Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지

Intake Valve Temperature Effect on the Mixture Preparation in a SI Engine During Warm-up

  • 신영기 (정회원, Massachusetts Institute of Technology Sloan Automotive Laboratory, Cambridge MA, U.S.A.)
  • Published : 1997.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

A heat transfer model of the intake valve in a spark ignition engine is presented, which is calibrated with a number of the valve temperature profiles measured during engine warm-up for the gaseous fuel(propane). The valve is divided into four identical elements for which the assumption of lumped thermal mass is applied. The calibration is made so that the difference between the measued and simulated valve temperatures becomes minimal. Then the model is applied to the cases of the liquid fuel(indolene) to estimate the amount of the liquid fuel vaporized from the intake valve by assuming that fuel evaporation accounts for the deficit of the heat balance budget. The results of the model show quantitative contribution of each heat transfer source to the heat balance. The behavior of the calculated mass fraction of the fuel vaporized from the intake valve explains how the liquid fuel evaporate during engine warm-up. The mass fraction at warmed-up condition is closely related with the fraction directly targeted on the valve back by the fuel spray geometry.

Keywords

References

  1. SAE Paper 880691 Transient A/F characteristics for cold operation of a 106 liter engine with sequential fuel injection Fozo;C. Aquino
  2. SAE Paper 952478 Emissions reduction during warm-up period by incorporating a wall-wetting fuel model on the fuel injection strategy during engine starting K. Horie;H. Takahasi;S. Akazaki
  3. Hea transfer A. F. Mills
  4. SAE paper 670931, SAE Trans. v.76 Universally applicable equation for the instantaneous heat transfer in the cylinder of a high speed diesel engine G. Woschni
  5. J. Heat Transfer v.102 Heat transfer characteristics of a spark ignition engine A. C. Alkidas
  6. SAE paper 670479 The effect of heat transfer on the steady flow through a poppet valve D. N. Kapadia;G. L. Borman
  7. SAE paper 700501 Correlation of convective heat transfer for steady intake-flow through a poppet valve G. T. Engh;C. Chinang
  8. Int. J. Heat Mass Transfer v.24 no.4 An experimental and analytical study of heat transfer in an engine exhaust port J. A. Caton;J. B. Heywood
  9. Internal combustion engine fundamentals J. H. Heywood
  10. SAE paper 720112, SAE Trans v.81 Time-resolved measurements of Hydrocarbon mass flow rate in the exhaust of a spark-ignition engine R. J. Tabaczynski;J. B. Heywood;J. C. Keck
  11. MTZ v.43 Experimental investigation of the heat transfer at normal and knocking combustion in spark ignition engines G. Woschni;J. Fieger
  12. SAE paper 941877 A sepciesbased multi-component volatility model for gasline K. C. Chen;K. DeWitte;W. K. Cheng
  13. I& EC Fund v.15 A new two-constant eqution of state D. Y. Peng;D. B. Robinson
  14. SAE paper 900583 Heat transfer to air-ethanol and air-methanol sprays flowing in heated ducts and across heated intake valves J. J. G. Martins;I. C. Finlay
  15. SAE paper 920518 Fuel preparation in port-injected engines J. J. G. Martins;I. C. Finlay