Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Investigation of Local Flow Parameters Caused by Flow Acceleration Corrosion Downstream of an Orifice in a Piping System

배관계 오리피스 하류에서 유동가속부식으로 인한 국소 유동 파라미터에 대한 조사

  • Kim, Kyung-Hoon (Department of Mechanical Engineering, Kyunghee University) ;
  • Cho, Yun-Su (Graduate School of Mechanical Engineering, Kyunghee University) ;
  • Kim, Hyung-Joon (School of Mechanical and Aerospace Engineering, Seoul National University)
  • 김경훈 (경희대학교 공과대학 기계공학과) ;
  • 조연수 (경희대학교 대학원 기계공학과) ;
  • 김형준 (서울대학교 기계항공공학부)
  • Received : 2013.01.23
  • Published : 2013.07.10
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Abstract

In this study, the performance of an impeller according to blade length and pitch angle was studied experimentally by building a variable pitch impeller while changing blade length to review the effect of blade length and pitch angle on a fan's performance. The pitch angle was changed in six steps from $20^{\circ}{\sim}45^{\circ}$ at intervals of $5^{\circ}$ while the blade lengths were changed to 90 mm, 100 mm, 110 mm and 120 mm with an identical airfoil shape while carrying out the experiment. The results are summarized as follows : The air flow per static pressure of axial fans increased linearly with increase of pitch angle, but the high static pressure showed a decrease at a pitch angle of $35^{\circ}$. The shaft power increased proportionally to the pitch angle at all blade lengths; the larger the pitch angle, the larger the measured increase of shaft power. This is because the drag at the fan's front increases with the pitch angle. In the axial fans considered in this research, the flow and incre.

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