Numerical Study of a Fan Filter Unit

• Main Authors: Min-han Hsieh, 謝旻翰
• Other Authors: Sheam-Chyun Lin
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/34312356512333097683

碩士 === 國立臺灣科技大學 === 機械工程系 === 96 === This numerical research aims to investigate the flow field associated with FFU (fan filter unit) system for enhancing the uniform distribution at discharge and its efficiency, which are essential for fulfilling the requirements on uniform flow distribution and operation cost reduction for the clean room. At first the FFU is tested at an AMCA wind tunnel to attain the aerodynamic performance, which is used to compare and validate the corresponding numerical simulation. Next, the CFD result is utilized to visualize and identify the shortcoming of flow field inside the FFU. Based on these deficiencies, the improving alternatives considered here can be classified into the flow-path-related modifications and the rotor-related parameters, such as the shapes of shroud and inlet bell, the reducing height of rotor, and the additions of central body and airfoil blade. With the implement of these rotor-related modifications, the maximum flow rate, static pressure, and maximum efficiency are increased by 10%, 2.5%, and 10%, respectively. Thereafter, further improvements along the flow passage, such as the open area reduction on the original guiding plate and the addition of porous guiding plate close to FFU side plates, are adopted to reduce the reversed flow at open area on the guiding plate and to enhance the uniform velocity distribution at FFU discharge. An enhancement on uniform distribution is well demonstrated by increasing the effective area ratio at FFU outlet from 36.2% to 61.5%. In summary, this research successfully establishes a systematic and effective design scheme for the fan filter unit (FFU) via an integrated experimental and CFD effort.