火箭推进

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N2O4,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N1时,喷嘴的雾化锥角略微增大; 当N=0时,UDMH与N2O4液膜之间会形成低压区,使得UDMH液膜张角减小,N2O4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N2O4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 N2O4 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 N1, the spray angle increases slightly. In addition, when N=0, a low-pressure area will be formed between UDMH and N2O4 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 N2O4 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 N2O4 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.

引言
1 数值计算方法
2 计算模型验证
3 结果与讨论
4 结论

图1 喷嘴几何结构简图<br/>Fig.1 Schematic diagram of nozzle structure

图1 喷嘴几何结构简图
Fig.1 Schematic diagram of nozzle structure

表1 四氧化二氮物性参数<br/>Tab.1 The physical property parameters of N2O4

表1 四氧化二氮物性参数
Tab.1 The physical property parameters of N2O4

表2 偏二甲肼物性参数<br/>Tab.2 The physical property parameters of UDMH

表2 偏二甲肼物性参数
Tab.2 The physical property parameters of UDMH

图2 流体域及网格示意图<br/>Fig.2 Schematic diagram of fluid region and computation mesh

图2 流体域及网格示意图
Fig.2 Schematic diagram of fluid region and computation mesh

图3 试验系统图<br/>Fig.3 Experimental system diagram

图3 试验系统图
Fig.3 Experimental system diagram

图4 水试雾化锥角<br/>Fig.4 The spray angle of water test

图4 水试雾化锥角
Fig.4 The spray angle of water test

图5 仿真计算结果
Fig.5 Simulation result

$图6 N=0时各时刻相体积分数云图 Fig.6 Volume fraction contour of different time under N=0$

图6 N=0时各时刻相体积分数云图
Fig.6 Volume fraction contour of different time under N=0

图7 N=0时各时刻标线处压力曲线<br/>Fig.7 Pressure curved track line of different time under N=0

图7 N=0时各时刻标线处压力曲线
Fig.7 Pressure curved track line of different time under N=0

$图8 N=0.42时各时刻相体积分数云图 Fig.8 Volume fraction contour of different time under N=0.42$

图8 N=0.42时各时刻相体积分数云图
Fig.8 Volume fraction contour of different time under N=0.42

$图9 N=0.85时各时刻相体积分数云图 Fig.9 Volume fraction contour of different time under N=0.85$

图9 N=0.85时各时刻相体积分数云图
Fig.9 Volume fraction contour of different time under N=0.85

$图10 N=1时各时刻相体积分数云图 Fig.10 Volume fraction contour of different time under N=1$

图10 N=1时各时刻相体积分数云图
Fig.10 Volume fraction contour of different time under N=1

图11 不同N时液膜撞击点位置<br/>Fig.11 The impact point of the liquid film under different N

图11 不同N时液膜撞击点位置
Fig.11 The impact point of the liquid film under different N

$图12 不同N时相体积分数云图 Fig.12 The stable volume fraction contour of under different N$

图12 不同N时相体积分数云图
Fig.12 The stable volume fraction contour of under different N

图13 雾化锥角随N的变化关系曲线<br/>Fig.13 Spray angle variation with different N

图13 雾化锥角随N的变化关系曲线
Fig.13 Spray angle variation with different N

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备注

引言

1 数值计算方法

2 计算模型验证

3 结果与讨论

4 结论

期刊信息