:lizexuan722@163.com
基金资助:
航空科学基金（20150375001，20160375001）和装备预研领域基金（61409230309）资助项目。

Effect of the Slot Number on the Breakup and Atomization of Liquid Film in Swirl Nozzle

LIU Zhaomiao^1,2, LI Zexuan¹, LIN Jiayuan¹, PANG Yan^1,2

1. Materials and Manufacturing Division, Beijing University of Technology, Beijing 100124;
2. Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing 100124

Received:2020-03-16 Revised:2020-11-15 Online:2021-02-20 Published:2021-04-28

摘要/Abstract

摘要： 利用粒子动态分析仪和高速摄影系统，研究不同注压下的锥形液膜流动、破碎及雾化特性，分析不同注压下液膜流动速度对液膜破碎的作用以及喷雾质量参数的变化规律，并结合相应试验数据求解了锥形液膜的色散方程，验证了注压对液膜破碎的影响。结果表明，随着注入压力增大，喷嘴流量增大，喷嘴液膜破碎长度下降，喷雾锥角先增加后趋于稳定，雾场SMD（索特尔平均直径）减小，雾滴流动速度增大，液膜切向速度对锥形液膜的作用效果显著；旋流槽数的增加使液膜速度增加，喷雾锥角减小，雾滴流速增大，雾场浓度增加且均匀性更好；通过求解色散方程得到了液膜表面波增长率，从理论的角度说明旋流槽数的增加使液膜表面波增长率增加，导致锥形液膜破碎长度减小。

关键词: 离心式喷嘴, 雾化, 液膜破碎, 喷雾锥角

Abstract: The flow, breakup and atomization characteristics of conical liquid film under different injection pressures in a swirl nozzle are investigated with particle dynamic analyzer(PDA) and high-speed photographic system in this study. The effect of the liquid film’s velocity on its breakup and variation rule of spray quality parameters was analyzed under different injection pressure. The dispersion equation of the conical liquid film was solved by combining the corresponding experimental data, which verified the influence of the injection pressure on the breakup of liquid film. The increasing injection pressure will increase the nozzle flow rate and the droplet flow velocity, reduce the liquid film breakup length and the SMD(average diameter of Salter) in the spray field, the tangential velocity of liquid film has obvious effect on conical liquid film and make the spray angle firstly increasing and then stable. Under the same injection pressure, the film velocity, the droplet velocity, as well as the spray field concentration and uniformity are higher for the nozzle with larger swirl slot number, while the spray cone angle is smaller. The growth rate of liquid film surface waves was obtained by solving the dispersion equation, which proves that the increase of the swirl slot number raises the growth rate of liquid film surface waves, and finally decreases the breakup length of liquid film.

Key words: swirl nozzle, atomization, liquid film breakup, spray cone angle

中图分类号:

TG156

刘赵淼, 李泽轩, 林家源, 逄燕. 压力条件对旋流槽数不同的离心式喷嘴液膜破碎及雾化的影响研究[J]. 机械工程学报, 2021, 57(4): 247-256.

LIU Zhaomiao, LI Zexuan, LIN Jiayuan, PANG Yan. Effect of the Slot Number on the Breakup and Atomization of Liquid Film in Swirl Nozzle[J]. Journal of Mechanical Engineering, 2021, 57(4): 247-256.

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压力条件对旋流槽数不同的离心式喷嘴液膜破碎及雾化的影响研究

Effect of the Slot Number on the Breakup and Atomization of Liquid Film in Swirl Nozzle

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