Abstract
Experimental studies are carried out to clarify the effect of nozzle shape on the structure and drilling capability of a premixed abrasive water jet in air. Flow visualization and erosion results are obtained with the use of five different nozzles: four conical nozzles with different length focus sections and a quarter circle entrance nozzle with a focus section. Erosion tests are conducted on stainless steel specimens at an injection pressure of 11.9MPa. Aluminum oxides with different grain sizes, #100 and #220, are used as abrasives. The structures of the jets are observed using instantaneous photographs. The optimum nozzle shape is determined through erosion tests and observation of the jets.
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