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

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

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 languageEnglish
Pages (from-to)371-390
JournalCombustion Science and Technology
Volume180
Issue number2
DOIs
Publication statusPublished - 2008

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