The thermodynamic system “fuel tank of a vehicle” energy model. Processes of unsteady heat transfer at constant fuel mass

Ter-Mkrtich’yan, G. G.; Mikerin, N. A.; Glaviznin, V. V.; Balashov, D.Yu.; Arabyan, M. E.

doi:10.51187/0135-3152-2020-4-82-93

Труды НАМИ

2020

DOI: 10.51187/0135-3152-2020-4-82-93

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The thermodynamic system “fuel tank of a vehicle” energy model. Processes of unsteady heat transfer at constant fuel mass

G. G. Ter-Mkrtich’yan

N. A. Mikerin

V. V. Glaviznin

et al.

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Cited by 4 publications

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Analysis of the vaporization processes in the vehicle fuel tank. New equation for determining the vapor amount

Тер-Мкртичьян

2021

Trudy NAMI

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Introduction (problem statement and relevance). Hydrocarbon emissions from vaporizationtank fuel contribute significantly to the total emissions of hazardous substances from vehicles equipped with spark ignition engines. To meet the established standards for limiting hydrocarbon emissions caused by evaporation, all modern vehicles use fuel vapor recovery systems, the optimal parameters of which require the availability and application of mathematical models and methods for their determination.The purpose of the research was to develop a model of vapor generation processes in the car fuel tank and a methodology for determining the main quantitative parameters of the vapor-air mixture.Methodology and research methods. The analysis of the processes of vapor generation in the fuel tank was carried out. It was shown that the mass of hydrocarbons generated in the steam space was directly proportional to its volume and did not depend on the amount of fuel in the tank.Scientific novelty and results. New analytical dependences of the vaporization amount on the saturated vapor pressure, barometric pressure, initial fuel temperature and fuel heating during parking have been obtained.Practical significance. A formula was obtained to estimate the temperature of gasoline boiling starting in the tank, depending on the altitude above sea level and the volatility of gasoline, determined by the pressure of saturated vapors. Using the new equations, the vaporization analysis in real situations (parking, idling, refueling, explosive concentration of vapors) was carried out.

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Analysis of the vaporization processes in the vehicle fuel tank. New equation for determining the vapor amount

Тер-Мкртичьян

2021

Trudy NAMI

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Generalized energy model of the open thermodynamic system “vehicle fuel tank”. Processes of non-stationary heat transfer with a variable fuel mass

et al. 2022

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Introduction (statement of the problem and relevance). While gasoline-powered vehicles generate a signiﬁcant amount of hydrocarbons in the form of the fuel system emitted vapors, the main element of the system being the fuel tank, modern requirements for evaporative emission limits are signiﬁcantly tightened. At the same time, the vaporization process parameters and the fuel vapor amount are determined by the dynamics of fuel heating in the tank under various modes of vehicle operation.The purpose of the research was to develop a “vehicle fuel tank” energy model, seeking to create an open thermodynamic system which can exchange matter and energy with the environment depending on the variable amount of fuel in the tank.Methodology and research methods. The analysis of heat ﬂush connected to the fuel tank and taken away from it was being carried out. As a result of solving equations for open and closed thermodynamic systems, the parameters characterizing the thermal properties of the fuel tank were obtained.Scientiﬁc novelty and results. Additional complex parameters have been proposed, the main of which are: heat transfer of the tank; tank heat capacity; supplied heat ﬂux; the rate of heat capacity change; tank emptying time; fuel heating acceleration factor; the maximum rate of change in temperature difference. To assess the heat and power properties of the fuel tank, an additional parameter of the sphere surface area ratio to the surface area of the same volume tank has been proposed, which allowed estimating the fuel tank heat transfer to the environment.Practical signiﬁcance. Equations have been obtained that allow estimating the level of fuel temperature depending on the thermal properties and shape of the fuel tank in the absence and presence of fuel pump control.

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Optimization of the gas-air path system parameters for trapping automotive fuel vapors

et al. 2022

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Introduction (statement of the problem and parameters relevance). The composition of the mixture of air and gasoline vapors differs in air and vapors ratio when purging the absorber at different time of the car operation. Therefore, the air-fuel mixture entering the engine for afterburning can create uncertainties in lambda control.The purpose of the research was to determine the main features of lambda regulation in an unstable fuel-air mixture.Methodology and research methods. An analysis of the mixed air and fuel vapor flows entering the engine during absorber purge was made. The composition and quantity effect of this mixture on the excess air coefficient was determined. The main parameters of air and gasoline vapor mixture in the fuel tank vapor space were established.Scientific novelty and results. An equation obtained testifies that the excess air coefficients in the flows of the fuel-air mixture relate to the mixture flow rate during absorber purge. The requirements for the composition of the fuel-air mixture leaving the absorber have been formulated. In order not to exceed these values the threshold values of short-term fuel supply were corrected and the relative mass flow value rate of gasoline vapors from the tank in relation to the air flow rate purge was determined.Practical significance. The factors limiting the flow sections of the absorber gas-air paths and the optimal ratios of the flow sections were determined on the example of a two-chamber absorber to exclude excessive enrichment of the fuel-air mixture entering the engine during purge.

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The thermodynamic system “fuel tank of a vehicle” energy model. Processes of unsteady heat transfer at constant fuel mass

Cited by 4 publications

References 0 publications

Analysis of the vaporization processes in the vehicle fuel tank. New equation for determining the vapor amount

Analysis of the vaporization processes in the vehicle fuel tank. New equation for determining the vapor amount

Generalized energy model of the open thermodynamic system “vehicle fuel tank”. Processes of non-stationary heat transfer with a variable fuel mass

Optimization of the gas-air path system parameters for trapping automotive fuel vapors

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