| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 103 === For meeting people’s requirements on life quality, the high-performance stand fan has become an essential appliance in every family. On the other hand, energy saving can not only solve the problem of environment protection, but also can reduce the cost of energy consumption. However, the aerodynamic performance and flow characteristic of stand fan are rarely investigated and analyzed in a systematical manner. Therefore, this research intends to investigate the physical mechanism of the flow pattern and identify the design parameters of stand fan by combining the numerical and experimental tools.
First of all, a commercial 14-inch stand fan is chosen to analyze its construction and performance for serving as the reference fan. The stand fan can be divided into the rotor and the protective cover. Clearly, the impeller blade has a great influence on the fan performance so that the fan impeller is the first design target. In this work, CFD software Fluent is used to evaluate and observe the corresponding influences on flow pattern and aerodynamic performance caused by the design parameters such as the setting, twist, and inclining angles. Then, the protective fan cover is studied and improved to integrate with the designed rotor for a superior fan performance. The protective cover is modified by imposing the appropriate distance, shape and the rib angle in order to improve the fan’s flow field and performance. Finally, the optimal fan mockup is made via CNC technology for measuring the acoustic and aerodynamic performances, which are used to validate the accuracy and reliability of the numerical simulation.
After comparing experimental results with the numerical simulation, it is shown the experimental results are in agreement with the numerical simulation within the deviation range of 10~14%. Moreover, the test results show that the designed stand fan is better than the reference fan with a significant 54% increase on flow rate and a more uniform velocity distribution for the comfortable feeling for human body. In summary, this research successfully establishes a reliable and systematic scheme to design the stand fan. Also, the corresponding performance influences caused by those important parameters are analyzed and summed up for serving as the design reference for the stand fan.
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