正四角덕트 入口領域에서 코너流動에 관한 硏究 = (A) Study on the coner flow in the entrance region of a square duct

다국어 초록 (Multilingual Abstract)

The corner flow characteristics of a square duct is applied to a miniature, high effectiveness, automatic control of mechanical facilities and architectural facilities on the industrial scenes. It is necessary to analyze exactly the flow characteristics of a square duct using 5-hole pitot tube. Because these can be applied to energy problem of air conditioning system. The governing equations(Continuity & Navier-Stokes equations) are solved theoretically by using a torodial coordinate system in a square duct. The experimental study using air in a square duct carried out to measure the corner flow characteristics by 5-hole pitot tube with 3-D traverse system, blower pressure transducers, A/D converter, amplifiers, power supply and oscilloscope.
According to ratios of x/D_(h) in the a square duct, the following results was suggested.
1. Its is shown exactly symmetrical velocity distributions along a corner bisector
2. As the unsteady flows in the entrance region is developed at the downstream, boundary layer is developed because of viscosity at the wall and potential flow is disappeared when x/D_(h) reach 16.
Thus, we can form clear definition the fully developed region from the point.
3. As flow go by downstream, that uniform velocity line is wrenched shows the increased intensity of secondary flows.
4. The velocity is decreased in caused by friction in the entrance region. The energy loss quantity is large because the velocity gradient become bigger. But, it become the uniform flow in the fully developed region and relatively, loss quantity owing to collision of air particle shows largely.

목차 (Table of Contents)

• 목차 = ⅰ
• List of Figures = ⅲ
• List of Photographs = ⅴ
• ABSTRACT = ⅵ
• Ⅰ. 序論 = 1
• 1.1. 硏究의 背景 = 1
• 1.2. 硏究의 動向 = 3
• 1.3. 硏究의 目的 및 內容 = 4
• Ⅱ. 理論 解析 = 7
• 第3章 實驗 = 16
• 3.1. 實驗 裝置 = 16
• 3.2. 實驗 方法 = 31
• 第4章 結果 및 考察 = 34
• 4.1. 速度分布 = 34
• 4.2. 난류전단응력분포 = 45
• 第5章 結論 = 50
• 參考文獻 = 51
• APPENDIX = 53