油冷柴油机的经济性与热负荷研究

Investigation of Fuel Economy and Thermal Loading with an Oil-Cooled Diesel Engine

提出了一种简单易行的油冷却方法,在一台小型高速直喷式油机上,通过对燃烧室壁面稳态温度和瞬态温度的测试得出结论:油冷后稳态壁温升高,瞬态壁温波动减小;油冷后取得的高温冷却效果,使部分负荷时传热损失减小,燃料经济性得到改善。

Oil-cooling was proposed and tested in a small high speed diesel engine of direct injection. Both steady and instantaneous wall temperatures of combustion chamber were measured under various working conditions. It was recorded that the wall temperature was considerably elevated by means of oil as the coolant. The engine fuel consumption was improved, particularly at part load condition, with oil-cooling in comparison with water-cooling on the same engine. So was the cold starting performance. The improvement is attributed to the reduction of heat rejection from the increase in wall temperature