具多孔介質裝置之電動馬達熱流場數值研究

Numerical Studies of the Thermal Flowfield in an Electric Motor with Porous Medium Device

徐子圭(Uzu-Kuei Hsu) ； 林世鵬(Shih-Peng Lin) ； 苗志銘(Jr-Ming Miao) ； 戴昌賢(Chang-Hsien Tai)

《航空太空及民航學刊.系列B》 44卷2期 (2012/12) Pp. 109-117

https://doi.org/10.6124/12-0924-706

摘要

本研究希望透過計算流體力學（Computational fluid dynamics, CFD）方式，針對電動馬達的流場及溫度場進行數值模擬，馬達外部透過增設散熱鰭片，降低馬達溫度，並在流體出口區增設多孔介質及導熱板，希望將電動馬達產生的廢熱傳導至導熱板，提供後續使用。CFD分析以不可壓縮流算則求解三維Navier-Stokes 方程，標準k-ε紊流模式結合enhanced壁函數被應用，固體區塊之熱傳以熱傳方程求解。研究分為兩階段進行，第一階段將利用田口實驗設計法（Taguchi method）配合二維克利金代理模型（KRG），對散熱鰭片的構型進行最佳化設計，第二階段將探討多孔介質，對馬達散熱及導熱板導熱的影響。結果得知馬達及導熱板的平均溫度隨孔隙率減少及厚度增加而上升，其中發現當孔隙率增加，多孔介質的厚度幾乎不造成溫度變化。

關鍵字

田口實驗設計法 ； 克利金代理模型 ； 散熱鰭片 ； 多孔介質

並列摘要

This study aims to simulate the thermal-flow filed of an electrical motor using computational fluid dynamics (CFD) method. There are series of conduction fins are mounted on the housing of stators to test the performance for the dissipation of the heat flux from the electrical loops. The model was coupling with porous medium blocks and conduction fins to collect the heat flux from the exhaust, and induced as a renewable energy from the waste heat recovery. The CFD scheme was employed to solve the three-dimensional and steady state incompressible Reynolds-averaged Navier-Stokes equation. The standard k-ε turbulence model was using with enhanced wall treatment. The temperature distributions within solid zones were obtained with solving the heat conduction equation. The research works are divided to two parts. First, an optimization approach on the cooling performance of conduction fins was conducted with the Taguchi method and KRG model. The second, the effect of the motor cooling and fins conduction for a motor with porous medium layer is investigated. The results show that the area-averaged temperature of an electrical motor increased with the porosity of porous medium layer reduced and porous medium thickness increased. However, the change of the temperature was constant with any porous medium layer thickness while the porosity wasincreased.

並列關鍵字

Taguchi method ； KRG model ； Conduction fins ； Porous medium

參考文獻

劉興和，柱型散熱鰭片幾何尺寸影響熱傳性能之研 究，中原大學機械工程系碩士論文，2005 年。(Shing-He Liou, Effect of Dimensions of Cooling Pin-Fins on Heat Transfer Performance, Master Thesis, Depterment of Mechanics, Chung Yuan Christian University, 2005.)

Yakut, K., Alemdaroglu, N., Kotcioglu, I., and Celik, C., “Experimental investigation of thermal resistance of a heat sink with hexagonal fins,” Thermal Engineering, Vol. 26, 2006, pp. 2262-2271.

Hosseini, R., Hosseini-Ghaffar, A., and Soltani, M., “Experimental determination of shell side heat transfer coefficient and pressure drop for an oil cooler shell-and-tube heat exchanger with three different tube bundles,” Thermal Engineering, Vol. 27, 2007, pp. 1001-1008.

Dong, J., Chen, J., Zhang, W., and Hu, J., “Experimental and numerical investigation of thermal-hydraulic performance in wavy fin-and-flat tube heat exchangers,” Thermal Engineering, Vol. 30, 2010, pp. 1377-1386.

Sahin, H. M., Dal, A. R., and Baysal, E., “3-D Numerical study on the correlation between variable inclined fin angles and thermal behavior in plate fin-tube heat exchanger,” Thermal Engineering, Vol. 27, 2007, pp. 1806-1816.