METHOD FOR GENERATING ULTRA-HIGH TEMPERATURE AND HIGH PRESSURE CAVITATION, METHOD FOR IMPARTING COMPRESSIVE RESIDUAL STRESS ONTO SURFACE OF SUBSTANCE AND METHOD FOR CHANGING GEOMETRICAL SHAPE, MECHANICAL CHARACTERISTICS AND CORROSION RESISTANCE OF THE SURFACE, AND DEVICE FOR GENERATING ULTRA-HIGH TEMPERATURE AND HIGH PRESSURE CAVITATION

摘要

To provide a method for generating ultra-high temperature and high pressure cavitation, a method for imparting a compressive residual stress onto the surface of a substance and a method for changing a geometrical shape, mechanical characteristics and corrosion resistance of the surface, and a device for generating ultra-high temperature and high pressure cavitation.SOLUTION: In a method for generating ultra-high temperature and high pressure cavitation, a water jet is ejected from an ejection nozzle 20, flow cavitation is generated, a swirling flow is imparted to the flow cavitation, thereby, a bubble radius on the flow cavitation increases, at the same time, the number of bubbles increases, a position at which the flow rate of the flow cavitation of plural bubbles having a large radius is a predetermined movement speed or less is radiated with ultrasonic wave, and a high-temperature reaction field of the flow cavitation which contains the high-temperature reaction field generated by repeating expansion/contraction according to radiation of ultrasonic wave is distributed on a position separated from the ejection nozzle 20.SELECTED DRAWING: Figure 1