抄録
Experiments to investigate dissection ability and lifetime of spark electrodes as water jet generator were conducted in present study. Performance of a generator was evaluated pressure measurement with piezoelectric pressure transducer. 0.3 mm diameter Piano wire was used as opposite electrode. Reactor of underwater discharge was 400-power diluted saline. 0.2 uF capacitor, power supply of 5.94 kV and mechanical relay were used for discharge. Nozzle was stainless tube of 0.9 mm diameter and 20 mm length. Based on our preliminary studies, 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 the 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 from nozzle tip. We anticipate that multistep jet was produced, and pressure is higher at an interaction point of several jets.
