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高速柴油机不同工况下的活塞稳定温度场可以通过松驰法和电解槽模拟来测量和计算,进而确定活塞外表面的局部换热系数。该方法也有不足之处,仅由二十个温度测点不能十分准确地确定其温度场。为了获得可靠的结果,须进行一系列试验。与此同时,活塞的冷却条件须实现很大的变化,先后要计算六十多个温度场,才能确定活塞顶面、底面、冷却腔及活塞环的换热系数。
The steady temperature field of piston under different conditions of high-speed diesel engine can be measured and calculated by relaxation method and cell simulation to determine the local heat transfer coefficient of piston’s outer surface. The method also has some drawbacks. The temperature field can not be determined exactly by only twenty temperature measuring points. In order to obtain reliable results, a series of tests are required. In the meantime, the cooling conditions of the piston must be changed greatly, and more than 60 temperature fields must be calculated successively to determine the heat transfer coefficients of the top surface, bottom surface, cooling chamber and piston ring of the piston.