Experimental study of aerated characteristics in cavitation region of high velocity flow

The aerated behaviours in cavitation region of high velocity flow through the non-circulating water tunnel are investigated by using the advanced experimental facilities in the hydraulics laboratory at Zhejiang University of Technology.Variations in pressure with and without aeration in cavitation region are measured and the compressible characteristics of pressure waveforms and relation between Mach number and compression ratio are analyzed;the time-averaged pressure profiles of different air concentration in cavitation erosion region are measured,the variations of the pressure with air concentration and effects of back pressure on cavitation erosion are analyzed;the relations between least air concentration to prevent cavitation erosion and flow velocity are proposed;the cavitation numbers with and without aeration in cavitation region are compared.