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A Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation

Author

Listed:
  • Maria Faruoli

    (Scuola di Ingegneria, Università degli Studi della Basilicata, Viale dell’Ateneo Lucano, 85100 Potenza, Italy)

  • Alessandro Coclite

    (Dipartimento di Ingegneria Elettrica e dell’Informazione, Politecnico di Bari, Via Re David, 70125 Bari, Italy)

  • Annarita Viggiano

    (Scuola di Ingegneria, Università degli Studi della Basilicata, Viale dell’Ateneo Lucano, 85100 Potenza, Italy)

  • Paolo Caso

    (Costruzioni Motori Diesel CMD S.p.A., San Nicola La Strada, 81020 Caserta, Italy)

  • Vinicio Magi

    (Scuola di Ingegneria, Università degli Studi della Basilicata, Viale dell’Ateneo Lucano, 85100 Potenza, Italy
    Department of Mechanical Engineering, San Diego State University, San Diego, CA 92182, USA)

Abstract

The scavenging process of two-stroke engines plays a fundamental role in cylinder flow patterns and in the overall engine performance. In this work, 3D CFD simulations of the scavenging in a uniflow, two-stroke, compression ignition engine for general aviation, named GF56, have been performed by using a 3D finite-volume FANS equations solver with k - ϵ closure. The GF56 engine consists of six cylinders, separated into two quasi-symmetric banks. Both the right and the left banks, together with the corresponding cylinders, are carefully analyzed. Charging and trapping efficiencies are computed as a function of the delivery ratio for different mass flow rates entering into the plenum, and the influence of the exhaust pressure and of the cylinder’s location in the bank are analyzed. The results show that the fresh air trapped during the scavenging process is quite similar for each cylinder of the right bank and it is about 92% of the in-cylinder mass. The cylinder’s location in the bank by itself slightly affects the scavenging performance, whereas the pressure profile at the outlet section has a major role. The design of the intake ports is fundamental for establishing the in-cylinder flow field and a new ports configuration is proposed to enhance the swirl ratio and, consequently, the scavenging performance with high delivery ratios.

Suggested Citation

  • Maria Faruoli & Alessandro Coclite & Annarita Viggiano & Paolo Caso & Vinicio Magi, 2021. "A Comprehensive Numerical Analysis of the Scavenging Process in a Uniflow Two-Stroke Diesel Engine for General Aviation," Energies, MDPI, vol. 14(21), pages 1-19, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7361-:d:672632
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    References listed on IDEAS

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    1. Sigurdsson, E. & Ingvorsen, K.M. & Jensen, M.V. & Mayer, S. & Matlok, S. & Walther, J.H., 2014. "Numerical analysis of the scavenge flow and convective heat transfer in large two-stroke marine diesel engines," Applied Energy, Elsevier, vol. 123(C), pages 37-46.
    2. Raptotasios, Spiridon I. & Sakellaridis, Nikolaos F. & Papagiannakis, Roussos G. & Hountalas, Dimitrios T., 2015. "Application of a multi-zone combustion model to investigate the NOx reduction potential of two-stroke marine diesel engines using EGR," Applied Energy, Elsevier, vol. 157(C), pages 814-823.
    3. Wu, Yining & Wang, Yang & Zhen, Xudong & Guan, Shuai & Wang, Jiancai, 2014. "Three-dimensional CFD (computational fluid dynamics) analysis of scavenging process in a two-stroke free-piston engine," Energy, Elsevier, vol. 68(C), pages 167-173.
    4. Fukang Ma & Zhenfeng Zhao & Yangang Zhang & Jun Wang & Yaonan Feng & Tiexiong Su & Yi Zhang & Yuhang Liu, 2017. "Simulation Modeling Method and Experimental Investigation on the Uniflow Scavenging System of an Opposed-Piston Folded-Cranktrain Diesel Engine," Energies, MDPI, vol. 10(5), pages 1-18, May.
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