Title: A 1-D gas dynamics code for subsonic and supersonic flows applied to predict EGR levels in a heavy-duty diesel engine

Authors: Yuhua Zhu, R.D. Reitz

Addresses: Engine Research Center, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706, USA. Engine Research Center, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706, USA

Abstract: The development of a 1-D gas dynamics code for unsteady flow in internal combustion (IC) engines as well as its validation and application for predicting residual gas fraction are introduced in this paper. Some new approaches are presented for modelling flows in diverging ducts and for treating boundary conditions. These include the use of flow resistance correlation to describe separated flows and flows in bends. Excellent agreement with analytical solutions and test results has been obtained when the code was validated with fundamental gas dynamic problems, including converging-diverging nozzle flows with and without shocks; Fanno and Rayleigh flows; the Riemann shock tube problem; and engine rig experiments for modelling flow with different property gases. The code has been applied satisfactorily to predict the gas exchange process of a spark ignition (SI) engine following exhaust blow-down and exhaust gas recirculation (EGR) levels in a heavy-duty diesel engine.

Keywords: 1-D flow modelling; gas dynamics; residual gas fraction; boundary condition; IC engine.

DOI: 10.1504/IJVD.1999.001867

International Journal of Vehicle Design, 1999 Vol.22 No.3/4, pp.227-252

Published online: 18 Aug 2003 *

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