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Abstract

An investigation is performed to determine quantitatively the departures from ideal behaviour that can be expected in pressure-volume-temperature (P-V-T) relationships, internal energy departures, relevant thermo-dynamic partial derivatives, droplet vaporization and spray development in high-pressure environments typical of diesel engine conditions. All of the necessary modifications have been added to the KIVA-3V code. The equation of state employed is the Peng-Robinson equation. Results show that as the fraction of air increases in a fuel/air mixture the departure from ideal behaviour in P-V-T relationships is lessened. The largest deviation from ideal predictions in spray development is attributed to a significant underprediction of the vaporization rate at high pressures (P ≫ P_c) and relatively low temperatures (T ≈ T_c). Thermodynamic partial derivatives can also show deviations from ideal behaviour even when the compressibility factor Z is equal to one.

Keywords

high-pressure multicomponent liquid sprays ideal behaviour diesel engine

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High-pressure multicomponent liquid sprays: Departure from ideal behaviour

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