柴油液滴撞击高温壁面运动特性
Characteristics of Diesel Droplet Impact on High-temperature Wall Motion
毛宇 1姚本军 1胡新生 1张涛 1王彬 1邹开凤1
作者信息
- 1. 海军航空大学青岛校区 青岛 266041
- 折叠
摘要
针对柴油液滴撞击高温壁面运动特性问题,考虑液滴蒸发传热作用,利用VOF方法追踪气液相界面,对液滴撞壁的非稳态运动过程进行了模拟;观测到液滴在高温壁面上的三种运动形态,并对液滴初速度、直径等影响因素进行了研究.结果表明:随着液滴初速度增大,依次出现回弹、回缩破碎和铺展破碎的运动状态;减小液滴直径有利于回弹,增大液滴直径有利于破碎,但大液滴破碎后会重新聚合.最后以韦伯数作为判别标准,给出了微米级柴油液滴撞击高温壁面回弹及破碎的临界条件.
Abstract
In response to the problem of the motion characteristics of diesel droplets hitting high-temperature walls,this article considers the evaporation heat transfer effect of droplets and uses the VOF method to track the gas-liquid interface,simulating the non steady state motion process of droplets hitting walls.Three motion modes of liquid droplets on high-temperature walls are observed,and the influencing factors such as initial velocity and diameter of the droplets are studied.The results indicate that as the initial velocity of the droplet increases,the motion states of rebound,retraction fragmentation,and spreading fragmentation occur sequentially.Reducing the droplet diameter is beneficial for rebound,while increasing the droplet diameter is beneficial for fragmentation,but larger droplets will re aggregate after fragmentation.Finally,the Weber number is used as the criterion to determine the critical conditions for the rebound and fragmentation of micrometer sized diesel droplets hitting high-temperature walls.
关键词
液滴/高温壁面/回弹/破碎/数值模拟Key words
droplets/high temperature wall surface/rebound/crushing/numerical simulation引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据