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Intake Manifold Fuel Film Transient Dynamics
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English
Abstract
This paper presents an analytical study of intake manifold fuel film transient behaviour. It is shown that the overall film response after a step change in airflow consists of two disturbances. A transverse wave imposes the new shear stress distribution, starting at the film surface and moving down through the film towards the wall normal to the film flow direction. A longitudinal wave advances down the length of the manifold parallel to film flow direction.
The transverse wave is much faster than the longitudinal wave, is independent of air and fuel velocities and penetrates the film at a rate dependent only upon kinematic viscosity. The longitudinal wave depends upon new and old steady state conditions as well as fluid properties, and usually dominates the overall film response because of its much slower reaction. The model is used to examine transient engine behaviour, particularly under cold conditions.
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Authors
- M.F. Bardon - Department of Mechanical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
- V.K. Rao - Department of Mechanical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
- D.P. Gardiner - Department of Mechanical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
Citation
Bardon, M., Rao, V., and Gardiner, D., "Intake Manifold Fuel Film Transient Dynamics," SAE Technical Paper 870569, 1987, https://doi.org/10.4271/870569.Also In
SAE 1987 Transactions Alternative Engines and Engine Components and Systems
Number: V96-5; Published: 1988-09-01
Number: V96-5; Published: 1988-09-01
References
- Servati H.B. Yuen W.W. “Deposition of Fuel Droplets in Horizontal Intake Manifolds and the Behaviour of Fuel Film Flow on Its Walls” SAE paper # 840239 International Congress and Exposition Detroit Feb 27-Mar 24, 1984
- Trayer D.A. Gieseke J.A. Fischer R.D. Creswick F.A. “A Study of the Influence of Fuel Atomization, Vaporization and Mixing Processes on Pollutant Emissions form Motor-Vehicle Power-plants - Phase II Report” Report #APTO-0964 Battelle Columbus Laboratories Columbus Jan 31 1972
- Gardiner D.P. Bardon M.F. “Mixture Maldistribution Due to Manifold Films in a Methanol Fuelled S.I. Engine” SAE paper # 860234 International Congress and Exposition Detroit Feb 24-28, 1986
- Nichols R.J. “Further Development of the Methanol-Fuelled Escort” paper # 830900 Proc 2nd SAE Int. Pacific Conference Tokyo Nov 6-10, 1983
- Goodger E.M. “Comparative Properties of Conventional and Alternative Fuels” Vol. 2 of Alternative Fuels Technology Series Cranfield Press Cranfield, Bedford, England 1982
- Rose J.W. Cooper J.R. Technical Data on Fuel Wiley N.Y. 1977