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Investigating the effect of crevice flow on internal combustion engines using a new simple crevice model implemented in a CFD code by C.D. Rakopoulos; G.M. Kosmadakis; A.M. Dimaratos; E.G. Pariotis is a Engineering article available to read on EtoBox.

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A theoretical investigation is conducted to examine the way the crevice regions affect the mean cylinder pressure, the in-cylinder temperature, and the velocity field of internal combustion engines running at motoring conditions. For the calculation of the wall heat flux, a wall heat transfer formulation developed by the authors is used, while for the simulation of the crevices and the blow-by a newly developed simplified simulation model is presented herein. These sub-models are incorporated into an inhouse Computational Fluid Dynamics (CFD) code. The main advantage of the new crevice model is that it can be applied in cases where no detailed information of the ring-pack configuration is available, which is important as this information is rarely known or may have been altered during the engine's life. Thus, an adequate estimation of the blow-by effect on the cylinder pressure can be drawn. To validate the new model, the measured in-cylinder pressure traces of a diesel engine, located at the authors' laboratory, running under motoring conditions at four engine speeds were used as reference, together with measured velocity profiles and turbulence data of a motored spark-ignition en

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Author

C.D. Rakopoulos; G.M. Kosmadakis; A.M. Dimaratos; E.G. Pariotis

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0306-2619)

Published

2011

Language

EN

Field

Engineering (Physical Sciences)