Numerical analysis using commercial CFD code was carried out to develop the drag force type vertical axis hydraulic turbine for the improvement of the production efficiency of small hydro energy at low flow velocity condition. Blade pressure changes and internal flows were analyzed according to the presence or absence of the hydraulic turbine blade holes at flow velocity of less than 1.0~3.0 m/s. According to the numerical results, the pressure and flow velocity is severly affected by the flow velocity in turbine blade with no holes, while the influence of flow velocity is comparatively decreased in turbine blade with holes. It is also found that the pressure and flow velocity on the blade surface with holes are evenly distributed with no singular location and it is believed that forming a hole in the blade may be helpful in terms of structural safety.

Abstract
 1. 서 론
 2. 본 론
  2.1 수차 형상 및 수치해석 방법
  2.2 결과 및 고찰
 3. 결 론
 감사의 글
 References

• 박유신(㈜세니츠코퍼레이션 기술연구소, 책임연구원) | Yoo-Sin Park Corresponding author
• 김기중(㈜세니츠코퍼레이션, 대표이사) | Ki-Jung Kim
• 윤병돈(㈜플랜올이엔씨, 상무이사) | Byong-Don Youn