Journal of Hydrodynamics

, Volume 20, Issue 3, pp 299–305 | Cite as

Internal flow Mechanism and Experimental Research of low Pressure Axial fan with Forward-Skewed Blades

  • Yang LiEmail author
  • Jie Liu
  • Hua Ouyang
  • Zhao-Hui Du


This article presents the flow mechanism analysis and experimental study of a forward-skewed impeller and a radial impeller in low pressure axial fan. The forward-skewed blade was obtained by the optimization design of the radial blade and CFD technique. Measurement of the two blades was carried out in aerodynamic and aeroacoustic performance. Compared to the radial blade, the forward-skewed blade has demonstrated the improvements in efficiency, total pressure ratio, Stable Operating Range (SOR) and less aerodynamic noise. Detailed flow measurement and computation were performed for outlet flow field for investigating the responsible flow mechanisms. The results show the forward-skewed blade can cause a spanwise redistribution of flow toward the blade mid-span and reduce tip loading. This results in reduced significantly total pressure loss near hub and shroud endwall region, despite the slight increase of total pressure loss at mid-span.

Key words

low pressure axial fan forward-skewed blade aerodynamic performance flow mechanism 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    WADIA A. R., SZUCS P. N. and CRALL D. W. Inner workings of aerodynamic sweep [J]. Journal of Turbomachinery, Transactions of ASME, 1998, 120(4): 671–682.CrossRefGoogle Scholar
  2. [2]
    ZHANG Li-xiang, WANG Wen-quan. Intrinsic features of turbulent flow in strongly 3-D skew blade passage of a Francis turbine [J]. Journal of Hydrodynamics, Ser. B, 2007, 19(1): 92–99.CrossRefGoogle Scholar
  3. [3]
    LIU Ying-zheng, CAO Zhao-min. Recent progress on particle image velocimetry in China [J]. Journal of Hydrodynamics, Ser. B, 2006, 18(1): 11–19.Google Scholar
  4. [4]
    LI Yang, OUYAN Hua and DU Zhao-hui. Experimental research on aerodynamic performance and exit flow field of low pressure atial flow fan with circumferential skewed blades[J]. Journal of Hydrodynamics, Ser. B, 2007, 19(5): 579–586.CrossRefGoogle Scholar
  5. [5]
    CAI Na, XU Jian-zhong and BENAISSA A. Aerodynamic and aeroacoustic performance of a skewed rotor [C]. ASME, International Gas Turbine Institute, Turbo Expo (Publication) IGTI. Atlanta, USA, 2003, 6 (A): 497–504.Google Scholar
  6. [6]
    BEILER M. G., CAROLUS T. H. Computation and measurement of the flow in axial flow fans with skewed blades [J]. Journal of Turbomachinery, Transactions of ASME, 1999, 121(1): 59–66.CrossRefGoogle Scholar
  7. [7]
    OUTA E. Rotating stall and stall-controlled performance of a single stage subsonic axial compressor [J]. Journal of Thermal Science, 2006,15(1): 1–13.CrossRefGoogle Scholar
  8. [8]
    CORSINI A., RISPOLI F. The role of forward sweep in subsonic axial fan rotor aerodynamics at design and off-design operating conditions [C]. ASME, International Gas Turbine Institute, Turbo Expo (Publication) IGTI. Atlanta, USA, 2003, 6(A): 543–553.Google Scholar
  9. [9]
    CORSINI A., RISPOLI F. Using sweep to extend the stall-free operational range in axial fan rotors [J]. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2004, 218(3): 129–140.Google Scholar
  10. [10]
    CAROLUS T. H., BEILER M. G. Skewed blades in low pressure fans: a survey of noise reduction mechanisms [C]. 3rd AIAA/CEAS Aeroacoustics Conference. Atlanta, USA, 1997, 47–56.Google Scholar
  11. [11]
    LOTFI O., TEIXEIRA J. A. and IVEY P. C. et al. Shape optimization of axial fan blades using genetic algorithms and a 3D Navier-Stokes solver [C]. Proceedings of the ASME Turbo Expo. 2006, 6(Part B): 1373–1383.Google Scholar
  12. [12]
    WANG Zhong-qi, ZHENG Yan. Research status and development of the bowed-twisted blade for turbomachines [J]. Engineering Science, 2000, 2(6): 40–48 (in Chinese).Google Scholar
  13. [13]
    CAI Na, LI D. and ZHONG Fang-yuan. Optimum design and experiment on skewed-swept rotating blades [J]. Journal of Shanghai Jiaotong University, 1997, 31(2): 81–85 (in Chinese).MathSciNetGoogle Scholar
  14. [14]
    OUYANG Hua, LI Yang and DU Zhao-hui et al. Experimental study on aerodynamic and aero-acoustic performance of low pressure axial flow fan with circumferential skewed blades [J]. Journal of Aerospace Power, 2006, 21(4): 668–674 (in Chinese).Google Scholar
  15. [15]
    Numeca International Inc. Fine™ numeca’s flow integrated environment [M]. User Manual, Version 6.2, Brussel, Belgium, 2004.Google Scholar
  16. [16]
    SPALART P. R., ALLMARAS S. R. One-equation turbulence model for aerodynamic flows [J]. La Recherche Aerospatiale, 1994, (1): 5–21.Google Scholar
  17. [17]
    STANDARDIZATION ADMINISTRATION OF CHINA. Test methods of aerodynamic performance for fans [M]. Beijing: Standards Press of China, 2000 (in Chinese).Google Scholar
  18. [18]
    STANDARDS PRESS OF CHINA. Methods of noise measurement for fans, blower compressors and roots blowers [M]. Beijing: Standards Press of China, 1991 (in Chinese).Google Scholar

Copyright information

© China Ship Scientific Research Center 2008

Authors and Affiliations

  1. 1.College of Electromechanical EngineeringQingdao University of Science and TechnologyQingdaoChina
  2. 2.School of Environmental and Municipal EngineeringQingdao Technological UniversityQingdaoChina
  3. 3.School of Mechanical EngineeringShanghai Jiaotong UniversityShanghaiChina

Personalised recommendations