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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >COOLING OF A FINNED CYLINDER BY A JET FLOW OF AIR
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COOLING OF A FINNED CYLINDER BY A JET FLOW OF AIR

机译：空气射流冷却有鳍圆柱体

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The paper describes a patented proposal to use jets of air in the cooling system of heavy trucks. Preliminary tests have been carried out, in the Heat Transfer Laboratory of the University of Rome "Tor Vergata", to evaluate the heat transfer characteristics of a jet flow of air, impinging onto an externally finned cylinder. The cylinder is internally heated with an electric system. Thermocouples, located inside the cylinder, allow to measure the wall temperatures, in order to calculate the local and average convective heat transfer coefficients. A preliminary design of the practical apparatus, applied to heavy trucks, has been done in cooperation with Iveco. Nozzles are designed to be put after the fan of heavy trucks to converge air, in the form of jets, onto the tube where the charged air is flowing from the outlet of the turbo-compressor. The efficiency of the jet flow increases the cooling performances but, due to the high temperature at the outlet of the turbo-compressor, it may not be enough. The heat transfer cooling performances are enhanced if the tube to be cooled is externally finned. Some preliminary experiments have been carried out in a real scale bank test of an heavy truck engine at the Engineering Testing Laboratories Department of Iveco. Comparisons are done between the experiments and a simple theoretical model. Some conclusions are drawn about the cooling at different fluid dynamics conditions of the impinging jets.
机译：该文件描述了一项获得专利的提案，该提案在重型卡车的冷却系统中使用空气射流。在罗马大学“ Tor Vergata”传热实验室进行了初步测试，以评估撞击到外部翅片气缸上的空气射流的传热特性。气缸通过电气系统内部加热。位于圆柱体内的热电偶可以测量壁温，以便计算局部和平均对流传热系数。与依维柯合作，对适用于重型卡车的实用设备进行了初步设计。喷嘴设计为放在重型卡车的风扇之后，以射流的形式将空气汇聚到管道上，增压空气从涡轮压缩机的出口流出。射流的效率提高了冷却性能，但是由于涡轮压缩机出口处的高温，可能还不够。如果要冷却的管子是外部翅片，则传热冷却性能会提高。依维柯工程测试实验室部门在重型卡车发动机的真实规模库测试中进行了一些初步实验。在实验和简单的理论模型之间进行了比较。关于冲击射流在不同流体动力学条件下的冷却，得出了一些结论。

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