碩士 / 國立成功大學 / 造船及船舶機械工程學系 / 90 / 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.
| Identifer | oai:union.ndltd.org:TW/090NCKU5345005 |
| Date | January 2002 |
| Creators | Jen-Yu Huang, 黃震宇 |
| Contributors | jeng-Horng Chen, 陳政宏 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 59 |
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