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| 冲压发动机模型燃烧室低压燃烧性能试验 |
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牛志刚1,2, 费立群1,2, 冯守义1,2, 何小民3
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1.中国航天科工集团三十一研究所 高超声速冲压发动机技术重点实验室,北京 100074;2.中国航天科工集团三十一研究所,北京 100074;3.南京航空航天大学 能源与动力学院,江苏 南京 210016
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| 摘要: |
| 低压不利于燃烧,从化学动力学角度分析,压力降低导致空气密度降低,化学反应速率降低。用冲压发动机模型燃烧室进行了低压燃烧试验,结果显示:进口压力pin从0.094 MPa变至0.065 MPa,燃烧效率由大变小；压力降低到0.065 MPa时,燃烧室燃烧性能急剧恶化,燃烧极不稳定,随时可能因压力波动或油气参数变化而熄火。无传焰槽时燃烧效率随压力的变化规律与有传焰槽的一致,但燃烧效率相对低一些。 |
| 关键词: 冲压喷气发动机 燃烧室 低压 |
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| Experiment on combustion performance of a ramjet prototypecombustor in low pressure condition |
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NIU Zhi-gang1,2, FEI Li-qun1,2, FENG Shou-yi1,2, HE Xiao-min3
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1.Science and Technology on Scramjet Lab., The 31st Research Inst. of CASIC, Beijing 100074, China ;2.The 31st Research Institute of CASIC, Beijing 100074;3.Coll. of Energy and Power,Nanjing Univ. of Aeronautics and Astronautics, Nanjing 210016, China
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| Abstract: |
| Low pressure is an adverse condition for combustion. On the basis of chemical dynamics, decreasing pressure leads to decreasing density of air and decreasing rate of chemical reaction. Experiments in a ram jet prototype combustor were carried out. The results demonstrated that while the inlet pressure of the combustor pin varied from 0.094 to 0.065MPa, the combustion efficiency decreased; when the pressure pin decreased to 0.065MPa, the combustor performance deteriorated rapidly, and the combustion became so unsteady that the fire could quench anytime with the fluctuations of pressure or fuel/ air parameters. The qualitative characteristics of combustion efficiency with pressure were the same whether there was a flame-passing gutter or not, however, the combustion efficiency was lower when there was not. |
| Key words: Combustion chamber Ramjet engine Low pressure |
