This content is not included in your SAE MOBILUS subscription, or you are not logged in.
A Cooling System Effectiveness Prediction Methodology through the use of Analytical and Numerical Techniques
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2010 by SAE International in United States
Annotation ability available
The use of numerical techniques is widely accepted by manufactures in order to increase engine durability and performances and reduce emissions. The effective thermal load prediction is always considered a nodal point to correctly assess the coolant mass flow rate and jackets arrangement.
In literature many approaches used to analyzed the in-cylinder heat transfer can be found and they can be classified as follows: methods based on the steady convective heat transfer, approaches based on the solution of the unsteady heat conduction equation by means of the knowledge of the temperature profile, approaches based on the energy conservation for the whole mass contained inside the cylinder.
The purpose of this paper is to define a proper methodology to evaluate the thermal flow distribution and intensity inside the engine liner, head and coolant channel. In facts, this work shows the analysis of the cooling circuit of a small single-cylinder, four-stroke, high power density engine carried out with a numerical, three-dimensional CFD analysis using a commercial CFD 3D code.
A numerical conjugate analysis is presented in this work and a particular attention was used to define realistic boundary conditions. Furthermore, a sensitivity study on mesh was also carried out.
This study is based on the knowledge of the mean steady heat flow and takes into consideration the following topics:
the evaluation of the needed coolant mass flow by means of an analysis based on the Woschni approach;
the analysis of the velocity and temperature field by means of a conjugate heat transfer simulation of the whole head and cylinder group.
This work includes the comparison of the numerical results with data collected by literature and experiments.
CitationAntonelli, M., Martorano, L., Simi, A., Di Palma, S. et al., "A Cooling System Effectiveness Prediction Methodology through the use of Analytical and Numerical Techniques," SAE Technical Paper 2010-01-0623, 2010, https://doi.org/10.4271/2010-01-0623.
- Heywood John B. 1988 Internal Combustion Engine Fundamentals McGraw - Hill International Editions.
- Stone Richard 1999 Introduction to Internal Combustion Engine SAE International.
- Ferrari Giancarlo 1992 Motori a Combustione Interna Edizioni Il Capitello.
- Annand J. D. 1963 Heat transfer in the cylinder of reciprocating Internal Combustion Engine Proc. Inst. Mech Eng. Vol. 177, 36.
- Annand J. D. 1986 Heat transfer in the cylinder and porting Oxford University Press, vol.II Oxford.
- Woschni G. 1967 A Universally applicable equation for the instantaneous heat transfer coefficient in the internal combustion engine SAE Trans. 76, SAE Technical Paper 670931, 1967.
- Franco A., Martorano L. 1999 Methods to evaluate In-cylinder heat transfer and thermal load in the small combustion engines, SAE Technical Paper 1999-01-1252, 1999.
- Franco A., Martorano L. 1997 Heat transfer research in the internal combustion engines International Engine Symposium of Zwickau, ‘The Reinassance of motor and vehicle building in Saxony’, Zwickau
- Franco A., Martorano L. 1998 Evaluations on the heat transfer in the small two-stroke engines, SAE Technical Paper 980762, 1998.
- Karamangil M.I., Kaynakli O., Surmen A. 2005 Parametric investigation of cylinder and jacket side convective heat transfer coefficients of gasoline engines Energy Conversion and Management 47, Science Direct.
- Finol C.A., Robinson K. 2006 Thermal modelling of modern engines: a review of empirical correlations to estimate the in-cylinder heat transfer coefficient IMechE.
- Antonelli M., Simi A., Martorano L., Di Palma S., Carapellucci C., A numerical procedure for the evaluation of the engine head-cilinder group cooling effectiveness, ASME Summer Heat Transfer Conference 2009, pp 1-12, San Francisco, 2009.
- Schlichting, Boundary Layer Theory, McGraw Hill Company.