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Numerical Optimization of Scavenging in Two-Stroke Engines with Transfer Ducts, an Exhaust Port and a Moving Piston

In: Mathematics — Key Technology for the Future

Author

Listed:
  • D. Kröner

    (Institute for Applied Mathematics, University of Freiburg)

  • L. Klassen

    (Institute for Applied Mathematics, University of Freiburg)

  • A. Klimmek

    (Fa. Andreas Stihl AG & Co)

  • D. Trescher

    (Institute for Applied Mathematics, University of Freiburg)

Abstract

For the benefit of the environment, the HC-emission of two-stroke engines has to be reduced. This can be done by reducing the losses of scavenging by improving the geometry of the transfer ducts and the exhaust port. Numerical simulations of the flow through the two-stroke engine should be performed for different geometries in order to reveal the geometry with an optimal scavenge process. The simulations can help to accelerate the development of new two-stroke engines. The underlying mathematical model consists of the compressible Navier-Stokes equations in the cylinder with a moving piston. For the discretization we use a stabilized finite volume scheme on a hexahedral mesh. Up to now we have developed a numerical code for computing the flow in the cylinder and the most important integral quantities such as trapping efficiency and the percentage of exhaust gas at the exhaust port. Now we are able to analyze quantitatively the scavenge process and to estimate the quality of different drafts for the geometrical design.

Suggested Citation

  • D. Kröner & L. Klassen & A. Klimmek & D. Trescher, 2003. "Numerical Optimization of Scavenging in Two-Stroke Engines with Transfer Ducts, an Exhaust Port and a Moving Piston," Springer Books, in: Willi Jäger & Hans-Joachim Krebs (ed.), Mathematics — Key Technology for the Future, pages 22-32, Springer.
    • Handle: RePEc:spr:sprchp:978-3-642-55753-8_2
    DOI: 10.1007/978-3-642-55753-8_2
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