Combustion fluctuation mechanism involving cycle-to-cycle spark ignition variation due to gas flow motion in S.I. Engines

Hamai, Kyugo; Kawajiri, Hiroki; Ishizuka, Takashi; Nakai, Masato

doi:10.1016/s0082-0784(88)80279-0

Cited by 43 publications

(9 citation statements)

References 5 publications

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“…Failed events can be attributed to lean mixtures at the spark location, possibly caused by mixing of the fresh charge with trapped gases from the previous cycle, which hence necessitate very high energy to ignite [240]. The cycle-to-cycle variability in stratifiedcharge engines may also be related to the mixture composition at the spark location at the spark instant [241].…”

Section: Spark Ignition Of Turbulent Premixed Flowsmentioning

confidence: 99%

Ignition of turbulent non-premixed flames

Mastorakos

2009

Progress in Energy and Combustion Science

605

328

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Section: Spark Ignition Of Turbulent Premixed Flowsmentioning

confidence: 99%

Ignition of turbulent non-premixed flames

Mastorakos

2009

Progress in Energy and Combustion Science

605

328

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“…Hamai et al [1] showed that incomplete mixing of fuel/air and residual contribute to cycle to cycle variation in combustion. Also, the increase of residuals resulted in increased cyclic pressure variability.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of inlet manifold of a four stroke petrol engine by increasing tumble flow rate and reducing air pollution using aerofoil plate

Rajendran

Purushothaman

2015

mech

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“…The spark discharge characteristics [2], the local equivalence ratio of the mixture and its inhomogeneity close to the spark plug [2,7,8], turbulence in the vicinity of spark plug at the ignition time [8], and mixture temperature and pressure at the time of ignition [8] are all related with the variations of the early flame kernel development. On the other hand, the overall equivalence ratio [9], the extent of mixture homogeneity [10,11], the percentage of the residual gas fraction of the mixture [10] and the averaged turbulence intensity [12][13][14][15][16] are factors that affect the main flame propagation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Cycle-to-Cycle Variability of NO in Homogeneous Combustion

Karvountzis-Kontakiotis

Ntziachristos

2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-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.Re´sume´-Enqueˆte de la variabilite´cycle-a`-cycle du NO dans la combustion homoge`neLa variabilite´cyclique des moteurs a`allumage commande´est reconnue comme une dispersion dans les enregistrements des parame`tres de combustion lors du fonctionnement re´el dans des conditions stables. Des variabilite´s de combustion peuvent se produire en raison des fluctuations dans le de´veloppement pre´coce du noyau de la flamme et dans la propagation turbulente de la flamme avec un impact sur la consommation de carburant et les e´missions. Cette e´tude pre´sente un mode`le chimique de´taille´pour pre´voir la formation de NO dans des conditions de combustion homoge`ne. Le parame´trage de Wiebe est utilise´pour pre´voir le de´gagement de chaleur ; les donne´es thermodynamiques calcule´es sont ensuite inte´gre´es au mode`le chimique pour pre´voir l'e´volution de NO a`chaque degre´d'angle de rotation du vilebrequin. Les donne´es expe´rimentales obtenues a`partir de l'analyse des publications ante´rieures ont e´te´utilise´es pour valider les niveaux moyens de NO calcule´s. Le mode`le a ensuite e´te´applique´pour pre´voir l'impact de la variabilite´cyclique sur le taux moyen de NO forme´et l'amplitude de sa variation. La variabilite´cyclique a e´te´simule´e en introduisant des perturbations ale´atoires qui suivent une distribution normale, aux parame`tres de la fonction de Wiebe. Les re´sultats de cette approche montrent que le mode`le propose´pre´dit mieux le taux moyen de formation de NO que les me´thodes pre´ce´dentes. Les re´sultats montrent e´galement qu'une vitesse de formation non line´aire de NO avec la tempe´rature et la variation cyclea`-cycle, entraıˆne une moyenne plus e´lev...

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Combustion fluctuation mechanism involving cycle-to-cycle spark ignition variation due to gas flow motion in S.I. Engines

Cited by 43 publications

References 5 publications

Ignition of turbulent non-premixed flames

Ignition of turbulent non-premixed flames

Design and analysis of inlet manifold of a four stroke petrol engine by increasing tumble flow rate and reducing air pollution using aerofoil plate

Investigation of Cycle-to-Cycle Variability of NO in Homogeneous Combustion

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