@Article{fhmt.2023.041402,
AUTHOR = {Zilong Hu, Weilong Guang, Ran Tao, Ruofu Xiao, Di Zhu},
TITLE = {Study on the Fractal Characteristics of Cavitation Shedding over a Twisted Hydrofoil},
JOURNAL = {Frontiers in Heat and Mass Transfer},
VOLUME = {21},
YEAR = {2023},
NUMBER = {1},
PAGES = {161--178},
URL = {http://www.techscience.com/fhmt/v21n1/54768},
ISSN = {2151-8629},
ABSTRACT = {Cavitation and cavitation erosion often occur and seriously threaten the safe and stable operation of hydraulic
machinery. However, during the operation of hydraulic machinery, the cavitation flow field is often difficult to
contact and measure, and the shedding and development characteristics of cavitation flow are unknown. This paper
uses the Detached Eddy Simulation (DES) turbulence model and Zwart-Gerber-Belamri (ZGB) cavitation model to
conduct numerical research on the cavitation flow of a twisted hydrofoil and verifies the effectiveness of numerical
simulation by comparing it with experimental results. Then, based on the fractal dimension method, the number
and fractal dimension of the main cavitation clusters in two different views are analyzed. The research results show
that with the continuous flow of fluid, the cavitation at the tail of the hydrofoil periodically falls off, and the number
of cavitation bubbles shows a strong randomness between 1 and 2. The fractal dimension method calculates that the
frequency of cavitation bubbles falling off is 30 Hz. The fractal dimension of cavitation also fluctuates periodically.
The fractal dimension of cavitation in the side view fluctuates between 1.30–1.38, and the fractal dimension of
cavitation in the top view fluctuates between 1.31–1.42. The fractal dimension of the cavitation is closely related to
the size and shape of the cavitation. By analyzing the relationship between the cavitation development process and
the fractal dimension in the side view, we found the relationship between the development of cavitation in a cycle
and the change of fractal dimension, which is of great significance to understanding the characteristics of cavitation
flow through the image of the cavitation flow field.},
DOI = {10.32604/fhmt.2023.041402}
}