Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Analysis on Rainfall Distribution in a Large Experimental Rainfall Simulator with Fixed Nozzle Arrangement

고정식 노즐 배치를 가진 대형 강우모사장치의 강우 분포 특성 분석

  • Lee, Chan-Joo (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Jong Pil (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Jin-Won (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Won (Hydro Science and Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • 이찬주 (한국건설기술연구원 수자원하천연구소) ;
  • 김종필 (한국건설기술연구원 수자원하천연구소) ;
  • 이진원 (한국건설기술연구원 수자원하천연구소) ;
  • 김원 (한국건설기술연구원 수자원하천연구소)
  • Received : 2015.11.09
  • Accepted : 2015.12.04
  • Published : 2015.12.31
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Abstract

This study provides results from the experiment on the rainfall distribution using a large Experimental rainfall simulator with fixed nozzle arrangement. Results from the experiment on the nozzles which are crucial for rainfall simulation show standard errors expressed as percentage are 0.15~0.38% at the indoor flow testing apparatus and 0.37~0.59% at the KICT-ERS. To examine spraying range of the nozzles, radial and triangular rainfall measurement test are done. In the radial test, coefficient of uniformity (CU) lies in 0.348~0.657 in the single nozzle spraying case, while it increases up to 0.854~0.895 in the seven nozzle spraying case. This means increase of both rain rate and uniformity by means of superimposition of spraying. The CU of the triangular test falls to 0.845~0.896. The results from the experiment on the whole-scale of the KICT-ERS show that CU exceeds 0.7 for every case except the one experimental condition where a $1.5{\phi}$ nozzle is used. The CU tends to increase with increasing rainfall intensity. Comparison with the previous studies shows that KICT-ERS provides rainfall distribution above average CU.

본 논문에서는 고정식 노즐 배치를 가진 대형 강우모사장치(KICT-ERS)와 이를 이용한 강우 분포 실험결과를 분석하였다. 강우 분사에 영향을 미치는 노즐 유량 실험 결과 실내 장치를 이용한 표준오차의 백분율은 0.15~0.38%였으며, KICT-ERS에 장착한 오차는 0.37~0.59%로 나타났다. 노즐의 분사 범위를 검토하기 위한 방사형과 삼각형 실험을 실시하였다. 방사형 실험에서 1개 노즐 분사시 균일계수가 0.348~0.657이었으나 주변 노즐을 포함할 경우 균일계수가 0.854~0.895로 높아져서 노즐 분사의 중첩에 의한 강우강도 증가 및 균일도 제고가 확인되었다. 삼각형 실험 결과의 균일계수는 0.845~0.896으로 나타났다. KICT-ERS 전체 범위에 대한 실험 결과 $1.5{\phi}$ 노즐의 1개 실험 케이스를 제외하면 모든 조건에서 균일계수는 0.7을 넘었으며, 균일계수는 강우강도가 증가함에 따라 높아지는 특성을 보였다. 기존 연구와의 비교 결과 KICT-ERS는 대체로 평균 이상의 균일계수를 제공하는 것으로 나타났다.

Keywords

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