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RESEARCH PAPERS

Numerical Simulation of the Fluid Flow and Heat Transfer Processes During Scavenging in a Two-Stroke Engine Under Steady-State Conditions

[+] Author and Article Information
M. de Castro Gouveia, J. A. dos Reis Parise, A. O. Nieckele

Department of Mechanical Engineering, Pontificia Universidade Católica do Rio de Janeiro, 22453, Rio de Janeiro, RJ, Brazil

J. Heat Transfer 114(2), 383-393 (May 01, 1992) (11 pages) doi:10.1115/1.2911286 History: Received January 31, 1990; Revised July 22, 1991; Online May 23, 2008

Abstract

A numerical simulation of the scavenging process in a two-stroke flat-piston model engine has been developed. Air enters the cylinder circumferentially, inducing a three-dimensional turbulent swirling flow. The problem was modeled as a steady-state axisymmetric flow through a cylinder with uniform wall temperature. The steady-state regime was simulated by assuming the piston head fixed at the bottom dead center. The calculation was performed employing the k–ε model of turbulence. A comparison of the results obtained for the flow field with available experimental data showed very good agreement, and a comparison with an available numerical solution revealed superior results. The effects of the Reynolds number, inlet port angles, and engine geometry on the flow and in-cylinder heat transfer characteristics were investigated. The Nusselt number substantially increases with larger Reynolds numbers and a smaller bore-to-stroke ratio. It is shown that the positioning of the exhaust valve(s) is the main parameter to control the scavenging process.

Copyright © 1992 by The American Society of Mechanical Engineers
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