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SR11 Máquinas Térmicas, Ciclos Termodinâmicos e Propulsão |
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Title:
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INFLUENCE OF CHOKE USE ON FUEL VAPORIZATION INSIDE THE INTAKE MANIFOLD OF ETHANOL AND ETHANOL-GASOLINE BLEND FUELD ENGINES DURING COLD START
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Summary :
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ABSTRACT. COLD START TESTS WERE ACCOMPLISHED IN AN OTTO TYPE CARBURETOR ENGINE USING ETHANOL AND ETHANOL-GASOLINE BLENDS AND THE FRACTION OF FUEL VAPORIZED IN THE INTAKE MANIFOLD DURING THE PERIOD WAS DETERMINED. ENGINE BLOCK, AIR AND FUEL SUPPLY WERE COOLED DOWN AND THE TESTS WERE ACCOMPLISHED FOR TEMPERATURES BETWEEN 9?AND 23°C. THE TESTS INDICATED THAT FOR TEMPERATURES UNDER 13°C, THE ENGINE COLD START PROCESS GETS VERY DIFFICULT USING ONLY ETHANOL DUE TO ITS HIGH LATENT HEAT OF VAPORIZATION AND, IN THIS CASES, THE USE OF ETHANOL-GASOLINE BLENDS IS NECESSARY. IT WAS VERIFIED THAT THE FRACTION OF VAPORIZED FUEL AND THE COLD START SUCCESS OR FAILURE ARE DIRECTLY RELATED TO AMBIENT TEMPERATURE AND THE CHARACTERISTICS OF THE USED FUEL. IT WAS CONCLUDED THAT AFV VALUES HIGHER THAN 150:1 IN THE INTAKE MANIFOLD ALWAYS IMPLIED IN ENGINE COLD START FAILURE.
KEY WORDS: COLD START, ETHANOL, ETHANOL-GASOLINE BLENDS, INTERNAL COMBUSTION ENGINES, VAPORIZATION.
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Author :
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ÁVILA, MÁRCIO T.
FEITOSA, MARCELO VALENTE
HILDEBRAND JÚNIOR, LEÔNIDAS 0
SANTOS, ANTONIO MOREIRA
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Paper View :
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