The onset of knock in gas fuelled spark ignition engines prediction and experiment

• Autorzy: Karim G. A.
• Języki publikacji: EN

Abstrakty

EN

An approach for predicting the onset of knock and estimating its intensity in spark ignition engines is described. It is based on evaluating a dimensionless energy functional group, Kn, formulated to provide a numerical criterion to test continually, while using predictive models of the performance of spark ignition engines, for the onset of knock and its relative intensity at any instant during the combustion process. The basis for the derivation of this knock criterion and its significance are described. Examples involving gaseous fuels and their mixtures under different operating conditions show how the criterion can be employed for the prediction of the onset of knock and the associated knock-limited performance. It is shown that this approach can be made an integral part of modeling spark ignition engine operation to be used for optimizing engine performance while ensuring throughout the avoidance of the onset of knock. Among other things variations relative energy release and end gas mass fraction during flame propagation for non-knocking and border line knocking conditions, variations in the calculated knock criterion value with time for knock free, light and heavy knocking conditions, with compression ratio for hydrogen and methane as a fuel CFR engine, calculated optimum spark timing maximum power variation the probability of the incidence of knock versus spark timing, the suppression of the onset of knock through lean operation or cooled EGR are illustrated in the paper.

Słowa kluczowe

EN

combustion engine; gas engine modelling; engine performance knock criterion

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2007
• Tom: Vol. 14, No. 4
• Strony: 165--175
• Opis fizyczny: Bibliogr. 18 poz., rys.

Twórcy

autor

Karim G. A.

• Mechanical Engineering, Schulich School of Engineering University of Calgary, Calgary-Canada, T2N1N4,

Bibliografia

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• [14] Li, Hailin, Karim, G.A., 2003, Hydrogen Fuelled Spark-Ignition Engines: Predictive and Experimental Performance, ASME-ICES-0548.
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• [16] Bade Shrestha, Karim, G. A., 2001, An Experimental and Analytical Examination of the Combustion Period for Gas-fuelled Spark Ignition Engine Applications, Proc. Inst. of Mech. Eng., J. of Power and Energy, Vol. 215, pp. 63-73.
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• [18] Bade Shrestha, Karim, G.A., 2001, Considering the Effects of Cyclic Variations when Modeling the Performance of a Spark ignition Engine, SAE paper No. 2001-01-3600.