富氧火炬式电点火器出口火焰稳定性研究

杨进慧; 王希杰; 徐世洋; 王晓丽

doi:10.13700/j.bh.1001-5965.2023.0528

富氧火炬式电点火器出口火焰稳定性研究

doi: 10.13700/j.bh.1001-5965.2023.0528

北京航天动力研究所，北京 100076

基金项目:

中国航天科技集团自主研发项目

详细信息

通讯作者:
E-mail：yangjinhui@cq5520.com

中图分类号: V434.1
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- 被引次数: 0
出版历程
- 收稿日期: 2023-08-17
- 录用日期: 2023-11-03
- 网络出版日期: 2023-11-14
- 整期出版日期: 2025-10-31

Study on flame stability of oxygen-rich torch igniter

Beijing Aerospace Propulsion Institute，Beijing 100076，China

Funds:

Research Projects of China Aerospace Science and Technology Corporation

More Information

Corresponding author: E-mail：yangjinhui@cq5520.com

摘要

摘要:
富氧火炬式电点火器在低压、宽工况及推进剂入口温度大幅变化等极限工况下存在燃气温度偏低、不均匀及出口流速过快等火焰不稳定性现象。基于此，采用试验仿真方法研究了富氧火炬式电点火器缩进、扩口、扩口凹腔3种火焰稳定结构对出口火焰稳定性的影响。扩口凹腔结构将中心燃气向壁面引流，降低掺混区内流速延长燃气停留时间，并在凹腔结构内形成回流区促进补燃。极限工况下，相较于缩进结构，扩口凹腔结构火焰出口中心燃气温度下限由1 000 K提升至1 200 K，与设计工况温度差由高于100 K降至50 K以内，出口马赫数由1.4降至声速，有效提升了点火器的出口火焰稳定性。
- 点火器 /
- 极限工况 /
- 火焰稳定 /
- 缩进 /
- 扩口 /
- 扩口凹腔
Abstract:
Flame instability appeared under wide extreme sub-atmospheric conditions with varied inlet propellant temperatures, manifested as inadequate ignition energy, uneven gas temperatures, and excessive gas velocity. This paper investigated three flame stability methods: recess, flared outlet and flared cavity, through experiments and simulations. The flared cavity directs the central gas to mix and react with the cooling hydrogen, which also slows down the mixture and enhances reburning in the recirculation zone. Compared to the recess igniter under extreme conditions, the center gas temperature of the flared cavity increases from 1000 K to 1200 K. The temperature difference from the design point decreases from 100 K to 50 K, and the outlet Mach number decelerates from 1.4 to sonic. The flared cavity significantly improves the flame stability of the oxygen-rich torch igniter.
- igniter /
- extreme condition /
- flame stability /
- recess /
- flared outlet /
- flared cavity outlet

HTML全文

图 1 点火器火焰稳定结构示意图^[10]

Figure 1. Torch igniter flame stability reburning chamber^[10]

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图 2 网格无关性验证

Figure 2. Grid independence verification

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图 3 富氧点火器试验

Figure 3. Oxygen-rich torch igniter experiment

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图 4 富氧点火器试验曲线

Figure 4. Curves of oxygen-rich torch igniter experiments

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图 5 仿真模型验证

Figure 5. Validation of simulation model

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图 6 缩进补燃腔出口细铜丝烧断情况

Figure 6. Fusing of copper wire at recess reburning chamber outlet

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图 7 扩口凹腔结构的局部流场分布

Figure 7. Flow field distribution for flared cavity

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图 8 环境压力对火焰出口温度的影响

Figure 8. Effect of ambient pressure on flame temperature

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图 9 环境压力对火焰出口速度的影响

Figure 9. Effect of ambient pressure on flame velocity

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图 10 中心混合比对火焰出口温度的影响

Figure 10. Effect of central mixture ratio on flame temperature

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图 11 中心混合比对火焰出口速度的影响

Figure 11. Effect of central mixture ratio on flame velocity

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图 12 推进剂入口温度对火焰出口温度的影响

Figure 12. Effect of propellant inlet temperature on flame temperature

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图 13 推进剂入口温度对火焰出口速度的影响

Figure 13. Effect of propellant inlet temperature on flame velocity

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