TY - JOUR
T1 - On the topology and unsteady behavior of ventilated cavitating flow over a bluff body
AU - Wang, Zhiying
AU - Lao, Tietao
AU - Yan, Guojun
AU - Wang, Jingzhu
AU - Wang, Zhan
AU - Tian, Wenbin
AU - Wang, Guoyu
AU - Wang, Yiwei
N1 - Publisher Copyright:
© The Chinese Society of Theoretical and Applied Mechanics and Springer-Verlag GmbH Germany, part of Springer Nature 2024.
PY - 2024/10
Y1 - 2024/10
N2 - The cavity topology and unsteady behavior of ventilated cavitating flow over a bluff body are investigated experimentally using high-speed imaging and particle image velocimetry measurements. It is observed that the cavity topology shows a distinct variation at different Reynold numbers (Re) for a given gas flow rate Q. For gas flow rate Q = 4.16 litres per minute (LPM), the cavity topology is substantially the same at different Re, and the separated shear layer forms the basis for the cavity breakup and shedding vortices. However, for Q = 16.67 LPM, the cavity length decreases, and the cavity topology changes from supercavity to large-scale shedding with the increasing of Re. According to the observations, the balance of gas injection and the gas leakage capacity of shedding vortices, which can be estimated by the cavitation vortex size and the vortex shedding frequency, determines the cavity topology. In addition, the proper orthogonal decomposition analysis indicates that the existence of natural cavitation in the ventilated cavitating flow mainly affects the temporal variation of shedding and makes the periodic change of vortex dynamic more complicated.
AB - The cavity topology and unsteady behavior of ventilated cavitating flow over a bluff body are investigated experimentally using high-speed imaging and particle image velocimetry measurements. It is observed that the cavity topology shows a distinct variation at different Reynold numbers (Re) for a given gas flow rate Q. For gas flow rate Q = 4.16 litres per minute (LPM), the cavity topology is substantially the same at different Re, and the separated shear layer forms the basis for the cavity breakup and shedding vortices. However, for Q = 16.67 LPM, the cavity length decreases, and the cavity topology changes from supercavity to large-scale shedding with the increasing of Re. According to the observations, the balance of gas injection and the gas leakage capacity of shedding vortices, which can be estimated by the cavitation vortex size and the vortex shedding frequency, determines the cavity topology. In addition, the proper orthogonal decomposition analysis indicates that the existence of natural cavitation in the ventilated cavitating flow mainly affects the temporal variation of shedding and makes the periodic change of vortex dynamic more complicated.
KW - POD
KW - Ventilated cavitating flow
KW - Vortex shedding
UR - http://www.scopus.com/inward/record.url?scp=86000210944&partnerID=8YFLogxK
U2 - 10.1007/s10409-024-24082-x
DO - 10.1007/s10409-024-24082-x
M3 - Article
AN - SCOPUS:86000210944
SN - 0567-7718
VL - 40
JO - Acta Mechanica Sinica/Lixue Xuebao
JF - Acta Mechanica Sinica/Lixue Xuebao
IS - 10
M1 - 324082
ER -