Numerical Study on Flow-field Optimization and Noise Reduction of a Range Hood

• Main Authors: Wu, Yu-Shin, 伍昱昕
• Other Authors: Hwang, Po-Wen
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/64urzf

碩士 === 逢甲大學 === 航太與系統工程學系 === 107 === In this study, numerical simulation was used to evaluate the influence of several design parameters on the performance of a range hood and to optimize the parameters by predicting the characteristics of velocity, pressure fields and noise inside the machine. The analysis tool was the computational fluid dynamics software package Fluent and the Ffowes Williams-Hawkings equation was employed to predict its aeroacoustic noise. The simulated pressure-volume curve was first compared with the experimental data for validation, and then the effects on the overall performance were evaluated by varying the thickness of the volute, the shape, position and angle of the volute tongue of the fan inside the range hood. It was found that thickening the volute can reduce the noise, but the airflow will also decrease, so there exists an optimized value. In addition, the use of the airfoil volute tongue instead of the traditional rounded shape can effectively improve the performance of the fan. The position and angle of the volute tongue can be optimized to obtain better results. Simultaneous use of the above parameters can effectively reduce the noise without affecting the airflow, making the internal flow field smoother and achieving the additive effect.