Abstract
A ventilated sheathed nozzle for producing abrasive suspension jets (ASJs) has been developed as a means of extending the effective standoff distance and improving the cutting capabilities under submerged conditions. In the present investigation, submerged cutting tests were conducted with aluminum specimens at a jetting pressure of 30 MPa to clarify the effects of sheath length and air flow rate on the cutting capability of ASJs. The nozzle used in the tests was a conical convergent nozzle with a focusing section. For the range of experimental conditions used, improved cutting was achieved with a shorter nozzle sheath. High-speed observations and measurements of the flow rate distribution of water jets were also carried out at a jetting pressure of 10 MPa in order to investigate the flow structure of air coated ASJs under submerged conditions. The cutting capability was found to drastically improve for small standoff distances since air coated ASJs are formed downstream of the sheath exit.
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