碩士 / 國立屏東科技大學 / 車輛工程系所 / 99 / This thesis aims to simulate the thermal-flow filed of an electrical motor with computational fluid dynamics method. Various types of conduction fins are attached on the housing of stators to test the performance on dissipation of the heat flux from the electrical loops. Present work designed a new model of coupling porous medium layer and solid conduction plate to collect the exhaust heat flux on the exit of electrical motor to serve as a renewable energy. The commercial software FLUENT@TM is employed to solve the three-dimensional and steady state incompressible Reynolds-averaged Navier-Stokes equation. The turbulence model is the standard k-epsilon turbul ence model with enhanced wall treatment. The temperature distributions within solid zones were obtained with solving the heat conduction equation.
There are two steps in finishing the research works. First, an optimization approach on the cooling performance of conduction fins was conducted with the Taguchi method and KRG model. Yakut [12] proposed that a weighing combination of f and Nu can be regard as the target function in the Taguchi method. Present work observed that the MEPG may be more suitable among others. After S/N analysis, the best design geometry of conduction fins is flat plate type and the thickness and tilt angle is 6.84mm and 12o respectively. This is due to the cooling performance of this conduction fins can be enhanced with 42.26% as compared with electrical motor without the conduction fins.
In the second step, studies were conducted to consider the effects of porous medium layer and conduction plate on the hot spot and heat recovery. Results indicated that the area-averaged temperature of electrical motor increased with a decrease of the porosity of porous medium layer. A reverse trend can be found for the effect of porous medium thickness. An uniform temperature distributions on conduction plate can be found for case of low porosity and the thickness of porous medium layer is below of 10mm. However, for cases of low porosity and porous medium layer thickness are larger than 15mm, hot spots exited on the conduction plate.
| Identifer | oai:union.ndltd.org:TW/099NPUS5162015 |
| Date | January 2011 |
| Creators | Lin Shih-Peng, 林世鵬 |
| Contributors | Tai Chang-Hsien, 戴昌賢 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 80 |
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