进气道结构对固体冲压发动机补燃室燃烧及内壁流场的影响

王金金; 查柏林; 张炜; 惠哲; 苏庆东; 何齐

doi:10.13700/j.bh.1001-5965.2018.0525

进气道结构对固体冲压发动机补燃室燃烧及内壁流场的影响

doi: 10.13700/j.bh.1001-5965.2018.0525

王金金¹,
查柏林^1, ,,
张炜¹,
惠哲¹,
苏庆东¹,
何齐²

1.
火箭军工程大学导弹工程学院, 西安 710025
2.
南昌航空大学测试与光电工程学院, 南昌 330063

基金项目:

火炸药重大专项

详细信息

作者简介:
王金金  男, 博士研究生。主要研究方向:火箭发动机流场分析及航天材料烧蚀评估

查柏林  男, 博士, 教授, 博士生导师。主要研究方向:火箭发动机及航天材料性能失效评估

张炜  男, 博士, 教授, 博士生导师。主要研究方向:推进系统检测与故障诊断

通讯作者:
查柏林, E-mail:zhabailin@163.com

中图分类号: V438
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出版历程
- 收稿日期: 2018-09-05
- 录用日期: 2019-01-11
- 网络出版日期: 2019-05-20

Effect of air-inlet structures on combustion and flow field of inner wall in secondary combustion chamber of solid rocket ramjet

1.
College of Missile Engineering, Rocket Force University of Engineering, Xi'an 710025, China
2.
School of Measuring and Optical Engineering, Nanchang Hangkong University, Nanchang 330063, China

Funds:

Explosives and Propellants Major Project

More Information

Corresponding author: ZHA Bailin, E-mail:zhabailin@163.com

摘要

摘要:
为研究进气道结构对固体冲压发动机补燃室燃烧及内壁烧蚀的影响，采用标准k-ε湍流模型，单步涡耗散燃烧模型与KING硼粒子点火燃烧模型，开展了双下侧90°进气结构和双侧180°进气结构固体冲压发动机补燃室内燃气燃烧数值模拟，对比分析了补燃室燃气燃烧流场特征和内壁烧蚀环境特征。结果表明：双侧180°进气结构在补燃室中形成大漩涡，有利于燃气与空气的掺混燃烧，至补燃室出口位置，总燃烧效率超过90%，且该结构有效减少了粒子对内壁的冲刷侵蚀；在双下侧90°进气结构补燃室中，凝聚相粒子和燃气贴近补燃室一侧运动，导致氧气浓度和温度分布不均，不利于燃气的掺混燃烧，总燃烧效率为74%，在远离补燃室进气道一侧形成高温热烧蚀、高浓度粒子侵蚀、高速射流冲刷和热应力集中的综合破坏；双侧180°进气结构的固体冲压发动机补燃室总体性能优于双下侧90°进气结构的冲压发动机补燃室。
- 固体冲压发动机 /
- 补燃室 /
- 进气道结构 /
- 燃烧效率 /
- 烧蚀
Abstract:
In order to study the effect of air-inlet structures on combustion and ablation combustion chamber of solid ramjet, the flow field characteristics in the secondary in the secondary combustion chamber of solid rocket ramjet with bilateral 180° air-inlet structure and bilateral 90° air-inlet structure on both down sides were analyzed based on the standard k-ε turbulence model, a one-step eddy-dissipation combustion model and combustion mode of boron particles of KING. The results show that large whirlpools are formed in the secondary combustion chamber with bilateral 180° air-inlet structure, which is beneficial to the mixing and combustion of gas and air. The total combustion efficiency of gas phase is 90% at the outlet of the secondary combustion chamber. Moreover, the erosion due to particles is effectively reduced. In the secondary combustion chamber with bilateral 90° air-inlet structure, condensed phase particles and gas move along the unilateral combustion chamber wall, leading to the uneven distribution of oxygen mass fraction and temperature, which are not conducive to combustion of gas. The total combustion efficiency of gas phase is 74%. Comprehensive destruction due to high-temperature thermal ablation, high-concentration particle erosion, high-velocity jet flushing and thermal stress concentration occurs at the side far from the inlet. The overall performance of the secondary combustion chamber with bilateral 180° air-inlet structure is better than that with bilateral 90° air-inlet structure on both down sides.
- solid rocket ramjet /
- secondary combustion chamber /
- air-inlet structure /
- combustion efficiency /
- ablation

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图 1 两种不同进气道结构的补燃室结构简图

Figure 1. Structure diagram of secondary combustion chamber under two air-inlet structures

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图 2 边界条件

Figure 2. Boundary condition

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图 3 网格划分

Figure 3. Mesh partition

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图 4 网格无关性验证

Figure 4. Grid independency verification

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图 5 补燃室内O₂浓度分布

Figure 5. O₂ concentration distribution in secondary combustion chamber

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图 6 补燃室内温度分布

Figure 6. Temperature distribution in secondary combustion chamber

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图 7 补燃室不同截面燃气成分燃烧效率

Figure 7. Combustion efficiency of gas components with different cross sections

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图 8 补燃室头部射流速度矢量分布

Figure 8. Jet velocity vector distribution on head of secondary combustion chamber

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图 9 截面400 mm位置的射流速度矢量分布

Figure 9. Jet velocity vector distribution on cross section of 400 mm

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图 10 凝聚相粒子运动轨迹和速度分布

Figure 10. Motion path line of condensed phase particles and their velocity distribution

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图 11 补燃室内壁温度分布

Figure 11. Temperature distribution on internal walls of secondary combustion chamber

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图 12 温度分布曲线

Figure 12. Curves of temperature distribution

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图 13 O₂质量分数分布曲线

Figure 13. Curves of O₂ mass fraction distribution

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图 14 速度分布曲线

Figure 14. Curves of velocity distribution

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