Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Comparative study of cavitating and non-cavitating flow fields around a circular cylinder using PIV

PIV를 이용한 원형 실린더의 공동 및 비공동 유동장 비교 연구

  • Sion Jin (Department of Autonomous Vehicle System Engineering, Chungnam National University) ;
  • Ji-Woo Hong (Department of Autonomous Vehicle System Engineering, Chungnam National University) ;
  • Byoung-Kwon Ahn (Department of Autonomous Vehicle System Engineering, Chungnam National University)
  • Received : 2025.04.30
  • Accepted : 2025.05.26
  • Published : 2025.05.31
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Abstract

This experimental study was conducted to evaluate and compare the characteristics of non-cavitating and cavitating flow fields under identical Reynolds number conditions. Using a circular cylinder, the internal pressure of the cavitation tunnel was adjusted to vary the cavitation number under the same velocity conditions, thereby creating non-cavitating and cavitating flow fields. The wake flow was measured using Particle Image Velocimetry (PIV). The vortex structures, which were symmetric about the centerline of the flow field, were evaluated based on the streamlines of the mean flow field, and the locations of the recirculation regions were compared. A comparison of the velocity components showed that the horizontal and vertical velocity components, u/U and v/U, had smaller values in the cavitating flow field, and the point where u/U recovered to positive values appeared closer to the cylinder. Under non-cavitating conditions, the non-dimensional vorticity remained relatively constant, whereas under cavitating conditions, the non-dimensional vorticity tended to decrease as cavitation developed, with an 11% reduction observed along the centerline.

Keywords

Acknowledgement

이 연구는 2025년 정부(방위사업청)의 재원으로 국방과학연구소의 지원을 받아 수행된 미래도전국방기술 연구개발사업(No. 915071101)과 한국산업기술진흥원의 지원을 받아 수행된 연구임(RS-2023-KI002688, 2025년 산업혁신인재성장지원사업).

References

  1. Foeth, E. J., Van Doorne, C. W. H., Van Terwisga, T., and Wieneke, B., 2006, "Time resolved PIV and flow visualization of 3D sheet cavitation," Experiments in Fluids., Vol. 40, pp. 503∼513. https://doi.org/10.1007/s00348-005-0082-9
  2. Iyer, C. O., and Ceccio, S. L., 2002, "The influence of developed cavitation on the flow of a turbulent shear layer," Physics of Fluids., Vol. 14(10), pp. 3414∼3431. https://doi.org/10.1063/1.1501541
  3. Kim, S., Cheong, C., Park, W. G., and Seol, H., 2016, "Numerical investigation of cavitation flow around hydrofoil and its flow noise," Transactions of the Korean Society for Noise and Vibration Engineering., Vol. 26(2), pp. 141~147. https://doi.org/10.5050/KSNVE.2016.26.2.141
  4. Jeong, S. J., Hong, S. Y., Song, J. H., Kwon, H. W., Park, I. R., Seol, H. S., and Kim, M. J., 2019, "Study on Cavitation Noise Predictions for an Elliptic Wing," Journal of the Korean Society of Marine Environment & Safety., Vol. 25(6), pp. 757∼764. https://doi.org/10.7837/kosomes.2019.25.6.757
  5. Chung, J., and Cho, Y., 2015, "Visualization of ventilated supercavitation phenomena around a moving underwater body," Journal of the Korean Society of Visualization., Vol. 13(1), pp. 26~29. https://doi.org/10.5407/JKSV.2015.13.1.026
  6. Hong, J. W., Jeong, S. W., and Ahn, B. K., 2019, "PIV Measurements of Non-cavitating and Cavitating Flow in Wake of Two-dimensional Wedge-shaped Submerged Body," Journal of Ocean Engineering and Technology., Vol. 33(1), pp.26~32. https://doi.org/10.26748/KSOE.2018.066
  7. Hong, J. W., Jeong, S. W., and Ahn, B. K., 2021, "Visualization of Vortex Flow around Coolant Outlets Using PIV and LDV," Journal of the Korean Society of Visualization., Vol. 19(3), pp. 1–7.
  8. Doh, D. H., Hwang, T. G., and Lee, S. J., 2007, "Measurement of a Ship's Propeller Wake with Stereoscopic-PIV and Stereoscopic-PTV," Journal of the Korean Society of Visualization., Vol. 5(2), pp. 26–32. https://doi.org/10.5407/JKSV.2007.5.2.026
  9. Roshko, A., 1993, "Free shear layers, base pressure and bluff-body drag," Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences., Vol. 441(1913), pp. 1∼20.