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Comparison of performance of a Greener direct-injection stratified-charge (DISC) engine with a spark-ignition engine using a simplified model

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  • Najjar, Yousef S.H.

Abstract

The direct-injection stratified charge (DISC) engine is a hybrid between spark ignition (SI) and compression-ignition engines, it combines many of the best features of both with some unique advantages of its own. This includes multi-fuel capability, high thermal efficiency, low NOx production, and low particulate emissions.This work shows how simple semi-global models can predict the performance of the SI and DISC engines with reasonable accuracy, without going to details of modeling for internal processes such as: swirl, mixing and detailed combustion kinetics.The operating variables studied were inlet manifold pressure pi, exhaust manifold pressure pe, engine speed N, equivalence ratio Φ, and volumetric efficiency ηv at different loads. The corresponding performance parameters were the brake mean effective pressure bmep, brake power Pb, and brake thermal efficiency ηb,th. The main contribution of this work is the production of friendly set of curve-fitting correlations for engine performance. The bmep and the Pb increase with the load for both engines. For spark ignition engines the bmep increases by about 70% when load increases from 50% to 100%. With the DISC engine, this ratio increases to 75%. The percent improvement in ηb,th for the DISC to the SI engine is around 50% which increases with part load, lower compression ratio rc and pi.

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  • Najjar, Yousef S.H., 2011. "Comparison of performance of a Greener direct-injection stratified-charge (DISC) engine with a spark-ignition engine using a simplified model," Energy, Elsevier, vol. 36(7), pages 4136-4143.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:7:p:4136-4143
    DOI: 10.1016/j.energy.2011.04.031
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    3. Paolo Sementa & Cinzia Tornatore & Francesco Catapano & Silvana Di Iorio & Bianca Maria Vaglieco, 2023. "Custom-Designed Pre-Chamber: Investigating the Effects on Small SI Engine in Active and Passive Modes," Energies, MDPI, vol. 16(13), pages 1-24, July.
    4. Costa, M. & Marchitto, L. & Merola, S.S. & Sorge, U., 2014. "Study of mixture formation and early flame development in a research GDI (gasoline direct injection) engine through numerical simulation and UV-digital imaging," Energy, Elsevier, vol. 77(C), pages 88-96.
    5. Park, Cheolwoong & Kim, Sungdae & Kim, Hongsuk & Moriyoshi, Yasuo, 2012. "Stratified lean combustion characteristics of a spray-guided combustion system in a gasoline direct injection engine," Energy, Elsevier, vol. 41(1), pages 401-407.
    6. Adrian Clenci & Adrian Bîzîiac & Pierre Podevin & Georges Descombes & Michael Deligant & Rodica Niculescu, 2013. "Idle Operation with Low Intake Valve Lift in a Port Fuel Injected Engine," Energies, MDPI, vol. 6(6), pages 1-18, June.
    7. Jiang, Chenxu & Li, Zilong & Qian, Yong & Wang, Xiaole & Zhang, Yahui & Lu, Xingcai, 2018. "Influences of fuel injection strategies on combustion performance and regular/irregular emissions in a turbocharged gasoline direct injection engine: Commercial gasoline versus multi-components gasoli," Energy, Elsevier, vol. 157(C), pages 173-187.
    8. Sun, Yao & Yu, Xiumin & Dong, Wei & Chen, Hong & Hu, Yunfeng, 2018. "Effect of split injection on particle number (PN) emissions in GDI engine at fast-idle through integrated analysis of optics and mechanics," Energy, Elsevier, vol. 165(PB), pages 55-67.
    9. Najjar, Yousef S.H. & Kseibi, Musaab M., 2017. "Thermoelectric stoves for poor deprived regions – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 597-602.

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