Numerical study of test gas vitiation effects on hydrogen-fueled scramjet combustion
Numerical study of test gas vitiation effects on hydrogen-fueled scramjet combustion
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摘要: The effects of major vitiated species (H2O and CO2) and minor vitiated species (H,OH and O radicals) produced by combustion air preheater on ignition and combustion of hydrogen-fueled scramjet were numerically investigated.Firstly,kinetic analyses with CHEMKIN SENKIN code were conducted to evaluate the effects of contamination on the ignition delay times of hydrogen fuel over a range of temperature and pressure variations.Then numerical simulation of a three-dimensional reacting flow in hydrogen-fueled scramjet combustor was performed.The two-equation shear stress transport κ-ω turbulence model was used for modeling turbulence and 33 reactions finite-rate chemistry was used for modeling the H2/air kinetics.The results show that: free radical species such as H,O,and OH may significantly promote the ignition process of hydrogen-air at relatively low initial temperature and pressure.However,H2O and CO2 have inhibition effects on the ignition process.Under the same conditions,H2O has more effective inhibition effects than CO2.The temperature and pressure rise due to combustion are lower in the air vitiated with H2O and CO2 because of their higher heat capacities and more dissociation.Combustion efficiency and thrust calculated for vitiated air case are lower than clean air case.These results indicate the importance of accounting for vitiation effects when extrapolating performance data from ground test to flight demonstration.
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关键词:
- scramjet /
- contaminant /
- ignition /
- supersonic combustion /
- preheater
Abstract: The effects of major vitiated species (H2O and CO2) and minor vitiated species (H,OH and O radicals) produced by combustion air preheater on ignition and combustion of hydrogen-fueled scramjet were numerically investigated.Firstly,kinetic analyses with CHEMKIN SENKIN code were conducted to evaluate the effects of contamination on the ignition delay times of hydrogen fuel over a range of temperature and pressure variations.Then numerical simulation of a three-dimensional reacting flow in hydrogen-fueled scramjet combustor was performed.The two-equation shear stress transport κ-ω turbulence model was used for modeling turbulence and 33 reactions finite-rate chemistry was used for modeling the H2/air kinetics.The results show that: free radical species such as H,O,and OH may significantly promote the ignition process of hydrogen-air at relatively low initial temperature and pressure.However,H2O and CO2 have inhibition effects on the ignition process.Under the same conditions,H2O has more effective inhibition effects than CO2.The temperature and pressure rise due to combustion are lower in the air vitiated with H2O and CO2 because of their higher heat capacities and more dissociation.Combustion efficiency and thrust calculated for vitiated air case are lower than clean air case.These results indicate the importance of accounting for vitiation effects when extrapolating performance data from ground test to flight demonstration.-
Key words:
- scramjet /
- contaminant /
- ignition /
- supersonic combustion /
- preheater
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[1] Edelman R B,Spabaccini L J.Analytical investigation of the effects of vitiated air contamination on combustion and hypersonic air breathing ground tests.AIAA 1969-338,1969. [2] Pellett G L,Burno C,Chinitz W.Review of air vitiation effects on scramjet ignition and flame-holding combustion processes.AIAA 2002-3880,2002. [3] Rogers R C,Schexnayder C J Jr.Chemical kinetic analysis of hydrogen-air ignition and reaction times.NASA TP-1856,1981. [4] Han B,Sung C J.Effects of vitiated air on hydrogen ignition in a supersonic laminar mixing layer.AIAA 2002-0332,2002. [5] Stephen J M,Steven H F.Numerical modeling of supersonic combustion: validation and vitiation studies using FLUENT.AIAA 2005-4278,2005. [6] Shivakumar S,Wayne D E.Interpretation of vitiation effects on testing at Mach 7 flight conditions.AIAA 1995-2719,1995. [7] Mitani T,Hiraiwa T,Sato S,et al.Comparison of scramjet engine performance in Mach 6 vitiated and storage-heated air[J]. Journal of Propulsion and Power,1997,13(5):635-642. [8] Sadatake T,Tetsuo H,Kan K,et al.Vitiation effects on scramjet engine performance in Mach 6 flight conditions[J].Journal of Propulsion and Power,2007,23(4):789-796. [9] Goyne C P,Mcdaniel J C,Krauss R H,et al.Test gas vitiation effects in a dual-mode scramjet combustor[J].Journal of Propulsion and Power,2007,23(3):559-565. [10] Rockwell R D,Goyne C P,Haw W,et al.Experimental study of test medium vitiation effects on dual-mode scramjet mode transition.AIAA 2010-1126,2010. [11] Lutz A E,Kee R J,Miller J A.Senkin:a fortran program for predicting homogeneous gas phase chemical kinetics with sensitivity analysis.Sandia National Laboratories Report,SAND 87-8248.1987. [12] Menter F R.Zonal two equation κ-ω models for aerodynamic flows.AIAA 93-2906,1993. [13] Casimir J J.An analytical study of the hydrogen air reaction mechanism with application to scramjet combustion.NASA TP-2791,1988. [14] Lewis B,Elbe G.Combustion,flames,and explosions of gases[M].3rd ed.New York:Academic,1987. [15] Kumaran K,Babu V.Investigation of the effect of chemistry models on the numerical predictions of the supersonic combustion of hydrogen[J].Combustion and Flame,2009,156(1):826-841. -
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