超声速气流中液体喷雾流动数值模拟研究  

Numerical Simulation of Liquid Spray Flow in Supersonic Airflow

作　　者：冼锦宇 陈钱 蔡树峰 Xian Jinyu;Chen Qian;Cai Shufeng(Sun Yat-sen University,Shenzhen 518107,China)

机构地区：[1]中山大学,广东深圳518107

出　　处：《航空科学技术》2023年第1期12-20,共9页Aeronautical Science & Technology

基　　金：国家自然科学基金(91741102);深圳市基础研究面上项目(JCYJ20190807160413162);中央高校基本科研业务费专项资金青年教师重点培育项目(19lgzd15)。

摘　　要：超声速气流中液体喷雾流动特性对超声速燃烧基础研究及其工程应用具有重要意义。为了定量探索超声速气流中液体横向射流雾化特性,本文对超声速气流中液体喷雾流动进行了数值模拟研究。数值模拟方法基于Eulerian-Lagrangian两相流计算架构,考虑气液双向耦合,采用KH/RT液滴二次破碎模型计算液滴雾化过程,采用大涡模拟计算气相流动。结果表明,该数值模拟方法所获得的液雾场突起结构、穿透高度、液滴平均速度分布等液雾特性均能与试验结果较符合;初始液滴直径分布对破碎后液滴平均速度影响较小而对破碎后液滴平均直径及液相平均体积分数影响较大,初始液滴直径分布需在后续的建模与模拟中进行更多研究。The flow characteristics of liquid spray in supersonic flow are of great significance to the basic research and engineering application of supersonic combustion.In order to quantitatively explore the characteristics of liquid transverse jet atomization in supersonic flow,numerical simulation of liquid spray flow in supersonic flow is carried out.The numerical simulation method is based on the Eulerian-Lagrangian two-phase flow calculation architecture.Two-way couple of gas and liquid is adopted.The KH/RT droplet secondary breakup model is used for the calculation of atomization.Large eddy simulation is utilized for the calculation of gas flow.The results show that the liquid atomization characteristics,such as the protrusion structure of the liquid atomization field,the penetration height and the average droplet velocity distribution,can be obtained by the numerical simulation method in good agreement with the experiment.Initial droplet diameter distributions have a small effect on the average velocity of the droplet after breakup,but have a greater impact on the average diameter of the droplets after breakup and on average volume fraction,which implies further research on initial droplet diameter distribution in future modeling and simulation.

关 键 词：超声速气流 液滴破碎 雾化 气液两相流 大涡模拟 

分 类 号：V231.23[航空宇航科学与技术—航空宇航推进理论与工程]