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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >A contribution to film coefficient estimation in piston cooling galleries
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A contribution to film coefficient estimation in piston cooling galleries

机译：对活塞冷却通道中薄膜系数估算的贡献

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摘要

The need to reduce fuel consumption and exhaust emissions in internal combustion engines has been drastically increased during last years. One of the most important processes affecting these parameters is heat transfer from the in-cylinder gas to the surrounding walls, as this mechanism has a direct influence on the combustion process. Regarding the different walls (liner, cylinder head and piston surfaces), heat flow to the piston is especially important, as it is essential to avoid excessively high temperatures that could result in material damage and/or oil cracking. With this purpose different cooling strategies are used, among which the improvement of the piston cooling system by using oil galleries is preferred. In this work, the heat flow through the oil gallery in a Diesel piston was investigated on a dedicated test bench. This bench consists of a controlled heat source and a piston oil cooling system in which different test conditions were evaluated in order to obtain a correlation for the film coefficient associated with piston oil cooling. These experimental results were then incorporated into a lumped model for engine heat transfer. Finally, in order to evaluate the accuracy of this model and the effects of the correlation for oil gallery coefficient on engine heat flows, results obtained on a conventional engine test bench equipped with a Diesel engine, in which two piston temperatures had been measured, were used. The results show an improvement in piston temperature predictions when compared with those obtained using a previously reported expression for the calculation of the oil film coefficient.
机译：近年来，减少内燃机的燃料消耗和废气排放的需求急剧增加。影响这些参数的最重要过程之一是从缸内气体到周围壁的传热，因为这种机制直接影响燃烧过程。对于不同的壁（缸套，汽缸盖和活塞表面），流向活塞的热量尤为重要，因为必须避免过高的温度，这可能导致材料损坏和/或油裂。为此目的，使用了不同的冷却策略，其中优选通过使用油道来改进活塞冷却系统。在这项工作中，在专用测试台上研究了通过柴油活塞中油道的热流。该工作台由受控的热源和活塞油冷却系统组成，在其中评估了不同的测试条件，以获得与活塞油冷却相关的薄膜系数的相关性。然后将这些实验结果合并到用于发动机传热的集总模型中。最后，为了评估该模型的准确性以及油道系数的相关性对发动机热流的影响，在配备了柴油发动机的常规发动机试验台上获得了测量两个活塞温度的结果。用过的。与使用先前报道的用于计算油膜系数的表达式获得的结果相比，结果表明活塞温度的预测有所改善。

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