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Flow Characteristics of Two-Dimensional Supersonic Under-Expanded Coanda-Reattached Jet

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Document pages: 14 pages

Abstract: When there is a wall near the jet, it deflects and flows while beingattached to the wall owing to the Coanda effect. The flow characteristics ofthe incompressible and two-imensional (2D) Coanda-reattached jets have beenconsiderably explained. However, 2D supersonic under-expanded jets, reattachedto side walls, have not been sufficiently investigated. These jets are used ingas-atomization to produce fine metal powder particles of several micrometersto several tens micrometers. In this case, the supersonic under-expanded jetsare issued from an annular nozzle, which is set around a vertically installed circular nozzle for molten metal. The jetflow at the center cross-sectionof the annular jet resembles a 2D Coanda-reattached jet that deflects and attacheson the central axis. In this study, the flow characteristics of a supersonic under-expandedCoanda air jet from a 2D nozzle that reattaches to an offset side wall areelucidated through experiment and numerical analysis. For numerical analysis,we show how much it can express experimental results. The effects of supplypressure P0 on the flow characteristicssuch as the flow pattern, size of shock cell, reattachment distance, andvelocity and pressure distributions, etc. are examined. The flow pattern wasvisualized by Schlieren method and the velocity distribution was measured usinga Pitot tube. These results will be also useful in understanding the flowcharacteristics of a gas-atomization annular nozzle approximately.

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