The Calculation of the Coefficient of Heat Transfer from the Piston Ring to the Cylinder Bushing

The author proposes a method of determining heat exchange boundary conditions in the ‘piston ring-cylinder bushing’ contact area that have to be set when calculating the thermal state of the cylinder-and-piston group of an internal combustion engine. At present, setting boundary conditions in the ring-bushing zone is problematic. It is difficult to find a direct solution to the full system of equations in this area due to small clearances. The well-known semi-empirical formulae are obtained for a significantly simplified problem where the recommended experimental coefficients are of a very wide range and have a considerable effect on the calculation results. An analytical solution of hydrodynamic equations is proposed to determine the coefficient of heat transfer from the ring to the bushing under the supposition that only hydrodynamic friction is present in the contact area. An equation for calculating the coefficient of heat transfer from the ring to the bushing of the engine cylinder is obtained. The calculation is based on the assumption that the flow in the clearance between the ring and the bushing obeys the Reynolds equation. The problem is solved in the quasi-stationary one-dimensional formulation. An example of the calculation of heat transfer from the ring to the bushing is shown.

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