fnctId=thesis,fnctNo=16
고온유체의 벤츄리노즐 공동현상 수치해석
- 링크
- 10.6112/kscfe.2021.26.2.039
- 작성자
- 김동현
- 저자
- 최덕규, Thanh-Hoang Phan, 박성호, 김동현, 박원규
- 발행사항
- 한국전산유체공학회지 Vol. 26, No. 2, pp.39-49
- 발행일
- 2021-06
- 국문초록
- 영문초록
- Understanding cavitation dynamics considering thermodynamic effect is critical to handle specific cavitation phenomena such as high temperature fluid flow or cryogenic fluid flow. In this study, a numerical analysis has been performed to investigate a the Venturi nozzle cavitation characteristic at 5 different points; 40℃, 50℃, 65℃, 80℃ and 95℃. A compressible homogeneous mixture model is applied, which is based on a dual-time preconditioning method. The results show that the evolution of cavitation in the Venturi nozzle and its cyclic motion can be described by re-entrant jet behavior, which is formed at a moment when high stagnation pressure occurs at the end of the cavity. After the re-entrant jet cuts off the head of the leading part, cloud shedding cavitation detaches from the main body of the cavity and it starts a vortex motion. In addition, increasing fluid temperature from 50℃ to 80℃ makes thermal effects dominant, which suppress and interrupt further development of cavitation due to the decrease of the local vapor pressure as cavitation occurs. Nonetheless, the 95℃ case, which is almost close to the boiling point of water, induces a thick and long cavity due to its higher saturated vapor pressure value when compared to others.
- 일반텍스트
- 첨부파일