Vapor Pressure Equations for Characterizing Automotive Fuel Behavior Under Hot Fuel Handling Conditions

Vapor Pressure Equations for Characterizing Automotive Fuel Behavior Under Hot Fuel Handling Conditions

A simple set of equations has been developed to characterize automotive fuel behavior in fuel tanks, fuel vapor systems and fuel rails, particularly under hot weather conditions. The system of equations links the vapor pressure P, the temperature T, and the mass fraction evaporated Z. Parameters are...

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Veröffentlicht in:SAE transactions 1997-01, Vol.106, p.572-581
Hauptverfasser: Lavoie, George A., Smith, Carol S.
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Smith, Carol S.
description A simple set of equations has been developed to characterize automotive fuel behavior in fuel tanks, fuel vapor systems and fuel rails, particularly under hot weather conditions. The system of equations links the vapor pressure P, the temperature T, and the mass fraction evaporated Z. Parameters are determined empirically from laboratory vapor pressure and distillation tests. With appropriate values for heat capacity, heat of vaporization, and vapor composition, the equations can be used to estimate upper flammability limits, fuel weathering under hot fuel handling conditions, pressure rise in tanks, and evaporative vapor generation. The equations were developed as part of a larger fuel vapor system model.
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The system of equations links the vapor pressure P, the temperature T, and the mass fraction evaporated Z. Parameters are determined empirically from laboratory vapor pressure and distillation tests. With appropriate values for heat capacity, heat of vaporization, and vapor composition, the equations can be used to estimate upper flammability limits, fuel weathering under hot fuel handling conditions, pressure rise in tanks, and evaporative vapor generation. 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title Vapor Pressure Equations for Characterizing Automotive Fuel Behavior Under Hot Fuel Handling Conditions
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