Pulsation of cavitating vortex rings in water

We present the results of experimental investigations of the cavitating vortex rings (CVRs) formed upon throwing a water column (jet) from an immersed cylindrical barrel with a diameter of 20–40 mm and a length of 30–100 mm. The dynamics of the CVR formation and propagation in water in the form of toroidal cavitation bubbles has been studied as dependent on the initial jet velocity. It is established that CVRs shaped as hollow tori are formed at a jet velocity above 2 m/s. At a jet velocity above 6 m/s, the CVRs exhibit radial pulsations, which have been observed for the first time with the aid of optical methods.