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本文运用传热学理论,分析、研究了高原环境对水冷式内燃机冷却系统散热能力的影响。指出高原空气流动雷诺数减小及水沸点降低导致散热能力下降;同时分析出冷却系相对热负荷随海拔升高而增加,二者综合结果致使冷却系沸腾进风温度在高原地区下降,增压发动机尤为显著。在不同海拔时695Q非增压发动机及695QZ增压发动机的冷却系统性能试验基础上,总结出了水冷式内燃机冷却系统性能随海拔高度的变化规律。
In this paper, the theory of heat transfer is used to analyze and study the influence of plateau environment on the cooling capacity of water-cooled internal combustion engine cooling system. It is pointed out that the Reynolds number of the plateau air flow decreases and the boiling point of water decreases, which leads to the decrease of heat dissipation capacity. Meanwhile, the relative heat load of the cooling system increases with the increase of altitude. The combination of the two results in that the boiling temperature of the cooling system drops in the plateau region, The engine is especially noticeable. On the basis of the cooling system performance test of 695Q non-supercharged engine and 695QZ supercharged engine at different altitudes, the law of performance of cooling system of water-cooled internal combustion engine with altitude is summarized.