Enqueˆte de la variabilit´ cycle-`-cycle du NO dans la combustion homog`ne

Translated title of the contribution: Investigation of cycle-to-cycle variability of NO in homogeneous combustion

A. Karvountzis-Kontakiotis, L. Ntziachristos

    Research output: Contribution to journalArticleScientificpeer-review

    5 Citations (Scopus)

    Abstract

    Cyclic variability of spark ignition engines is recognized as a scatter in the combustion parameter recordings during actual operation in steady state conditions. Combustion variability may occur due to fluctuations in both early flame kernel development and in turbulent flame propagation with an impact on fuel consumption and emissions. In this study, a detailed chemistry model for the prediction of NO formation in homogeneous engine conditions is presented. The Wiebe parameterization is used for the prediction of heat release; then the calculated thermodynamic data are fed into the chemistry model to predict NO evolution at each degree of crank angle. Experimental data obtained from literature studies were used to validate the mean NO levels calculated. Then the model was applied to predict the impact of cyclic variability on mean NO and the amplitude of its variation. The cyclic variability was simulated by introducing random perturbations, which followed a normal distribution, to the Wiebe function parameters. The results of this approach show that the model proposed better predicts mean NO formation than earlier methods. Also, it shows that to the non linear formation rate of NO with temperature, cycle-to-cycle variation leads to higher mean NO emission levels than what one would predict without taking cyclic variation into account.

    Translated title of the contributionInvestigation of cycle-to-cycle variability of NO in homogeneous combustion
    Original languageFrench
    Pages (from-to)111-123
    Number of pages13
    JournalOIL AND GAS SCIENCE AND TECHNOLOGY : REVUE DE L'INSTITUT FRANCAIS DU PETROLE
    Volume70
    Issue number1
    DOIs
    Publication statusPublished - 2015
    Publication typeA1 Journal article-refereed

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Fuel Technology
    • Energy Engineering and Power Technology

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