Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Control of cavitation in Venturi using hemispherical bump

반구형 융기부를 이용한 벤투리에서의 캐비테이션 제어

  • Jongbin Hwang (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) ;
  • Yisu Shin (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) ;
  • Jooha Kim (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology)
  • Received : 2023.06.24
  • Accepted : 2023.07.27
  • Published : 2023.07.31
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Abstract

In this study, we investigated how the performance of a Venturi changes when a hemispherical bump is applied to the divergent part of the Venturi tube and what causes the performance difference. The Venturi-tunnel experiment was conducted in the Reynolds number range of 0.2 × 105 - 1.2 × 105 and cavitation number range of 0.9 - 10. The bump was found to reduce the pressure loss coefficient and increase the discharge coefficient by shortening the cavitation length. The decrease in the cavitation length by the bump was explained by the strengthening of the re-entrant jet. The wake generated from the hemispherical bump seems to increase the adverse pressure gradient on the Venturi surface, thereby strengthening the re-entrant jet.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부의 집단연구지원사업(2021R1A4A1032023)을 통해 한국연구재단의 지원받아 수행되었으며, 이에 감사드립니다.

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