2012 2(10)

Back to table of content

   Short abstract

 

Pages:

187 - 193

Language:

RU

Ref.:

16


Click to get extended abstract


Download paper: [RU]

2012_2(10)_34.pdf

 

 

MODELING OF SHOCK INDUCED IGNITION OF A SINGLE BUBBLES WITH FUEL VAPOR CONCENTRATION OUTSIDE A FLAMMABLE RANGE

Fomin P.A., Vasiliev A.A.

Lavrentyev Institute of Hydrodynamics SB RAS, Novosibirsk, Russia


Citation:

Fomin, P.A. and Vasiliev, A.A., (2012) Modeling of shock induced ignition of a single bubbles with fuel vapor concentration outside a flammable range, Modern Science: Researches, Ideas, Results, Technologies, Iss. #2(10), PP. 187 - 193.


Keywords:

bubble; shock induced ignition; flammable limits; explosion safety


Abstracts:

Shock induced dynamics and ignition of oxygen containing bubbles in liquid fuels are calculated. Fuel vapor concentration in bubbles is outside a flammable domain. The possibility of fuel vapor condensation of a fuel-rich bubble in liquid cyclohexane during compression is discussed. As a result of fuel vapor condensation the bubbles, which have an initial gas composition above the upper flammable limit, can, nevertheless, explode. The rate of condensation process is estimated. This process is fast enough to shift a chemical composition of a gas into the flammable domain during the first bubble oscillation. Fuel-lean oxygen containing bubbles in 2-ethylhexanal and cumene are considered. It is shown theoretically that fuel vaporization into a bubble, caused by mechanical mixing of liquid and gas phase can increase essentially fuel vapor concentration in the bubble and shift the chemical composition to the flammability domain. This process together with the simultaneous increase of gas temperature during shock induced bubble compression provides reasonable explanation to experimental observations of fuel-lean bubbles ignition.


References:

  1. Howell J.A., Leslie S.W., Kenneth J. Oxidation of cyclohexane // GB Patent. - 1966. - N 1025752.

  2. Alexander J.M. Gas phase ignition in liquid phase air oxidation process - a recipe for disaster // Process Safety Env. Prot. - 1990. - Vol. 68B. - N 1. - P. 17-23.

  3. Veser G., Schmidt L.D. Ignition and extinction in the catalytic oxidation of hydrocarbons over platinum // AIChE J. - 1996 - 42. - P. 1077-1087.

  4. Chen J.R., Lee C.M. Safe acetoxylation of propylene: the role of oxygen // Process Safety Progress. - 2005. - Vol. 24. - N 4. - P. 280-286.

  5. Crowl D.A., Louvar J.F. Chemical process safety: fundamentals with applications. - Upper Saddle River, New Jersey: Prentice Hall PTP, 2002.

  6. Mitropetros K., Fomin P.A., Steinbach J., Plewinsky B., Hieronymus H. Explosion of oxygen bubbles in cyclohexane. // Chemical Engineering Journal. -2004. - Vol. 97. -N 2-3. - P. 151-160.

  7. Fomin P.A., Mitropetros K.P., Hieronymus H. Explosion limits of a single oxygen containing bubble in organic solvent with high saturated vapor pressure // Proceedings of 11th International Symposium of Loss Prevention and Safety Promotion in the Process Industries (Loss Prevention 2004). - Prag, Chech Republic, 2004. - P. 21792185.

  8. Fomin P.A., Mitropetros K., Hieronymus, H. Modeling of detonation processes in chemically active bubble systems at normal and elevated initial pressures // Journal of Loss Prevention in the Process Industries. - 2003. - Vol. 16. - N 4. - P. 323-331.

  9. Fomin P.A., Mitropetros K., Hieronymus H. Theoretical analysis of shock induced bubble explosion with long ignition delay // Proceedings of European Combustion Meeting (ECM 2005), CD-ROM. - Belgium, Louvain-la-Neuve, 2005.

  10. Nikolaev Yu.A., Fomin P.A. Approximate equation of kinetics in heterogeneous systems of gas-condensed-phase type // Combustion, Explosion and Shock Waves. -1983. - Vol. 19. - N 6. - P. 737745.

  11. Fomin P.A., Mitropetros K., Hieronymus H. Approximate model of chemical equilibrium in heterogeneous gas-particles mixtures // Proceedings of the 4th International Seminar on Fire and Explosion Hazards, Bradley D., Drysdale D., Molkov V. (Eds.), ISBN 1 85923 186 1, FireSERT, University of Ulster, N. Ireland, UK, 2004. - P. 219228.

  12. Зельдович Я.Б., Райзер Ю.П. Физика ударных волн и высокотемпературных гидродинамических явлений. - М.: Наука, 1966.

  13. Pinaev A.V., Sychev A.I. Structure and properties of detonation in a liquid-gas bubble system // Combustion, Explosion and Shock Waves. - 1986. -1986. - Vol. 22. -N 3. - P. 360-368.

  14. Mitropetros, K. (2005) Shock induced bubble explosions in liquid cyclohexane. - Berlin.: BAM-Dissertationsreihe, Band 11, 2005.

  15. Лаврентьев М.А., Шабат Б.В. Проблемы гидродинамики и их математические модели. - М.: Наука, 1973.

  16. Frank-Kamenetsky D.A. Diffusion and Heat Transfer in Chemical Kinetics. - Мoscow: Nauka, 1967. - 492 pp.

 

 
     

© SPIC "Kappa", LLC 2009-2016