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The effect of a stepped lip piston design on performance and emissions from a high-speed diesel engine

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  • Leach, Felix
  • Ismail, Riyaz
  • Davy, Martin
  • Weall, Adam
  • Cooper, Brian

Abstract

Understanding engine-out NOx and soot emissions from light-duty diesel engines is vital for improving combustion system design and ultimately for reducing aftertreatment requirements. In this work two piston bowl shapes, a standard re-entrant bowl and a bowl with a stepped lip, are tested experimentally and numerically at two part-load operating points (1500 rpm/6.8 bar net IMEP and 1750 rpm/13.5 bar net IMEP), and four full-load operating points (1500, 2000, 3000, and 4000 rpm). The results show that the stepped lip design consistently increases the 50–90% MFB duration across all operating conditions due to the trapping of the flame in the region of the stepped lip. Use of the stepped bowl allowed injection timing to be advanced at full load, a condition constrained, in this work, by strict limits of cylinder pressure and exhaust temperature. However, despite these changes in combustion behavior engine out emissions were found to be largely insensitive to the bowl shape. No statistical difference in NOx and soot emissions between the two bowl geometries was observed at part load. A minor penalty in NOx emissions, statistically significant at ∼67% CI, is reported for the stepped bowl design at some full load points.

Suggested Citation

  • Leach, Felix & Ismail, Riyaz & Davy, Martin & Weall, Adam & Cooper, Brian, 2018. "The effect of a stepped lip piston design on performance and emissions from a high-speed diesel engine," Applied Energy, Elsevier, vol. 215(C), pages 679-689.
    • Handle: RePEc:eee:appene:v:215:y:2018:i:c:p:679-689
    DOI: 10.1016/j.apenergy.2018.02.076
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    References listed on IDEAS

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    1. S., d'Ambrosio & A., Ferrari, 2018. "Diesel engines equipped with piezoelectric and solenoid injectors: hydraulic performance of the injectors and comparison of the emissions, noise and fuel consumption," Applied Energy, Elsevier, vol. 211(C), pages 1324-1342.
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    Cited by:

    1. Doppalapudi, A.T. & Azad, A.K. & Khan, M.M.K., 2021. "Combustion chamber modifications to improve diesel engine performance and reduce emissions: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 152(C).
    2. Federico Millo & Andrea Piano & Benedetta Peiretti Paradisi & Mario Rocco Marzano & Andrea Bianco & Francesco C. Pesce, 2020. "Development and Assessment of an Integrated 1D-3D CFD Codes Coupling Methodology for Diesel Engine Combustion Simulation and Optimization," Energies, MDPI, vol. 13(7), pages 1-21, April.
    3. Ferrari, A. & Novara, C. & Paolucci, E. & Vento, O. & Violante, M. & Zhang, T., 2018. "Design and rapid prototyping of a closed-loop control strategy of the injected mass for the reduction of CO2, combustion noise and pollutant emissions in diesel engines," Applied Energy, Elsevier, vol. 232(C), pages 358-367.
    4. Yousefi, Amin & Guo, Hongsheng & Birouk, Madjid, 2020. "Split diesel injection effect on knocking of natural gas/diesel dual-fuel engine at high load conditions," Applied Energy, Elsevier, vol. 279(C).
    5. Pastor, José V. & García, Antonio & Micó, Carlos & Lewiski, Felipe & Vassallo, Alberto & Pesce, Francesco Concetto, 2021. "Effect of a novel piston geometry on the combustion process of a light-duty compression ignition engine: An optical analysis," Energy, Elsevier, vol. 221(C).
    6. Jena, Ashutosh & Singh, Akhilendra Pratap & Agarwal, Avinash Kumar, 2022. "Optical and computational investigations of the effect of Spray-Swirl interactions on autoignition and soot formation in a compression ignition engine fuelled by Diesel, dieseline and diesohol," Applied Energy, Elsevier, vol. 324(C).
    7. Zhao, Xiaohuan & Liu, Fang & Wang, Chunhua, 2022. "Effects of different piston combustion chamber heights on heat transfer and energy conversion performance enhancement of a heavy-duty truck diesel engine," Energy, Elsevier, vol. 249(C).
    8. Leach, Felix & Ismail, Riyaz & Davy, Martin, 2018. "Engine-out emissions from a modern high speed diesel engine – The importance of Nozzle Tip Protrusion," Applied Energy, Elsevier, vol. 226(C), pages 340-352.

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