绕空化器回转体通气空泡流态特征实验研究

To investigate the transition mechanism of a ventilated cavitating flow pattern, high-speed flow visualization technology was used to observe the process and structure of the ventilated cavitating flow around the axisymmetric body of a disk cavitator. The effects of the air entrainment coefficient and the cavitator diameter on the ventilated cavitating flow pattern were studied. The results show that with the increase of the air entrainment coefficient, the cavity development process can be divided into three stages: the rapid growth stage, the slow growth stage, and the relatively stable stage. The increase of the air entrainment coefficient intensifies the asymmetry of the cavity, and the air leakage mode at the cavity tail gradually changes from re-entrant jet flow mode to twin-vortex tube mode. Meanwhile, a ventilated flow pattern gradually develops from a foamy cavity to a completely transparent and stable supercavity. Compared with the small-scale cavitator model at the same Froude number, the minimum air entrainment rate for forming a continuous transparent cavity increases in the large-scale cavitator model. Thus, the distribution area of the ventilated cavitating flow pattern and the growing trend of the cavity also change.