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1.前言近年来,在汽车的高性能化中,要求发动机既能节省资源、降低油耗,又要有高的功率。为满足高功率化的要求,涡轮增压、4气门、顶置双凸轮轴及增加排气量等技术获得了迅速发展。由于高功率发动机放热量的增加,对其冷却系统的设计也提出了更高的要求。此外,在最近的高性能车上,由于各种辅助装置的增加,使发动机室内的剩余空间减少,以及
1. Introduction In recent years, in the high performance of automobiles, the engine is required to save resources, reduce fuel consumption, and have high power. In order to meet the demands of high power generation, technologies such as turbocharging, 4-valve, overhead camshafts and increased displacement have been rapidly developed. Due to the increase of heat release of high-power engine, the design of its cooling system is also put forward higher requirements. In addition, in the recent high-performance vehicles, due to the increase of various auxiliary devices, the remaining space in the engine room is reduced, and