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| 研究生： |
吳凱文 Kai-Wen Wu |
|---|---|
| 論文名稱： |
利用可視化流場實驗修正複合式軸流風扇之翼型 Using Visualization Experiment to Modify Combinative Axial Fan Airfoil |
| 指導教授： |
林唯耕
Wei-Keg Lin |
| 口試委員: | |
| 學位類別： |
碩士 Master |
| 系所名稱： |
原子科學院 - 工程與系統科學系 Department of Engineering and System Science |
| 論文出版年： | 2002 |
| 畢業學年度： | 90 |
| 語文別： | 中文 |
| 論文頁數： | 125 |
| 中文關鍵詞： | 風扇噪音 、可視流 、導流葉片 、二次流 、渦漩 |
| 外文關鍵詞： | Fan Noise, Flow Visualization, Guide Vane, Second Flow, Vortex |
| 相關次數： | 點閱：2 下載：0 |
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摘 要
本研究針對軸流風扇翼型之特性作一延伸改良，也就是在風扇出口處加裝一組複合式導流葉片，目的在於降低渦流的發生，使空氣之流動型式由紊亂地螺旋狀改善為較均勻平滑流動，改善因二次流場所造成之影響，提昇風扇性能及降低流場擾動產生之流場噪音。
首先設計四組相同葉片數，不同水平傾斜角之比對風扇，經由CNC加工風扇翼型，並製造出風扇實體。本實驗利用符合AMCA Standard 210-85規範之風洞設備量測其風扇效率性能曲線，再以符合Test Standards ISO-3745 and ANSI 12.35無響室執行噪音測試，最後將風扇置於水洞觀察流場狀態。再針對這四組比對風扇設計出十二組不同葉片數，不同水平傾斜角之導葉片，並重覆前述三種實驗，比較加裝導流葉片前後的差異。最後利用水洞實驗驗証風扇加裝導葉片確實可減低二次流場的發生，由於停滯區尺度大幅減小、渦流情況大幅降低，風扇加裝導流葉片後最大靜壓大約可提升百分之十左右，因渦流擾動產生的風壓噪音也可降低高達1~4dB。
經過一連串實驗，得到大量實驗資料加以統計分析結果可得知，導流葉片之葉片數量多寡關係到最大靜壓的提升量，而風扇與導流葉片之水平傾斜角搭配組合關係到靜壓提升之區域。
Abstract
The research to be aimed an axial-flow of electric fan and improve the character of extend. In the other ways, it is add the composite model the guide vane out the fan. The purpose is reduce the vortex happened. It made the air-floating model improve to the balance and fluid smooth. The improve because the second flow influence. Upgrade the fan function and reduce the flow visualization caused the fan noise.
At first we need design and set four same leaves of the fan, the different level and horizontal inclination angle to contrast to the fan, after CNC to manufacture the fan of the aerofoil. It also creative the prototype of the fan. This experiment utilizes in AMCA Standard and match the equipment of wind tunnel to measure the efficiency function curve of the 210-85 standard. And follow the ANSI 12.35 under the Free Field Full Anechoic Chamber to perform the noise test. Finally, we put the fan in the water tunnel and observed the situation of the flow. We should focus those four groups contrast the fan to design 12 different to the leaves of the fan. The guide vane based on the different water level of horizontal inclination angle. To repeat the three tests and compare what the different before put the guide vane. Finally, use the water tunnel to verify and approve the fan added the guide fan it will reduce the second flow happened. Owing to stagnate area scale and wide margin to decrease. The vortex wide be reduced. After added the guide vane the maximum static pressure maybe promote about 10%. Because the vortex disturb caused the wind pressure can reduce 1 to 4dB also.
After a series of experimentation, we obtain a large number of data and static with analysis get the result that fan leaves of the guide vane is relative to promote the maximum static pressure. The water level and inclination of angle will get the relationship and match the fan to promote static pressure area.
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