嘉兴学院毕业论文设计外文翻译吴依呈.docVIP

嘉兴学院毕业论文（设计）外文翻译 题目（外文）：Experiments and modeling of heat transfer in oil transformer winding with zigzag cooling ducts　　　　　　　　　　　　　　　　　　　　　 题目（中文）：　带Z型冷却通道的油浸式变压器绕组传热实验和模拟　　　　　　　　　　　　　　　　　　　　　 学院名称：机电工程学院专业班级：机械061学生姓名：吴依呈　　　　　　 注：对图片中文字的翻译附在下面；公式使用latex公式编辑器编辑。 一、外文摘要及关键词 Abstract In natural oil-cooled (ON) electric transformers, cooling fluid flow and heat transfer process depend on each other. A coupled thermal/hydraulic model has been developed to investigate 2-D axi-symmetric temperature field in solid heating components (transformer windings) and hydraulic and thermal fields in network of oil cooling ducts. The convective heat transfer at solid/fluid interface was taken as coupling element between the heat generating windings and the cooling oil flow. An experimental study has also been conducted to investigate oil and disk temperatures in ON transformer windings. The results have been used to validate and then calibrate the developed simulation model, with an implicit nonlinear optimization approach. Consequently two empirical correlations for local convection heat transfer coefficient have been developed, corresponding to cooling ducts with heating on one-side and both-side walls, respectively. The correlations are valid for Reynolds numbers ranging from 7.5 to 75.9 in both-side heating ducts and from 1.5 to 218.4 in one-side heating ducts. The improved thermal model is in good agreement with the experimental results. It is also found from the experimental study that the conductor temperature gradients in circumferential direction is small and can be neglected, and therefore a two-dimensional axi-symmetric model is sufficiently accurate for the thermal simulation of the winding disks.  2007 Elsevier Ltd. All rights reserved. Keywords: Electric transformer; Heat transfer; Hydraulic; Coupling; Modeling; Experiment 二、中文摘要及关键词 摘要 在自然冷却的油冷（ON） 2007 Elsevier Ltd. All rights reserved. 关键词：电力变压器；热传递；流体动力学；联接；模拟；实验 三、外文正文 1. Introduction Electric transformer is a k