摘要
对蒸馏水分别通过压力雾化喷嘴和直流喷嘴喷射到低压环境的喷雾过程进行了实验研究,分析了环境压力、工质温度、工质流量对压力雾化喷嘴喷雾锥角和直流喷嘴喷雾瞬态特征的影响。实验结果显示,当采用压力雾化喷嘴时,环境压力越低,工质初始温度越高,喷雾锥角越大;工质流量越大,工质冲转旋转叶片速度越快,喷雾锥角也越大。当采用直流喷嘴时,环境压力越低,工质温度越高,工质流量越大,液柱出现破碎所用的时间越短。直流喷嘴的喷雾现象表现为随时间生长的过程,喷雾形态经历了液柱—液柱破碎—液柱完全雾化的过程。工质温度、环境压力直接影响工质的过热度,来影响闪蒸的剧烈程度,从而改变喷雾形态。
The characteristics,of spraying of distilled water from atomizing and straight nozzles into a low pressure environment,were studied. The effect of the spraying conditions,including the environmental pressure,initial temperature and flow-rate of distilled water,on the spray cone angle of atomizing nozzle and transient properties of straight nozzle and on the intensity of flash evaporation was investigated. The results show that the spraying conditions had a major impact. To be specific,for an atomizing nozzle,the cone-angle increased with the increases of initial temperature,flow-rate and rotating speed of water and with a decrease of the pressure; for a straight nozzle,the breakage time of liquid column decreased with the increases of the initial temperature and flow-rate of water and with a decrease of the pressure. Moreover,the vacuum flash evaporation depends strongly on water temperature and environment pressure.
作者
刘亿鑫
崔婧格
米梦龙
刘璐
Liu Yixin;Cui Jingge;Mi Menglong;Liu Lu(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2018年第9期750-754,共5页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金项目(51406055)
中央高校基本科研业务费专项资金资助项目(2017MS122)
关键词
低压
瞬态
喷雾锥角
过热度
Low pressure
Transient
Spray cone angle
Superheat
