The Experiment Research On Ventilated Cavity

In recent years, all power have invested a lot of resources in researching and developing submarine-launched missiles, and ventilated cavity has an important role in submarine-launched missiles. Mostly researchers focuses on a single bubble,super-cavitation and bubble drag reduction, but there is just a little research about ventilated cavity in vertical flow. In this paper, the main content is experimental study about ventilated cavitation, and during the experiments, the high-speed optical camera captured details of the bubble formation process.. Vertical gas jet into liquid cross-flow beneath horizontal surface was observed and the physics of it was studied.In the present research, a series of experiments are first carried out to investigate the relation between the bubble formation and experiment parameter which are gas flow rate, liquid rate and other factors.Specific experimental research are the following aspects:Firstly, based on the rational experimental design, the appropriate high-speed camera system and the light source arrangement, bubbles formation images in higher quality are obtained. Through image processing, a valid argument can be obtained from bubbles images.Secondly, it is focused on ventilated cavity in vertical flow from one hole.Investigate the relation between the bubble formation and hole diameter , vertical flow rate , gas flow rate. Through investigating dimensionless number, such as Weber number, Froude number, bubble characteristic can be understand distinctly.Finally, bubble experiments from two-holes and three-hole are studied. Focus on the hole number, gas flow rate, liquid flow rate, study the effect on bubble length and stability.