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이호호(Ho Ho Lee),최항철(Hang Cheol Choi),정재구(Jae Goo Jung),이윤표(Yoon Pyo Lee),신유환(Yoo Hwan Shin),정진택(Jin Taek Chung) 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11
The constant air volume flow fan can maintain constant flow rate to the wide range of exit pressure. Therefore, the use of this fan is increasing recently for ventilation of high building. Brushless DC motor is adopted to this fan because that has advantages of compactness and performance. But this type of motor protrude from impeller hub side to fan inlet. The Impeller inlet flow is influenced by size of this obstacle called hub. In this paper, the influence of hub shape on the fan performance characteristics are experimentally and numerically analyzed. CFX 12.0 is used to perform the fan internal flow analysis and numerical results are compared with the experiments. Depending on hub shape, internal loss is generated and the performance and efficiency are reduced. The best performance is occurred around h/b1=0.25. The results of this study will be contribute to initial design of constant air volume flow fan development.