缩进长度对液液同轴离心喷嘴雾化过程的影响  

Effect of indentation length of liquid-liquid coaxial swirling injector on spray process

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)

机构地区：[1]西安航天动力研究所液体火箭发动机技术重点实验室,陕西西安710100 [2]西安航天动力研究所,陕西西安710100

出　　处：《火箭推进》2024年第3期42-52,共11页Journal of Rocket Propulsion

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.

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 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程]