Flammable mixture formation and mixing rates of transient gaseous fuel jet with air in tumbling or swirling motion

• Autorzy: Gharib N. , Sobiesiak A.
• Języki publikacji: EN

Abstrakty

EN

In this study the effects of angular momentum (barrel and axial swirl) on flammable mixture formation and mixing rate between chamber air and transient gaseous jets of hydrogen and methane were numerically investigated in several geometric configurations; in fixed volume cubic and cylindrical chambers, and in a variable volume cylindrical chamber with moving piston. The magnitude of the momentum, injection duration, and injection velocity are the main parameters whose effects were investigated. In the cylindrical chamber with mowing piston dissipation of a bulk air motion vortex, and the angular momentum decay during compression were also studied The numerical simulations were carried out with the use of KIVA3V code modified for gaseous injection with a standard k-e model for turbulence. It was found that hydrogen jet and air mixing under application of angular momentum lead to fast formation of flammable mixture, with the mixing rates several times larger than those for methane jet. Also dynamics of the hydrogen mixing as illustrated by the mixing rate curves is markedly different from those for methane with the same magnitude of angular momentum. The mixing rate curves for hydrogen feature one strong local maximum at time which is half or less of the hydrogen jet injection duration time. Mixing of methane jet with air at all conditions resembles that of hydrogen jet mixing with air at zero or lower levels of angular momentum.

Słowa kluczowe

EN

mixing; axial swirl; barrel swirl (tumble); numerical modelling; KIVA

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2008
• Tom: Vol. 15, No. 3
• Strony: 147--153
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Gharib N.

autor

Sobiesiak A.

• University of Windsor, Department of Mechanical Engineering 401 Sunset Avenue, N9B 3P4 Ontario, Canada tel.:[phone]X. 3889,

Bibliografia

• [1] Oullette, P., G.Hill, P., Turbulent transient gas injections, Journal of Fluids Engineering, Vol. 122, pp. 743-753, 2000.
• [2] Hill, P., G., Douville, B., Analysis of combustion in diesel engines fuelled by directly injected natural gas, Journal of Engineering for Gas Turbines and Power, Vol. 149, pp. 122-141, 2000.
• [3] Boree, J., Maurel, S., Bazile, R., Disruption of a compressed vortex, Physics of Fluids, Vol. 14, pp. 2543-2556, 2002.
• [4] Amsden, A. A., Kiva-3v a block-structured kiva program for engines with vertical or canted valves, Technical Report LA-13313-MS, Los Alamos National Laboratory, 1997.
• [5] Amsden, A. A., ORourke, P., J., Butler, T., D., Kiva-II a computer program for chemically reactive flows with sprays, Technical Report LA-11560-MS, Los Alamos National Laboratory, 1989.
• [6] Wahiduzzaman, S., Ferguson, C. R., Convective heat transfer from a decaying swirling flow within a cylinder, In 8th International heat transfer conference, number 86-IHTC-253, 1986.