Browse Publications Technical Papers 2018-32-0036
2018-10-30

Analysis of Cooling and Warm-up Performance of Oil-cooled Engine with Fin-shaped Oil Jacket 2018-32-0036

The oil-cooled engine has been developed in order to achieve a better warm-up performance. The oil-cooled engine has the oil jacket which pass around the exhaust port and the cylinder bore. The fins are installed inside the oil jacket to enhance the cooling performance. The result of a bench test shows that the fins enhance the cooling performance with slight loss of the warm-up performance. The aim of this study is to clarify effects of the fins. This study conducts two simulations to clarify effects of the fins. One is a cooling simulation, which is conducted to clarify the reason why the fins enhance the cooling performance. The other is a warm-up simulation, which is conducted to clarify the reason why the fins maintain the warm-up performance. The cooling simulation is conducted with a steady flow simulation. It simulates a full-load operation of the bench test, and it compares the converged temperature between the engines with/without the fins. The warm-up simulation is conducted with an unsteady flow simulation. It simulates a warm-up operation of the bench test, and it compares the transitional temperature. The cooling simulation shows that the fins enhance the heat transfer coefficient of the oil jacket, and the fins mix the oil in the oil jacket. Therefore, the oil jacket with the fins transfers larger amount of heat from the engine to the oil; the fins enhances the cooling performance. The warm-up simulation indicates that the location of the fins and the path of the oil jacket affect the warm-up performance.

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