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An Evaluation of Local Heating as a Means of Fuel Evaporation for Gasoline Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1986 by SAE International in United States
Annotation ability available
The technique of evaporating fuel by localized heating before entering the intake manifold is evaluated as a means of improving A/F ratio control. Techniques currently in use are briefly discussed, and attempts to analyze fuel evaporation in S.I. engines are reviewed. A test fixture which includes all the essential features of production feasible hardware is used to develop a basis of understanding for the evaporation process. Tests are conducted on a flow bench using water as “fuel”, and on an engine using isooctane and gasoline. A heat-mass transfer analogy is described and used to predict evaporation rates for water and isooctane. Predicted and measured rates are compared for both bench and engine tests. Engine tests with gasoline show the ability of the test configuration to evaporate all part throttle fuel flow before it enters the intake manifold. Results are presented which show the ability of local heating to reduce A/F excursions on the 1.6 Liter engine by 80% over the ambient temperature range of 0°F to 70°F. Results showing the elimination of cylinder to cylinder A/F maldistribution are presented, and recommended operating temperatures and heat inputs for engine operation are also presented.
CitationAquino, C. and Plensdorf, W., "An Evaluation of Local Heating as a Means of Fuel Evaporation for Gasoline Engines," SAE Technical Paper 860246, 1986, https://doi.org/10.4271/860246.
- Bond W. D. “Quick-Heat Intake Manifolds for Reducing Cold Engine Emissions” SAE Paper No. 720935 1972
- Harned J. L. “Heat Pipe Early Fuel Evaporation” SAE Paper No. 760565 1976
- Berg P. G. “PTC Honeycomb Heater for Improved Fuel Vaporization” SAE Paper No. 810156 1981
- Brandstetter W. “The Volkswagen Lean Burn PC-Engine Concept” SAE Paper No. 800456 1980
- Koch H. Meyerdierks D. Golden J. “Volkswagen's Development of the New Carbureted Exhaust Emission Concept for Model Tear 1982” SAE Paper No. 830618 1983
- Aquino C. F. “The Effect of Local Heating on A/F Ratio Control” SAE Paper No. 820411 1982
- Yun H. J. Lo R. S. Na T. Y. “Theoretical Studies of Fuel Droplet Evaporation and Transportation in a Carburetor Venturi” SAE Paper No. 760289 1976
- Finlay J. C. Boam D. G. Bannell J. L. K. “Computer Model of Fuel Evaporation in Air Valve Carburetors” Automotive Engineer 4 6 December 1979
- Boam D. G. Finlay J. C. “A Computer Model of Fuel Evaporation in the Intake System of a Carburetted Petrol Engine” I. Mech. E. Conf. Publ. 1979-9 Fuel Economy and Emissions of Lean Burn Engines London, England 1979
- Pederson D. R. Eckert E. R. G. Goldstein R.J. “Film Cooling with Large Density Differences Between the Mainstream and the Secondary Fluid Measured by the Heat-Mass Transfer Analogy” Trans. ASME J. of Heat Transfer 99 November 1977 620 627
- Kays W. M. Crawford M. E. “Convective Heat and Mass Transfer” McGraw-Hill 1980
- VanWylen G. J. Sonntag R. E. “Fundamentals of Classical Thermodynamics” John Wiley 1965
- Lange's Handbook of Chemistry Dean J. A. McGraw-Hill 1979
- Chemical Engineer's Handbook fifth Perry R. H. Chilton C. H. McGraw-Hill
- Hsu Y. Y. Simon F. F. Lad J. F. “Destruction of a Thin Liquid Film Flowing Over a Heated Surface” Chem. Engr. Progr. Symposium Ser. No. 57 61 1965