Evaluation of the Influence of Injector Type in a Four-Valve Engine

Brehm, Christoph; Carabateas, N.; Cousyn, B.; Mangano, R.; Neveu, Fabrice; Posylkin, M.; Whitelaw, J. H.

doi:10.4271/961998

Cited by 9 publications

(2 citation statements)

References 11 publications

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“…The wall fuel film thickness is a critical variable, not only for steady state operation but also for transient response, with Brehm et al [5] identifying an in-cylinder fuel deficiency of 12 per cent during transient operation for the case of the closed-valve injection strategy. Returning to Fig.…”

Section: Injection Strategiesmentioning

confidence: 99%

“…in vapour distribution and the potential for mixture stratification through fuel entrainment in the recirculation zones formed within the exhaust valve side. In terms of maximum combustion pressure and the associated values of coefficient of variation (COV), this early injection strategy has proven to be superior by demonstrating the desired mixture stability and potential for control of mixture stratification, but without the adverse effects of increased hydrocarbon emissions and poorer combustion performance observed by Brehm et al [5]. Since a fixed ignition timing was employed for each equivalence ratio sweep, the increased by 10 per cent maximum pressure for the air±fuel ratio of 24:1, together with the slightly higher NO x emissions, suggest faster early flame propagation together with an enhanced probability of mixture stratification, thus offering a more favourable equivalence ratio for combustion within the spark gap [15].…”

Section: Combustion and Emissionsmentioning

confidence: 99%

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Mixture preparation strategies in an optical four-valve port-injected gasoline engine

Gold

Arcoumanis

Whitelaw

et al. 2000

International Journal of Engine Research

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The mixture formation in a single-cylinder, optical port-injected gasoline engine was investigated for both closed- and open-valve injection strategies with a combination of phase Doppler anemometry, laser-induced fluorescence and Mie scattering and correlated with combustion development and exhaust emissions. Detailed crank angle resolved data of the flow and mixture distribution during induction and compression have revealed the advantages of early open-valve injection, in terms of extending the lean limit and maintaining satisfactory engine performance and HC/NOx emissions, achieved through charge stratification in the vicinity of the spark plug at the time of ignition.

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Section: Injection Strategiesmentioning

confidence: 99%

Section: Combustion and Emissionsmentioning

confidence: 99%

Mixture preparation strategies in an optical four-valve port-injected gasoline engine

Gold

Arcoumanis

Whitelaw

et al. 2000

International Journal of Engine Research

Self Cite

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Spray Characteristics in the Port and Cylinder of a Four-Valve Spark-Ignition Engine

Cousyn

Neveu

Posylkin

et al. 1997

Developments in Laser Techniques and Fluid Mechanics

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Combustion Characteristics of HCCI in Motorcycle Engine

Jang

Chen

2010

Journal of Engineering for Gas Turbines and Power

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Homogeneous charge compression ignition (HCCI) is recognized as an advanced combustion system for internal combustion engines that reduces fuel consumption and exhaust emissions. This work studied a 150 cc air-cooled, four-stroke motorcycle engine employing HCCI combustion. The compression ratio was increased from 10.5 to 12.4 by modifying the cylinder head. Kerosene fuel was used without intake air heating and operated at various excess air ratios (λ), engine speeds, and exhaust gas recirculation (EGR) rates. Combustion characteristics and emissions on the target engine were measured. It was found that keeping the cylinder head temperature at around 120–130°C is important for conducting a stable experiment. Two-stage ignition was observed from the heat release rate curve, which was calculated from cylinder pressure. Higher λ or EGR causes lower peak pressure, lower maximum rate of pressure rise (MRPR), and higher emission of CO. However, EGR is better than λ for decreasing the peak pressure and MRPR without deteriorating the engine output. Advancing the timing of peak pressure causes high peak pressure, and hence increases MRPR. The timing of peak pressure around 10–15 degree of crank angle after top dead center indicates a good appearance for low MRPR.

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Evaluation of the Influence of Injector Type in a Four-Valve Engine

Cited by 9 publications

References 11 publications

Mixture preparation strategies in an optical four-valve port-injected gasoline engine

Mixture preparation strategies in an optical four-valve port-injected gasoline engine

Spray Characteristics in the Port and Cylinder of a Four-Valve Spark-Ignition Engine

Combustion Characteristics of HCCI in Motorcycle Engine

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