Device for testing underwater high-speed object generated along with supercavity

Abstract

The invention discloses a device for testing an underwater high-speed object generated along with supercavity, which comprises a high pressure gas source, a box body support rack, a high speed camera, an industrial personal computer, a membrane, a safety interceptor, a water tank, a water tank cover, a flat plate, a ball valve, a transmitting tube, a reinforced plate, a gas conduit, a fastening plate and a transmitting tube support rack. The object to be tested is driven and accelerated through nitrogen or helium released by the high pressure gas source and is then transmitted through the transmitting tube to enter the water tank filled with liquid, and when the object to be tested passes through the free face of the liquid from top to bottom and from bottom to top, a flow field having water inflow and water outflow generated along with the supercavity is generated. The generated supercavity flow has relatively clear inner and outer boundaries of a vapor / liquid two-phase flow, and with the help of various optical instruments and flow field visualization instruments, complex fluid dynamics behavior processes, such as the balance state of the gas inside vacuoles, the interaction of the free face and the supercavity, the instability of a vapor / liquid interface, the development of a turbulent boundary layer and the like, can be studied and comprehended.

Description

technical field [0001] The invention relates to a test device for fluid pressure in fluid mechanics, in particular to a test device for underwater high-speed objects accompanied by supercavitation. Background technique [0002] "Cavitation" is a common hydrodynamic phenomenon that occurs in regions of a liquid where the partial pressure is lower than the saturated vapor pressure at that temperature. As far as water is concerned, if the water temperature is not high, after reducing the pressure of the water surface to a certain critical value (the critical value is generally the saturated vapor pressure of the liquid) or accelerating the liquid flow to a certain speed, the microbubbles (gas) originally contained in the water will Nucleus) will expand rapidly, and then many obvious bubbles containing water vapor or other gases will be formed in the water. This is the common "cavitation phenomenon", and the generated bubbles are called "cavitation bubbles". When the water surf...

AI Technical Summary

Problems solved by technology

This kind of equipment is relatively complicated and not suitable for popular use in the laboratory; and it generally can only maintain horizontal movement, but cannot complete the task of taking into account both water exit and water entry tests

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