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Starting to Unpick the Unique Air–Fuel Mixing Dynamics in the Recuperated Split Cycle Engine

Author

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  • Simon A. Harvey

    (Advanced Engineering Centre, University of Brighton Cockroft Building, Lewes Road, Brighton, East Sussex BN2 4GJ, UK
    Ricardo Innovations, Shoreham Technical Centre, Shoreham-by-Sea, West Sussex BN43 5FG, UK)

  • Konstantina Vogiatzaki

    (Advanced Engineering Centre, University of Brighton Cockroft Building, Lewes Road, Brighton, East Sussex BN2 4GJ, UK)

  • Guillaume de Sercey

    (Advanced Engineering Centre, University of Brighton Cockroft Building, Lewes Road, Brighton, East Sussex BN2 4GJ, UK)

  • William Redpath

    (Advanced Manufacturing Research Centre, University of Sheffield, Sheffield S60 5TZ, UK)

  • Robert E. Morgan

    (Advanced Engineering Centre, University of Brighton Cockroft Building, Lewes Road, Brighton, East Sussex BN2 4GJ, UK)

Abstract

In this work air fuel mixing and combustion dynamics in the recuperated split cycle engine (RSCE) are investigated through new theoretical analysis and complementary optical experiments of the flow field. First, a brief introduction to the basic working principles of the RSCE cycle will be presented, followed by recent test bed results relevant to pressure traces and soot emissions. These results prompted fundamental questioning of the air-fuel mixing and combustion dynamics taking place. Hypotheses of the mixing process are then presented, with differences to that of a conventional Diesel engine highlighted. Moreover, the links of the reduced emissions, air transfer processes and enhanced atomisation are explored. Initial experimental results and Schlieren images of the air flow through the poppet valves in a flow rig are reported. The Schlieren images display shockwave and Mach disk phenomena. Demonstrating supersonic air flow in the chamber is consistent with complementary CFD work. The results from the initial experiment alone are inconclusive to suggest which of the three suggested mixing mechanism hypotheses are dominating the air–fuel dynamics in the RSCE. However, one major conclusion of this work is the proof for the presence of shockwave phenomena which are atypical of conventional engines.

Suggested Citation

  • Simon A. Harvey & Konstantina Vogiatzaki & Guillaume de Sercey & William Redpath & Robert E. Morgan, 2021. "Starting to Unpick the Unique Air–Fuel Mixing Dynamics in the Recuperated Split Cycle Engine," Energies, MDPI, vol. 14(8), pages 1-20, April.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:8:p:2148-:d:534580
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    References listed on IDEAS

    as
    1. Coney, M.W. & Linnemann, C. & Abdallah, H.S., 2004. "A thermodynamic analysis of a novel high efficiency reciprocating internal combustion engine—the isoengine," Energy, Elsevier, vol. 29(12), pages 2585-2600.
    2. Jaya Madana Gopal & Giovanni Tretola & Robert Morgan & Guillaume de Sercey & Andrew Atkins & Konstantina Vogiatzaki, 2020. "Understanding Sub and Supercritical Cryogenic Fluid Dynamics in Conditions Relevant to Novel Ultra Low Emission Engines," Energies, MDPI, vol. 13(12), pages 1-25, June.
    3. Dong, Guangyu & Morgan, Robert & Heikal, Morgan, 2015. "A novel split cycle internal combustion engine with integral waste heat recovery," Applied Energy, Elsevier, vol. 157(C), pages 744-753.
    4. Morgan, Robert & Dong, Guangyu & Panesar, Angad & Heikal, Morgan, 2016. "A comparative study between a Rankine cycle and a novel intra-cycle based waste heat recovery concepts applied to an internal combustion engine," Applied Energy, Elsevier, vol. 174(C), pages 108-117.
    5. Dong, Guangyu & Morgan, Robert E. & Heikal, Morgan R., 2016. "Thermodynamic analysis and system design of a novel split cycle engine concept," Energy, Elsevier, vol. 102(C), pages 576-585.
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