Cavitation Peening By Using Cavitating Jet In Air

Author:  H Soyama, K Homma
Source:  Conf Proc: ICSP-9 (pg 202-207)
Doc ID:  2005073
Year of Publication:  2005
Abstract:  
ABSTRACT Cavitation impacts, which normally cause severe damage in hydraulic machinery, can be utilized for peening without shots. Peening by using the cavitation impacts is called cavitation peening. In case of cavitation peening, the cavitation was produced by a cavitating jet, which was a high-speed water jet injecting into water filled chamber. In the present paper, "a cavitating jet in air" without any water filled chamber was realized by injecting a high-speed water jet into a low-speed water jet, which was injecting into air, using concentric nozzle. The injecting condition of the cavitating jet in air was optimized by measuring jet capability. The suitable cavitating jet in air was more powerful compared with a normal cavitating jet, which was the cavitating jet in water. The improvement of fatigue strength by the cavitating jet in air was demonstrated.