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Transport Phenomena in Thermal Engineering. Volume 2

ISBN Print: 1-56700-015-0

AN EXAMINATION OF TRANSIENT FUEL/AIR FLOWS IN MANIFOLDS

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.
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