On the impact of the ideal gas assumption to high-pressure combustion phenomena in engines

A.V. Evlampiev; L.M.T. Somers; R.S.G. Baert; L.P.H. Goey, de

doi:10.1080/00102200701740873

On the impact of the ideal gas assumption to high-pressure combustion phenomena in engines

A.V. Evlampiev, L.M.T. Somers, R.S.G. Baert, L.P.H. Goey, de

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Abstract

The effect of the ideal gas law assumption on auto-ignition and NOx-formation in a rapid compression machine is studied. For both processes the simulations are compared to a reference simulation using a Redlich-Kwong equation-of-state based on the critical properties of all constituents. Auto-ignition is studied for several n-heptane/air mixtures and the results show that the ideal gas assumption can impose large deviations. However, only marginal differences (<7%) appear if the pressure history is used. A simplified theory is presented that explains these observations. For the case of NOx-formation similar observations can be made. Large deviations from the full simulation occur for the case of a prescribed pressure and volume history (approximately 100%). This, however, is mainly due to the fact that in engine like applications NOx concentrations never reach their equilibrium value. Equilibrium values only differ by a maximum of 20%.

Original language	English
Pages (from-to)	371-390
Journal	Combustion Science and Technology
Volume	180
Issue number	2
DOIs	https://doi.org/10.1080/00102200701740873
Publication status	Published - 2008

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title = "On the impact of the ideal gas assumption to high-pressure combustion phenomena in engines",

abstract = "The effect of the ideal gas law assumption on auto-ignition and NOx-formation in a rapid compression machine is studied. For both processes the simulations are compared to a reference simulation using a Redlich-Kwong equation-of-state based on the critical properties of all constituents. Auto-ignition is studied for several n-heptane/air mixtures and the results show that the ideal gas assumption can impose large deviations. However, only marginal differences (<7%) appear if the pressure history is used. A simplified theory is presented that explains these observations. For the case of NOx-formation similar observations can be made. Large deviations from the full simulation occur for the case of a prescribed pressure and volume history (approximately 100%). This, however, is mainly due to the fact that in engine like applications NOx concentrations never reach their equilibrium value. Equilibrium values only differ by a maximum of 20%.",

author = "A.V. Evlampiev and L.M.T. Somers and R.S.G. Baert and {Goey, de}, L.P.H.",

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T1 - On the impact of the ideal gas assumption to high-pressure combustion phenomena in engines

AU - Evlampiev, A.V.

AU - Somers, L.M.T.

AU - Baert, R.S.G.

AU - Goey, de, L.P.H.

PY - 2008

Y1 - 2008

N2 - The effect of the ideal gas law assumption on auto-ignition and NOx-formation in a rapid compression machine is studied. For both processes the simulations are compared to a reference simulation using a Redlich-Kwong equation-of-state based on the critical properties of all constituents. Auto-ignition is studied for several n-heptane/air mixtures and the results show that the ideal gas assumption can impose large deviations. However, only marginal differences (<7%) appear if the pressure history is used. A simplified theory is presented that explains these observations. For the case of NOx-formation similar observations can be made. Large deviations from the full simulation occur for the case of a prescribed pressure and volume history (approximately 100%). This, however, is mainly due to the fact that in engine like applications NOx concentrations never reach their equilibrium value. Equilibrium values only differ by a maximum of 20%.

AB - The effect of the ideal gas law assumption on auto-ignition and NOx-formation in a rapid compression machine is studied. For both processes the simulations are compared to a reference simulation using a Redlich-Kwong equation-of-state based on the critical properties of all constituents. Auto-ignition is studied for several n-heptane/air mixtures and the results show that the ideal gas assumption can impose large deviations. However, only marginal differences (<7%) appear if the pressure history is used. A simplified theory is presented that explains these observations. For the case of NOx-formation similar observations can be made. Large deviations from the full simulation occur for the case of a prescribed pressure and volume history (approximately 100%). This, however, is mainly due to the fact that in engine like applications NOx concentrations never reach their equilibrium value. Equilibrium values only differ by a maximum of 20%.

U2 - 10.1080/00102200701740873

DO - 10.1080/00102200701740873

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VL - 180

SP - 371

EP - 390

JO - Combustion Science and Technology

JF - Combustion Science and Technology

IS - 2

ER -

On the impact of the ideal gas assumption to high-pressure combustion phenomena in engines

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