Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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An Experimental Study of Pressure Variation in Pipe Flow according to Residual Air Condition

잔류공기조건에 따른 관 내 유동의 압력변화에 관한 실험적 연구

  • Park, Jaegon (Korea Institute of Hydrological Survey) ;
  • Lee, Kyungsu (River Experiment Center, Department of Hydro Science and Engineering Research, Korea Institute of Engineering and Building Technology) ;
  • Ko, Joo Suk (Department of Civil Engineering, Changwon National University) ;
  • Lyu, Siwan (Department of Civil Engineering, Changwon National University)
  • 박재곤 (한국수자원조사기술원) ;
  • 이경수 (한국건설기술연구원 수자원하천연구본부 하천실험센터) ;
  • 고주석 (창원대학교 토목공학과) ;
  • 류시완 (창원대학교 토목공학과)
  • Received : 2022.06.29
  • Accepted : 2022.07.26
  • Published : 2022.08.31
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Abstract

Sudden intrusion of a large amount of surface water into a flood defensive tunnel or pipeline system can compress the residual air. The compressed air may explode along with water through the inlet or air vent, resulting in hydraulic capacity degradation or safety hazards. This study aims to investigate the behavior of compressed air body in pipelines according to the residual air condition with a series of laboratory experiments measuring pressure variation. It has been found that flow characteristics and residual air conditions have a dominant influence on the magnitude and periodicity of the pressure variation. A proper measure to effectively control the residual air is required for securing the design capacity of flood defensive pipeline systems, since the peak pressure is predominantly affected by residual air conditions.

Keywords

Acknowledgement

This research was supported by Changwon National University in 2021~2022.

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