乙醇燃烧加热空气污染物对煤油超燃的影响

侯凌云; 杨缙; 马雪松; 刘巍

乙醇燃烧加热空气污染物对煤油超燃的影响

1.
清华大学航天航空学院,北京100084
2.
中国航天科工飞航技术研究院北京动力机械研究所,北京100074

基金项目: 国家自然科学基金(50306011)

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出版历程
- 收稿日期: 2010-10-28
- 修回日期: 2010-12-27
- 刊出日期: 2011-09-28

Influences of vitiation air from ethanol-fueled heating on kerosene-fueled supersonic combustion

1.
School of Aerospace, Tsinghua University, Beijing 100084, China
2.
Beijing Power Machinery Research Institute, Aerodynamic Missile Technology Academy of China Aerospace Science and Industry Comporation, Beijing 100074, China

摘要

摘要: 在燃烧室入口来流马赫数为2.5的条件下,研究乙醇燃烧加热空气污染物对煤油超声速燃烧的影响.在加热器中,采用预混稳态燃烧火焰模型和61组分388步详细反应机理模拟乙醇燃烧加热过程,获得与实验温度条件相同的详细污染出口组分组成.其主要污染空气作为煤油超声速燃烧室的入口组分,采用17组分30步反应机理模拟煤油超声速燃烧过程,研究了污染物组分对煤油超燃室性能的影响.通过化学动力学和热力学分析,对比了地面电加热、乙醇燃烧加热和25km高空三种工况.结果表明:由于自由基作用以及平均分子质量的减小和平均比定压热容的增加,乙醇燃烧加热污染空气造成超燃室的燃烧效率和内推力均上升.
- 煤油超声速燃烧 /
- 乙醇空气加热 /
- 空气污染物 /
- 详细反应 /
- 热力学
Abstract: The influences of vitiation air generated by ethanol-fueled combustion heating on the performances of kerosene-fueled supersonic combustion were studied numerically when the inflow Mach number at the inlet of combustor is 2.5.Premixed burner-stabilized flame model and ethanol-air reaction mechanism with 61 species and 388 steps were used to simulate the combustion in the heater,helping to obtain the components of high-enthalpy air fluid.The reduced reaction mechanism with 17 species and 30 steps were used to simulate the kerosene-fueled supersonic combustion.The contributions of seven main vitiated species such as H₂O,CO₂,O,OH,H,CO,H₂ to the performance of the supersonic combustion were analyzed.Comparing with the cases of electric-heating on the ground and high altitude at the height of 25km,vitiation air causes the increase of combustion efficiency and internal thrust because of the free-radical's function,decrease of averaged molecular mass and increase of averaged specific heat at constant pressure.
- kerosene-fueled supersonic combustion /
- ethanol-air heating /
- vitiation air /
- detailed reaction /
- thermodynamics

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参考文献(12)

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