Research on air diversion channel of air-cooled gasoline engine cylinder head and simulation of fluid- solid coupling heat transfer

Abstract

In view of the problem that local temperature of the original cylinder head is on the high side, an innovative cooling air diversion channel is proposed. The cooling air diversion channel introduces cool air into the cylinder head to forcedly cool the cylinder head. Furthermore, the multiple guide plates are set to reasonably distribute cold air in the air diversion channel. In addition, appropriately increase the length of the fins to cooling the whole cylinder head. The fluid-solid coupling three-dimensional simulation technology is adopted to analyze the impact of the new air diversion channel on the heat dissipation of cylinder head. Finally, the optimal scheme is defined to fabricate the prototype. Simulations results show that the above improvements make the temperature in the high temperature region effectively decrease, and the cooling performance of whole cylinder head is enhanced. In the optimal improvement scheme, the highest temperature of cylinder head decrease by 23 K. Furthermore, the prototype was fabricated according to the optimal scheme. The experimental results show that the temperature of the improved cylinder head decreased effectively, and the highest temperature decreased by 20.4 K. The simulation results are in agreement with the experimental results, and the maximum error is less than 5 percent.