This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Auto-ignition of Transient Turbulent Gaseous Fuel Jets at High Pressure
Technical Paper
2006-01-3432
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
An experimental investigation of the autoignition of transient gaseous fuel jets in heated and compressed air is conducted in a shock tube facility. Experiments are performed at an initial pressure of 30 bar with initial oxidizer temperatures ranging from 1150 K to 1400 K, injection pressures ranging from 60 bar to 150 bar, and with injector tip orifice diameters of 0.275 mm and 1.1 mm. Under the operating conditions studied, increasing temperature results in a significant decrease in autoignition delay time, td. The smaller orifice results in an increase in ignition delay time and variability, as compared with the larger orifice. For initial temperatures below about 1250K, ignition is rarely achieved with the smaller orifice, whereas ignition is always achieved with the larger orifice down to 1150 K. Under the conditions studied, increasing the injection pressure decreases ignition delay, a result dynamically consistent with larger orifice size decreasing ignition delay time. The downstream location of the ignition kernel, Zk, relative to the jet penetration distance, Z, is found to be in the range, 0.4 < Zk/Z < 0.8, with both orifices, while its location relative to the equivalent orifice diameter, d∗, is in the range, 15 < Zk/d∗ < 35, using the large orifice, and 25 < Zk/d∗ < 65 using the small orifice. A scaling model is developed for the ignition delay time and region of initial kernel formation. The model assumes an initial period characterized by relatively high scalar dissipation and inhibited chemical reaction followed by a reaction period that proceeds at a rate determined by a local chemical timescale. Model predictions for ignition delay and region of kernel formation are in good quantitative agreement with experimental measurements from the present work and are found to be in qualitative agreement with findings from previous studies.
Authors
Citation
Sullivan, G., Huang, J., Bushe, W., and Rogak, S., "Auto-ignition of Transient Turbulent Gaseous Fuel Jets at High Pressure," SAE Technical Paper 2006-01-3432, 2006, https://doi.org/10.4271/2006-01-3432.Also In
References
- Hill, P.G. Douville, B. “Analysis of Combustion in Diesel Engines Fueled by Directly Injected Natural Gas” Journal of Engineering for Gas Turbines and Power 122 141 149 2000
- Spadaccini, L.J. Colket, M.B. III “Ignition Delay Characteristics of Methane Fuels” Prog. Fuels. Prog. Energy Combust. Sci. 20 431 460 1994
- Huang, J. Hill, P.G. Bushe, W.K. Munshi, S.R. “Shock-Tube Study of Methane Ignition under Engine-Relevant Conditions: Experiments and Modeling” Combustion and Flame 136 25 42 2004
- Fraser, R.A. Siebers, D.L. Edwards, C.F. “Autoignition of methane and natural gas in a simulated diesel environment” SAE Paper 910227 1991
- Naber, J.D. Siebers, D.L. Julio, S.S. Westbrook, C.K. “Effects of Natural Gas Composition on Ignition Delay Under Diesel Conditions” Combustion and Flame 99 192 200 1994
- Markides, C.N. Mastorakos, E. “Turbulent Autoignition of Hydrogen and Acetylene in a Duct,” Proceedings of the European Combustion Meeting 2003
- Mastorakos, E. Baritaud, T.A. Poinsot, T.J. “Numerical simulations of autoignition in turbulent mixing flows” Combustion and Flame 109 198 223 1997
- Hilbert, R. Thévenin, D. “Autoignition of Turbulent Nonpremixed Fames Investigated Using Direct Numerical Simulation” Combustion and Flame 128 22 37 2002
- Im, H.G. Chen, J.H. Law, C.K. “Ignition of Hydrogen-Air Mixing Layer in Turbulent Flows” Twenty-Seventh Symposium (International) on Combustion The Combustion Institute Pittsburgh 1047 1056 1998
- Bi, H. Agrawal, A.K. “Study of Autoignition of Natural Gas in Diesel Environments Using Computational Fluid Dynamics with Detailed Chemical Kinetics” Combustion and Flame 113 289 302 1998
- Kim, S.H. Huh, K.Y. Fraser, R.A. “Numerical Prediction of the Autoignition Delay in a Diesel-Like Environment by the Condition Moment Closure Model” SAE Paper 2000-01-0200 2000
- Hill, P.G. Ouellette, P. “Transient turbulent gaseous fuel jets for diesel engines” Journal of Fluids Engineering 121 93 101 1999
- Huang, J. “Experimental Shock Tube Study of Ignition Promotion for Methane under Engine Relevant Conditions,” University of British Columbia Vancouver, Canada 2000
- Iaconis, J.L. “An Investigation of Methane Autoignition Behaviour Under Diesel Engine-Relevant Conditions,” University of British Columbia Vancouver, Canada 2001
- List, E.J. “Turbulent Jets and Plumes” Ann. Rev. Fluid Mech. 14 189 212 1982
- Sullivan, G.D. Huang, J. Wang, T.X. Bushe, W.K. Rogak, S.N. “Emissions Variability in Gaseous Fuel Direct Injection Compression Ignition Combustion” SAE Paper 2005-01-0917 2005