Abstract
Recently, abrasive jet machining is used widely to process brittle materials, and at that time a conventional nozzle, circular one is used commonly. But, the cutting performance of circular nozzle is not sq good to process a large area and then the use of a rectangular nozzle, slot nozzle, is considered. In this study, in order to improve the cutting performance of abrasive jet machining nozzle a new rectangular nozzle with a large aspect ratio is proposed and the flow characteristics and cutting performance are examined precisely by experimental and numerical analyses. Main results show that (1) setting circular vane in the rectangular nozzle perpendicular to the stream can diffuse particle-flow uniformly at the nozzle exit and then particle velocity distribution becomes uniform, (2) expanding the nozzle outlet at an angle uniform air and particle velocity distributions at the nozzle exit can be obtained, (3) in spite of setting obstacles in the nozzle a fine cutting efficiency can be obtained comparing with the conventional circular abrasive jet machining nozzle. It will be shown that the new rectangular nozzle has a high cutting performance comparing with a conventional circular nozzle.
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