摘要
为探究缩进长度对液液同轴离心喷嘴雾化锥角的影响,中心喷嘴工质采用N_(2)O_(4),外喷嘴工质采用偏二甲肼(UDMH),通过数值仿真获得了喷嘴内部流场的细节特征以及缩进数N对喷嘴雾化锥角的影响规律。结果表明:当N<1时,喷嘴的雾化锥角呈现先增后减的趋势;当N>1时,喷嘴的雾化锥角略微增大;当N=0时,UDMH与N_(2)O_(4)液膜之间会形成低压区,使得UDMH液膜张角减小,N_(2)O_(4)液膜张角变大,并在液膜末端贴合在一起,最终雾化锥角为外喷嘴与中心喷嘴雾化锥角的中间值;当N>0.85时,UDMH与N_(2)O_(4)会在缩进室内部发生明显的掺混,液膜变形程度加剧;当N>1.27时,缩进室会对内部混合流体起到整流作用,从而使其雾化距离增加。
In order to investigate the effect of indentation length of liquid-liquid coaxial swirling inject on spray process,the detailed characteristics of the internal flow was obtained through numerical simulation,using N_(2)O_(4) as the working fluid for the central nozzle and UDMH as the working fluid for the outer nozzle.Besides,the effect of the N on the spray angle was obtained.The result shows that when N<1,the spray angle increase at first and then decrease.When N>1,the spray angle increases slightly.In addition,when N=0,a low-pressure area will be formed between UDMH and N_(2)O_(4) liquid film,which will make the two liquid films adsorb each other,resulting in a decrease in UDMH liquid film angle and an increase in N_(2)O_(4) liquid film.And the final spray angle is an intermediate value between the outer nozzle and the central nozzle spray angle.When N>0.85,UDMH and N_(2)O_(4) will mix significantly in the indentation chamber,and the deformation of the liquid film intensifies.When N>1.27,the chamber will rectify the mixed fluid,and thus the breaking distance increases.
作者
王壮
党枭睿
胡海峰
卞香港
WANG Zhuang;DANG Xiaorui;HU Haifeng;BIAN Xianggang(Science and Technology on Liquid Rocket Engine Laboratory,Xi'an Aerospace Propulsion Institute,Xi'an 710100,China;Xi'an Aerospace Propulsion Institute,Xi'an 710100,China)
出处
《火箭推进》
CAS
北大核心
2024年第3期42-52,共11页
Journal of Rocket Propulsion
关键词
缩进数
液液同轴离心喷嘴
雾化锥角
流场结构
数值模拟
indentation length
liquid-liquid coaxial swirling injector
spray angle
flow field struture
numerical simulation
