2008 Volume 28 Issue 11 Pages 78-85
A piston impact against a water column which is filled in a convergent nozzle can produce a high-speed impulse water jet. We analyze the behavior of such water jets with velocity of 500 m/s class in the atmosphere and its impingement on rigid wall by CIP method. The computational results are compared with the jet photograph taken by colored Schlieren method and deformation of aluminum specimen with the jet impact. Then, collision and break up of the water jets as well as shock waves around the jet are well simulated. As for the impingement of the water jet on a solid wall, it is shown that the aluminum crater is made mainly with water hammer pressure due to the jet impact. The computational result gives an explanation for the experimental fact that the crater gets deeper as the specimen is put far from the nozzle.
