Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Evaluation of Loss Coefficient of a Butterfly Valve with Valve Closed Angles

밸브 닫힘각 변화에 따른 버터플라이밸브의 손실계수 평가

  • 이지근 (전북대학교 기계항공시스템공학부) ;
  • 노병준 (전북대학교 기계항공시스템공학부) ;
  • 최희주 (퍼스텍(주))
  • Published : 2008.01.31
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Abstract

In this study, flow characteristics of a small-sized butterfly valve with the valve disk diameter of 25.4 mm have been investigated experimentally for the valve closed angles. In order to examine the flow characteristics of the butterfly valve, loss coefficient (Kv) was obtained at the valve closed angles of 0$^{\circ}$, 5$^{\circ}$, 10$^{\circ}$, 20$^{\circ}$ and 30$^{\circ}$. In addition, the effects of the valve disk edge shape were examined. As the result of the experiment, the maximum loss coefficient (Kvmax) was decreased with the increase of the valve closed angle, and it had the maximum decrease ratio at the valve disk angles of 0$^{\circ}$~5$^{\circ}$. The valve disk edge shape have an effect on the loss coefficient of the valve around the small valve closed angle.

밸브 디스크 직경이 25.4 mm 인 소형 버터플라이밸브의 유동특성이 다양한 밸브 닫힘각에 대해 실험적으로 연구되었다. 밸브 디스크각이 작은 경우 유량조절특성을 향상시키기 위해 주어지는 밸브 닫힘각을 0$^{\circ}$, 5$^{\circ}$, 10$^{\circ}$, 20$^{\circ}$, 30$^{\circ}$로 변화시켜 밸브 디스크각에 따른 손실계수를 측정하였다. 또한 밸브선단 형상이 손실계수 변화에 미치는 영향을 조사하였다. 밸브 닫힘각이 증가함에 따라 최대손실계수는 감소하며, 밸브 닫힘각 0$^{\circ}$~5$^{\circ}$에서 가장 큰 감소를 나타냄을 알 수 있었다. 밸브 디스크 형상에 따른 손실계수는 밸브 닫힘각이 0$^{\circ}$인 경우 날카로운 모서리를 갖는 디스크가 더 큰 손실계수를 나타낸 반면, 닫힘각 10$^{\circ}$의 경우 날카로운 모서리를 갖는 디스크의 경우가 더 낮은 손실계수를 나타냄을 알 수 있었다.

Keywords

References

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