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Transport Phenomena in Thermal Engineering. Volume 2

ISBN:
1-56700-015-0 (Print)

AN EXAMINATION OF TRANSIENT FUEL/AIR FLOWS IN MANIFOLDS

Brian E. Milton
Emeritus Professor, School of Mechanical and Manufacturing Engineering The University of New South Wales Sydney, NSW 2052 Australia

Masud Behnia
School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney 2052, Australia

D. R. Vidler
School of Mechanical and Manufacturing Engineering, University of New South Wales, P.O. Box 1, Kensington N.S. W., 2033, AUSTRALIA

Abstract

Flows in the induction systems of internal combustion engines are extremely complex being two phase, separated stream, multi-component, pulsating flows with interchange between the streams due to deposition, re-entrainment, evaporation and condensation. In addition, under normal operation, acceleration and deceleration transients are superimposed. This study examines a quasi-steady approach to the calculation of transient air/fuel ratio effects which is based on output from a steady state analysis of the manifold flow. By comparing the results with experiments, additional aspects of the flow can be inferred. In particular, some secondary atomization to a mean droplet size of 20 μm at the throttle plate is needed.