Numerical investigation of nozzle flow separation control by injecting secondary jet from nozzle exit

LI Bo; WANG Yi-bai; YANG Li-jun; CHENG Cheng

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Numerical investigation of nozzle flow separation control by injecting secondary jet from nozzle exit

更新时间：2026-07-07

- Numerical investigation of nozzle flow separation control by injecting secondary jet from nozzle exit
- Vol. 28, Issue 11, (2013)
- 作者机构：
  
  北京航空航天大学宇航学院,北京,100191
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013
- 稿件说明：
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LI Bo, WANG Yi-bai, YANG Li-jun, et al. Numerical investigation of nozzle flow separation control by injecting secondary jet from nozzle exit[J]. 2013, 28(11).
DOI：

LI Bo, WANG Yi-bai, YANG Li-jun, et al. Numerical investigation of nozzle flow separation control by injecting secondary jet from nozzle exit[J]. 2013, 28(11). DOI：

摘要

以某液体火箭喷管缩比模型为研究对象

分析了相应的流场形态和二次流喷嘴喷射角度、面积比及其工质总温等参数对喷管分离流动抑制效果的影响.结果表明:当采用二次流喷嘴时

喷管达到满流所需的入口总压下降了37.8%

随着喷嘴喷射角度由0°增至25°

喷管流动分离点位置向喉部推进约0.01m

抑制效果明显变差

而随着喷嘴工质总温由300K升至1500K

喷管流动分离点位置向出口推进约0.005m

抑制效果略有增强

喷嘴面积比在保证其不出现分离流动时对抑制效果没有影响

否则会使抑制效果变差.

Abstract

The subscale nozzle model of a liquid rocket engine was researched.The corresponding flow field configurations were analyzed.The influence of main parameters of the secondary jet injector on control effectiveness was analyzed

including the injection angle

the area ratio and the total temperature of its working fluid.The results indicate that

when the secondary jet injector is adopted

the nozzle inlet total pressure which can make the nozzle reach full flow decreases 37.8%;as the injection angle increases from 0° to 25°

the nozzle flow separation location moves about 0.01m towards the nozzle throat

and the control effectiveness of the device decreases significantly;as the total temperature of the injector's working fluid increases from 300K to 1500K

the nozzle flow separation location moves about 0.005m towards the nozzle exit

and the control effectiveness of the device increases slightly. The area ratio has no effect on flow separation location when no flow separation occurs in the secondary jet injector

otherwise

the control effectiveness of the device will decrease.

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