Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Experimental Study on the Aerodynamic Characteristics of a Counter-Rotating Axial Flow Fan

엇회전식 축류 펜의 공력 특성에 관한 실험적 연구

  • Choe, Jin-Yong (Dept. of Mechanical Engineering, Graduate School of Hanyang University) ;
  • Jo, Lee-Sang (Dept. of Mechanical Engineering, Graduate School of Hanyang University) ;
  • Jo, Jin-Su (Dept. of Mechanical Engineering, Hanyang University) ;
  • Won, Yu-Pil
  • Published : 2002.02.01
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Abstract

Experiments were done for performance and flow characteristics of a counter-rotating axial flow fan. Performance curves of a counter-rotating axial flow fan were obtained and compared by varying the blade pitch angles. The fan characteristic curves were obtained following the Korean Standard Testing Methods for Turbo Fans and Blowers (KS B 6311). The fan flow characteristics were measured using a five-hole probe and a slanted hot-wire. The velocity profiles between the hub and tip of the fans were measured and analyzed at the peak efficiency point. The peak efficiency of the counter-rotating axial flow fan was improved about 15% respectively, compared with the single rotating axial fan. The single rotating axial flow fan showed relatively law efficiency due to the swirl velocities behind rotor exit which produced pressure losses. The counter-rotating axial flow fan showed that the swirl velocity generated by the front rotor was eliminated by the rear rotor and the associated dynamic pressure is recovered in the from of the static pressure rise.

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References

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