Cavitation occurs frequently in both fluid and hydraulic machinery, and cavitation occurs from the blood flow to the turbine and the ship's propeller. Basic Process When local liquid flow pressure in the runner drops below a certain limit (current use of vaporization pressure), cavitation occurs in the liquid flow. These gas-filled or vapor-filled cavities rapidly expand, expand and prevail to high The pressure zone quickly condensed, collapse. At the same time accompanied by noise, vibration and even the erosion of the flow channel of the entire process known as cavitation phenomenon. If there is no cavitating nucleus in the liquid, the liquid can withstand a tension of 15000 atmospheres without cavitation. But in fact the water is not pure. Cavitation after birth, first with the pressure to reduce the expansion, into the high-pressure zone after 2-3 shrinkage - rebound expansion, cavitation, depression, the final liquid as a jet penetrate the vacuole. Impact velocity of micro jet may exceed 1000m / s. Bubble life cycle of about 0.003s. Bubble rupture accompanied by high temperature and pressure and other complex phenomena. Bubbles around the liquid temperature can be as high as 500-800 ℃. Pressure up to 10,000 atmospheres. At the same time, there is a kind of "sonic light".
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