实验流体力学2018，Vol.32Issue(1)：78-83,97,7.DOI:10.11729/syltlx20170107
液体圆柱射流在气流中的破碎特性实验研究
Experimental study of the fragmentation behavior of a cylindrical liquid jet into crossflow
摘要
Abstract
This paper used the high speed camera to observe a cylindrical liquid jet into cross-flow and to breakup under the action of wave developments.A direct nozzle has been used,of which the outlet diameter is 1mm and the aspect ratio is 20.The liquid jet in the experiment is water and the crossflow is air.The test temperature is 293K,and the liquid jet velocities are from 2 to 20m/s,with Reynolds number from 2400 to 22400.The velocities of the crossflow change from 10 to 40m/s,with Weber number of from 1.6 to 25.6,that is to say the momentum ratio between the air and the liquid is from 5 to 127.The frame of the high speed camera is 2000 and the exposure time is 1 6 s.The experimental studies have found that:the differences of Weber number of the crossflow will change the fragmentation behavior of the liquid jet and the dimen-sionless surface wave length is proportional to the -0.3 1 power exponent of the Weber number of the crossflow.The distance of the fracture point of liquid column along the direction of the crossflow decreases with the increase of the momentum ratio of the liquid to the air,while it along the initial direction of liquid jet increases with that momentum.The velocity of the droplets produced after fracture on the direction of the crossflow is about 0.1 times as high as that of the crossflow,while it on the direction of initial liquid jet increases linearly with the momentum ratio of the liquid to air firstly,until it becomes 0.8 times of the velocity of initial liquid jet.Based on the above study,this paper had fitted the relation between the wavelength and the Weber number of the crossflow;and also the position of fracture point of the jet,the trajectory of jet,the veloci-ties of produced droplets along with the initial conditions.关键词
圆柱射流/横向气流/破碎特性/表面波/液气动量比/关系拟合Key words
cylindrical liquid jet/crossflow/fragmentation behavior/wave length/momen-tum ratio of the liquid to the air/relation fitting curve分类
航空航天引用本文复制引用
邓甜,蒋帅,高绪万..液体圆柱射流在气流中的破碎特性实验研究[J].实验流体力学,2018,32(1):78-83,97,7.基金项目
国家自然科学基金(51506216) （51506216）
中央高校基本科研业务费中国民航大学专项(ZXH2012H001) （ZXH2012H001）
