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Modelling near wall temperature gradients in "motored" spark ignition engines

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conference contribution
posted on 07.01.2010, 11:22 by R.J. Jenkin, E.H. James, Weeratunge MalalasekeraWeeratunge Malalasekera
A new type of model has been developed to predict near wall temperature gradients and local instantaneous heat fluxes in a "motored" engine. The unburnt charge in an existing "phenomenological" model is divided into a number of discrete masses which are assumed to be "stacked" adjacent to the cylinder surfaces. A sub-model based on the one-dimensional Enthalpy Equation is applied to the system of discrete masses in order to predict the near wall temperature distribution. Predicted temperature profiles are compared with those measured by other researchers and show good agreement under both low and high swirl conditions. Local instantaneous heat fluxes are calculated from the near wall temperature gradients, and these also show good agreement with measured results. Near wall velocity and turbulence data have been used in modeling turbulent eddy transport processes rather than using conventional boundary layer theories. This technique has proven to be very successful in both high and low swirl situations, leading to the conclusion that conventional boundary layer theory may not be applicable to engine type flows.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Citation

JENKIN, R.J., JAMES, E.H. and MALALASEKERA, W., 1996. Modelling near wall temperature gradients in "motored" spark ignition engines. SAE Conference, International Congress and Exposition, Detroit, Michigan, February 1996, paper 960070, pp. 1-13

Publisher

© Society of Automotive Engineers

Version

VoR (Version of Record)

Publication date

1996

Notes

SAE Paper 960070 © 1996 SAE International. This paper is posted on this site with permission from SAE International. As a user of this site, you are permitted to view this paper on-line, and print one copy of this paper at no cost for your use only. This paper may not be copied, distributed or forwarded to others for further use without permission from SAE.This conference paper is also available from http://www.sae.org/technical/papers/960070

ISSN

0148-7191

Language

en

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