摘要
喷嘴成膜效果直接影响喷射式凝汽器的换热性能。为进一步提高喷射式凝汽器的工作效率,基于自主搭建的实验系统,利用高速摄影机拍摄液膜,对喷嘴射流撞击平板的成膜特性进行研究。选取1.3、1.9、2.5 m^(3)/h三个流量工况,分析了喷嘴形状、喷嘴与挡板间距、挡板大小对喷嘴成膜面积与液膜形态的影响。结果表明:喷嘴形状对喷嘴成膜影响明显,方形喷嘴成膜面积小,具有稳定的液膜边界;中、大流量下,喷嘴成膜面积随喷嘴与挡板距离减小而增加,对比1 cm间距与5 cm间距,最佳流量工况对应液膜面积可增大13.02%;中、大流量下,喷嘴成膜面积随挡板面积增加而增加,对比大喷嘴挡板与小喷嘴挡板,最佳流量工况对应液膜面积可增加31.37%;小流量下,喷嘴与挡板间距、挡板面积对喷嘴成膜面积影响不明显。
The film-forming effect of the nozzle directly affects the heat transfer performance of jet condensers.To further improve the efficiency of jet condensers,liquid films were photo-graphed by using a high-speed camera and the film-forming characteristics of the jet hitting the flat plate were studied based on liquid films photographed by a high-speed camera equiped on an experimental system built by the paper.The influence of nozzle shape,the distance between the nozzle and the baffle,and the baffle size on the nozzle’s film-forming area and liquid film mor-phology were analyzed under flow conditions of 1.3 m^(3)/h,1.9 m^(3)/h and 2.5 m^(3)/h respectively.Re-sults showed that the nozzle shape significantly affectes film formation,with square nozzles hav-ing smaller film-forming area and stable liquid film boundaries.At medium and high flow rates,the film-forming area increases as the distance between the nozzle and the baffle decreases.By comparing a 1 cm distance with a 5 cm distance,the liquid film area increases by 13.02%at the best flow condition.At medium and high flow rates,the film-forming area increases with an in-crease in baffle area.By comparing a large nozzle baffle with a small one,the film area increases by 31.37%at the best flow condition.At low flow rates,effects of nozzle-to-baffle distance and baffle area on the film-forming area are not significant.
作者
林志超
肖颀
黄崇海
柴盈华
沈平安
徐启嘉
傅祎林
初炜钰
邱睿
孟兆明
LIN Zhichao;XIAO Qi;HUANG Chonghai;CHAI Yinghua;SHEN Ping’an;XU Qijia;FU Yilin;CHU Weiyu;QIU Rui;MENG Zhaoming(School of Nuclear Science and Technology,Harbin Engineering University,Harbin 150001,Heilongjiang;Wuhan Second Ship Design and Research Institute,Wuhan 430064,Hubei)
出处
《火箭军工程大学学报》
2024年第6期58-66,共9页
Journal of Rocket Force University of Engineering
基金
热能动力技术重点实验室开放基金资助项目(TPL2020B01)。
关键词
能源与动力工程
喷嘴成膜
液膜面积
液膜形态
energy and power engineering
nozzle film formation
liquid film area
liquid film morphology
