Improvement of the air-cooled system on an engine cylinder head and its analysis

Abstract

In view of the problem that local temperature of the original cylinder head is on the high side, an innovative cooling air duct is proposed. The cooling air duct introduces cool air into the cylinder head to forcedly cool the cylinder head, and multiple guide plates are set to distribute the cold air in the duct. The three-dimensional numerical simulation technology is adopted to analyze the impact of the air duct on the heat dissipation of cylinder head. Finally, the enhanced heat transfer characteristics of improvement schemes were evaluated. Results show that the high temperature of the improvement schemes effectively decreased and the cooling performance of the whole cylinder head and the final improvement scheme are enhanced. The highest temperature of the cylinder head in the final improvement scheme decreased by 28 K, and the average temperature of the intake duct in the final improvement scheme dropped by 12.8 K compared with that in the original cylinder head, which is conducive to increasing the intake density and the discharge coefficient.