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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

A PARAMETRICAL STUDY OF FRICTION LOSSES OF A COMBUSTION ENGINE DURING THE WARM-UP PHASE

Get access (open in a dialog) DOI: 10.1615/IHTC10.2640
pages 239-243

Abstract

The objective of this paper is the analysis of a combustion engine behaviour during the warm-up phase where a significant part of the supplied energy is dissipated through friction losses, heat losses and incomplete combustion, especially after a cold start.
A general background of the basic features concerning the engine warm-up is presented, emphasizing on the effect of friction losses which is an important aspect of the fuel economy. Experimental investigations are carried out on an engine bench to evaluate the heat-up of coolant, lubricating oil and engine walls and their interaction with the fuel consumption. To achieve this target a parametrical study is conducted using variable thermohydraulic parameters such as oil viscosity, circulating fluid mass and mass flow rate and initial temperatures. In connection with the experimental work, a transient nodal modelling of the engine has been developed to better understand the complex coupling of the engine physical processes : combustion, friction and cooling.
The numerical results are compared to experimental data in order to validate the model. Discussion and conclusions of the parametric analysis are proposed in terms of the engine coolant and oil temperatures and the fuel consumption during the warm-up phase.