抄録
Experiments were conducted to investigate dissection ability and lifetime of spark electrodes as water jet generator. Performance of generator was evaluated pressure measurement with piezoelectric pressure transducer. 0.3 mm diameter Piano wire and 400-power diluted saline was used as opposite electrode and reactor of underwater discharge, respectively. Present experiments tried to explain on following: Relationship between counts of spark and pressure of jet with 3.5 mm of electrode gap, and pressure and measuring position with electrode after 50-75 counts of spark. Pressure was almost stable with 3.5 mm of gap until 80 counts. Hence, we can estimate that dissection ability of jet can be kept in the range of 40-180 counts. In relationship between pressure and measuring position, measured pressure at 2 mm from nozzle tip was higher than at nearer position. We anticipate that multistep jet was produced, and pressure is higher at an interaction point of several jets.
