采用详细化学反应机理的火焰面模型模拟煤油两相燃烧流场

王慧汝; 金捷; 柳杨

采用详细化学反应机理的火焰面模型模拟煤油两相燃烧流场

北京航空航天大学能源与动力工程学院, 北京 100191

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出版历程
- 收稿日期: 2010-07-03
- 修回日期: 2010-09-08
- 刊出日期: 2011-07-28

Flamelet modeling of two-phase kerosene combustion flow fields using a detailed chemical reaction mechanism

School of Jet Propulsion, Beijing University of Aeronautics and Astronautics,Beijing 100191,China

摘要

摘要: 基于可实现的 k-ε湍流模型、颗粒随机轨道模型、火焰面模型和航空煤油详细化学反应机理对模型燃烧室内两相燃烧流场进行了数值模拟.其中详细反应机理由替代燃油(80%质量分数的正癸烷,20%质量分数的1,2,4-三甲基苯)的反应机理和NO_x的反应机理组合而成.通过与实验数据的比较,考察采用该详细化学反应机理的火焰面模型模拟RP-3航空煤油燃烧流场的准确性,特别是污染物排放计算的精度.结果表明:稳态火焰面模型模拟的温度场和CO₂生成量与实验数据吻合较好,而预测的NO排放量与实验值偏差较大;非稳态火焰面模型显著提高了NO的预测精度,在工况1(来流马赫数为0.16,进口温度为537K,油气比为0.0048,常压)条件下与实验数据吻合较好,但在工况2 (来流马赫数为0.155,进口温度为523K,油气比为0.010,常压)条件下仍过高估计了NO的排放量.
- 航空煤油 /
- 替代燃油 /
- 详细化学反应机理 /
- 火焰面模型 /
- NO排放
Abstract: Two-phase combustion flow fields in a model combustor were numerically simulated using realizable k-ε turbulent model,particles stochastic trajectory model,flamelet models and the detailed chemical reaction mechanism of aviation kerosene.The detailed reaction mechanism was assembled using the combustion mechanism of surrogate fuel (80% decane and 20% 1,2,4-trimethylbenzene by mass fraction) and NO_x formation mechanism.The accuracy of flamelet modeling of RP-3 kerosene combustion flow fields (especially for NO emissions) employing the detailed reaction mechanism was investigated by comparison with the experimental data.The result shows that the temperature and CO₂ concentrations predicted using the steady flamelet model are in good agreement with the experimental data,but the NO emissions have a bigger deviation.The use of unsteady flamelet model significantly improves the prediction accuracy of NO concentrations and shows good agreement with the experimental data in condition 1 (inlet Mach number 0.16,inlet temperature 537K,fuel-air ratio 0.0048,atmospheric pressure),but NO emissions are overpredicted in condition 2(inlet Mach number 0.155,inlet temperature 523K,fuel-air ratio 0.010,atmospheric pressure).
- aviation kerosene /
- surrogate fuel /
- detailed chemical reaction mechanism /
- flamelet model /
- NO emissions

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参考文献(20)

[1]	Dagaut P.Kinetic of jet fuel combustion over extended conditions:experimental and modeling[J].Journal of Engineering for Gas Turbine and Power,2009,129(2):394-403.
[2]	Honnet S,Seshadri K,Niemann U,et al.A surrogate fuel for kerosene[J].Proceedings of the Combustion Institute,2009,32(1):485-492.
[3]	Hewson J C,Bollig M.Reduced mechanisms for NO_x emission from hydrocarbon diffusion flames[J].Symposium (International) on Combustion,1996,26(2):2171-2179.
[4]	Pope S B.PDF methods for turbulent reactive flows[J].Progress in Energy and Combustion Science,1985,11(2):119-192.
[5]	Klimenko A Y,Bilger R W.Conditional moment closure for turbulent combustion[J].Progress in Energy and Combustion Science,1999,25(6):595-687.
[6]	Peters N.Laminar diffusion flamelet models in nonpremixed turbulent combustion[J].Progress in Energy and Combustion Science,1984,10(3):319-359.
[7]	Peters N.Turbulent combustion[M].London:Cambridge University Press,2000.
[8]	Claramunt K,Consul R,Carbonell D,et al.Analysis of the laminar flamelet concept for nonpremixed laminar flames[J].Combustion and Flame,2006,145(4):845-862.
[9]	董刚,王海峰,陈义良.用火焰面模型模拟甲烷/空气湍流射流扩散火焰[J].力学学报,2005,37(1):73-79. DONG Gang,WANG Haifeng,CHEN Yiliang.Simulation of methane/air turbulent jet diffusion flame by flamelet models[J].Acta Mechanica Sinica,2005,37(1):73-79.(in Chinese)
[10]	Barths H,Peters N,Brehm N,et al.Simulation of pollutant formation in a gas turbine combustor using unsteady flamelets[J].Symposium (International) on Combustion,1998,27(2):1841-1847.
[11]	Odedra A,Malalasekera W.Eulerian particle flamelet modeling of a bluff-body CH₄/H₂ flame[J].Combustion and Flame,2007,151(3):512-531.
[12]	Coelho P J,Peters N.Unsteady modelling of a piloted methane/air jet flame based on the Eulerian particle flamelet model[J].Combustion and Flame,2001,124(3):444-465.
[13]	Kim S K,Kim Y.Assessment of the Eulerian particle flamelet model for nonpremixed turbulent jet flames[J].Combustion and Flame,2008,154(1-2):232-247.
[14]	Wen Z,Yun S,Thomson M J,et al.Modeling soot formation in turbulent kerosene/air jet diffusion flames[J].Combustion and Flame,2003,135(3):323-340.
[15]	Bath H,Hasse C,Bikas G,et al.Simulation of combustion in direct injection diesel engines using a Eulerian particle flamelet model[J].Proceedings of the Combustion Institute,2000,28(1):1161-1168.
[16]	Riesmeier E,Honnet S,Peters N.Flamelet modeling of pollutant formation in a gas turbine combustion chamber using detailed chemistry for a kerosene model fuel[J].Journal of Engineering for Gas Turbines and Power,2004,126(4):899-905.
[17]	Yakhot V,Orsszag S A,Thangam S,et al.Development of turbulence models for shear flows by a double expansion technique[J].Physics of Fluids A,1992,4(7):1510-1520.
[18]	FLUENT公司.FLUENT用户手册[M].刘奇,译.北京:北京理工大学出版社,2003.
[19]	Jones W P,Whitelaw J H.Calculation methods for reacting turbulent flows:a review[J].Combustion and Flame,1982,48:1-26.
[20]	解茂昭.内燃机计算燃烧学[M].2版.大连:大连理工大学出版社,2005.