| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 99 === This study intends to improve the operational performance of commercially available turbine ventilator. The idea of improvements is to design different types of wind deflector and tail fin that are attached peripheral to the impeller. Wind deflector provides guidance for the air current and mends the flow problem, thus increases the rotation speed of impeller, enhance the exhaust ability of ventilator and boost induced flow rate. The tail fin is attached to the rear side of wind deflector, which makes the whole device adaptable to any wind direction and keeps it at proper aweather position.
This study starts with setting up the baseline of the prototype of ventilator, then proposes two improved models, applied respectively to the test of two different prototypes. The experimental parameters are the speed of incoming current, the angle of wind deflector’s opening and the deviation angle of tail fin. The correlations between each parameter and the rotation rate of impeller or induced flow rate are established on measured data, for the purpose of investigating the influence each parameter caused on the enhancement of turbine ventilator’s performance.
According to the results of experimental measurement, under the first improved model, the turbine ventilator reached the highest average rotational speed of impeller when the angle of wind deflector ‘s opening, θo, equals 0° or 22.5° and the highest induced flow rate when θo equals 112.5°. Under the second improved model, the turbine ventilator reached the highest average rotational speed of impeller when the deviation angle of tail fin, θd, equals 5° and 10°, while the tail fin can always promptly respond to the flow of different wind directions and accomplish its directional effect.
The patent of this study is applied. Guided fluid driven turbine(Patent Taiwan: I255880 U.S.: 7086824 China: 200410069797.7 200910157236.5 Patent Pending: Japan).
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