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1 2006

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Application of Radiosity Method to Modelling Cylinder Liner Thermal State of Marine Engines

Tarełko S., Kowalski J., Nowaliński S.

Machine Dynamics Problems

2006

Vol. 30, No. 4

160-170

To increase the piston engine effectiveness, we should recognize the heat-releasing phenomenon from an engine cylinder volume. Such knowledge should allow us to model and determine the thermal stresses in the individual structural components of a cylinder liner. Having, in turn, information concerning the distribution of the thermal stresses in these components, we could design an appropriate layout of cooling system elements such as cooling curves, rates, surfaces, etc. This paper deals with the modelling of heat flow through cylinder liner structural components of a two-stroke engine. Especially, we paid attention to simulating temperature distribution for the wet cylinder liner. Multidimensional equations for the transient heat conduction with the Dirichlet and Fourier boundary conditions have been applied. In particularly, we applied local values for the convective and radiative heat transfer coefficients using the Fourier boundary conditions determined in space of cylinder volume. In order to determine the temperature distribution for the considered space, we applied the radiosity method. Simulation results have been presented in the form of a temperature field for cylinder liner structural components depending on the crankshaft position angle. Application of the iterative calculation method for solving differential equations of energy balance allowed us to use software easy to get. We carried out all iterative computations using Excel spreadsheet. This way, we could decrease the simulation cost significantly.