Proposal of Wall Heat Transfer Coefficient Applicable to Spray-wall Interaction Process in Diesel Engines

- Identification of Wall Heat Transfer Coefficient Based on ‘Similarity Theory of Spray Characteristics’ -

Abstract

An estimation of heat-loss through the wall from in-cylinder gas is a key to achieve higher thermal efficiency of diesel engines. In the first report of a series of studies, a formula of heat transfer coefficient, which plays a key role in heat-loss processes, was explored by applying ‘‘Similarity of Spray Characteristics’. It was clarified that the dependency of representative velocity on heat transfer coefficient is a half level of that of the conventionally used Woschni formula.