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Effects of Blade-End Open Ratio on Aerodynamic Performance of Multi-Blade Fan

[+] Author Affiliations
Ho Ho Lee

Korea University, Seoul, KoreaKorea Institute of Science and Technology, Seoul, Korea

Hang Cheol Choi, Yoon Pyo Lee, Youhwan Shin

Korea Institute of Science and Technology, Seoul, Korea

Jae Gu Jung

Himpel Co., Ltd., Anyang, Korea

Jin Taek Chung

Korea University, Seoul, Korea

Paper No. FEDSM2012-72231, pp. 497-504; 8 pages
  • ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels
  • Volume 1: Symposia, Parts A and B
  • Rio Grande, Puerto Rico, USA, July 8–12, 2012
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4475-5
  • Copyright © 2012 by ASME


This paper is studied to the performance characteristics and the flow behavior of multi-blade fan according to blade-end open-ratio (k) of near the shroud side. Firstly, the properties related to performance of the fan have been measured in a test rig. In the next, numerical calculations are conducted to explain the complex, three-dimensional flow behavior and performance of the fan using CFX 12.0 commercial code. The validation of numerical results has been performed in comparison with the experimental results. The numerical results provide a comprehensive understanding of the flow behavior inside the fan. By changing the open ratio of blade-end near the shroud side, the flow behavior and inactive zone is respectively different. The separated flows are strongly occurred in a blade passage and the inactive zones are formed near the shroud as k = 0 and 20% cases, relatively. The flow separation and inactive zone reduce fan’s efficiency because they cause internal loss. The best efficiency and flow behavior of the fan is appeared to be at k = 70% case. According to open ratio of blade-end near shroud side, the flow behavior can be changed and the efficiency of a fan can be increasing. The objective of this study is to understand of the complex flow behavior inside the fan and offer guidance for fan designing.

Copyright © 2012 by ASME
Topics: Blades



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