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RESEARCH PAPERS: Internal Combustion Engines

Influence of the Exhaust System on Performance of a 4-Cylinder Supercharged Engine

[+] Author and Article Information
F. Trenc, F. Bizjan

Department of Mechanical Engineering, University of Ljubljana, Ljubljana, Slovenia

A. Hribernik

Department of Mechanical Engineering, University of Maribor, Maribor, Slovenia

J. Eng. Gas Turbines Power 120(4), 855-860 (Oct 01, 1998) (6 pages) doi:10.1115/1.2818478 History: Received October 07, 1997; Online November 19, 2007

Abstract

Twin entry radial turbines are mostly used to drive compressors of small and medium size 6-cylinder diesel engines where the available energy of the undisturbed exhaust pulses can be efficiently used to drive the turbine of a turbocharger. Three selected cylinders feed two separated manifold branches and two turbine inlets and prevent negative interaction of pressure waves and its influence on the scavenging process of the individual cylinders. In the case of a four-stroke, 4-cylinder engine, two selected cylinders, directed by the firing order, can be connected to one (of the two) separated manifold branches that feeds one turbine entry. Good utilization of the pressure pulse energy, together with typically longer periods of reduced exhaust flow can lead to good overall efficiency of the “two-pulse” system. Sometimes this system can be superior to the single manifold system with four cylinders connected to one singleentry turbine. The paper describes advantages and disadvantages of the above described exhaust systems applied to a turbocharged and aftercooled 4-cylinder Diesel engine. Comparisons supported by the analyses of the numerical and experimental results are also given in the presented paper.

Copyright © 1998 by The American Society of Mechanical Engineers
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