Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Experimental Study of Micro hydropower with Vortex Generation at Lower Head Water

저낙차에서 와류발생부를 구비한 마이크로 소수력에 관한 실험 연구

  • Choi, In-Ho (Department of Civil Engineering, Seoil University) ;
  • Kim, Jong-Woo (Department of Civil Engineering, Seoil University) ;
  • Chung, Gi-Soo (Korea Institute of Industrial Technology(KITECH)/Hanjung Energy Networks Co., Ltd.)
  • 최인호 (서일대학교 토목공학과) ;
  • 김종우 (서일대학교 토목공학과) ;
  • 정기수 (한국생산기술연구원/(주)한중에너지네트웍스)
  • Received : 2020.05.08
  • Accepted : 2020.05.20
  • Published : 2020.05.31
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Abstract

This paper described a laboratory investigation of micro hydropower at lower head water in a free vortex flow. The vortex height, turbine rotation and torque for straight blade with inner curved edge, twisted blade and curved blade were investigated at the flow rate of 0.0069 ㎥/s in the inlet channel. The results showed that the optimum vortex strength occurred within the range of the diameter of basin to the outlet diameter ratios of 0.17~18.5. The power output and efficiency of straight blade were higher as compared to other blades. The highest amount of generated energy was 12.33 W, the torque was 0.91 N·m and the highest efficiency by considering effective head was 29.5 %, whereas the highest efficiency by considering vortex height was 80.5 % at the rotational speed of 132 rpm. The water vortex velocity of straight blade was about 2.8 times larger than the mean velocity in the inlet channel.

본 논문은 자유수면을 가지는 와류유동 내 저낙차에서 마이크로 소수력에 관한 실험 연구이다. 내부 곡선 모서리가 있는 직선, 곡선, 비틀린 블레이드의 와류 높이, 터빈 회전 및 토크를 개수로 유입구의 유량 0.0069 ㎥/s 조건에서 측정하였다. 실험결과로서 최적의 와류 강도는 와류 발생부의 외부직경과 유출구 직경 비율 0.17~18.5 범위에서 발생했다. 직선 블레이드 출력과 효율은 다른 블레이드와 비교하여 높게 나타났다. 가장 높게 생성된 에너지는 12.33 W이고, 토크는 0.91 N·m이다. 유효낙차를 고려한 경우 가장 높은 효율은 29.5 %인 반면 와류 높이를 고려한 가장 높은 효율은 회전수 132 rpm에서 80.5 %이다. 직선 블레이드의 와류 유속은 개수로 유입구의 평균 유속보다 약 2.8배 더 크게 나타난다.

Keywords

References

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