| 研究生: |
黃震宇 Huang, Jen-Yu |
|---|---|
| 論文名稱: |
渦漩對翼片性能影響之研究 Vortex Effect on the Performance of Hydrofoil |
| 指導教授: |
陳政宏
Chen, jeng-Horng |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 造船及船舶機械工程學系 Department of Systems and Naval Mechatronic Engineering |
| 論文出版年: | 2002 |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 59 |
| 中文關鍵詞: | 升阻力量測 、垂直螺槳 、渦漩 |
| 外文關鍵詞: | Hydrofoil, vortex |
| 相關次數: | 點閱:85 下載:3 |
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本研究主要是以實驗的方式了解有關流場中渦漩對於翼片之升阻力和效率的影響;我們利用NACA0012的模型做為量測的翼片。在迴流水槽中做升阻力之量測,了解渦漩對翼片的影響。首先我們先量測迴流水槽所產生的流場是否速度分佈均勻,防止因它變因的發生,降低對實驗所帶來的誤差。之後我們再觀察利用翼片所產生之渦漩的運行軌跡,了解流場經翼片後渦漩所產生的位置為何。再量測翼片受力的大小,進而分析其量測數據,判斷出渦漩所帶來之影響。結果中顯示,升力的確受到渦漩的影響,且當渦漩的強度越強時,其現象越是明顯;阻力方面卻會因為渦漩而使得其阻力變大,換言之,在效率方面而言,渦漩對效率有不好的影響,其影響會因為渦漩的強度而有差異。期望能將發現之結果應用在相關的翼片機構上,如垂直螺槳,使其設計上更有助於效率的提昇,減少振動和噪音的產生。
The blade-vortex interaction was studied experimentally to develop away to improve the efficiency of vertical propeller that is usually designed with uniform inflow assumption. Two NACA0012 hydrofoils were used to conduct the experiment in a circulating water tank. The mean velocities of inflow were from 0.5m/s to 1.6m/s. The first blade with fixed attack angle was used to generate wakes with vorticies. The second blade was set in the wake of the first one with attack angle from 5 degree to 17degree. Its lift and drag force were measured by a three-component force-moment meter in both uniform inflow and wake by reducing attack angle, especially is due to the second blade’s recovery of energy in the first blade’s wake. It is also found that small attack angle cases have higher efficiency. Our present experimental result is accordant to previous numerical simulation result. The result can be used to improve the design of pitch angle of vertical propeller blades when rotating to the downstream half circle.
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