Quality Waterjet Newsletter 12/05/2006

Fan Jet Characteristics


Shimizu* recently published a paper on the subject of structure and erosive characteristics of fan jets. Here are the highlights.



Fan jets were produced with nozzles like the one shown in the picture. This nozzle has a conical convergent inlet section with a 84° convergent angle. The outlet face of the nozzle has a 52° triangular notch. In the center is an elliptic hole with major/minor diameters of 0.43 mm/ 0.33mm (for a nominal diameter of 0.33 mm nozzle). 


Instantaneous photographs of the fan jets, with pressure varying from 70 to 300 MPa, were taken from two directions with an exposure time of 1.5 µs. The jet shown in the picture was at pressure 300 MPa. It has a spreading angle of approximately 24°. Below a region of transparent liquid sheet is a region with streak structures of water droplets, where practical coating removal takes place.



A stationary fan jet produces a line segment type of damage on the target material. The erosive intensity is fairly even when the jet operates immediately downstream of the liquid sheet and then gradually becomes uneven as the distance increases. The erosive power of a moving fan jet is also the highest immediately downstream of the liquid sheet. Shown in the picture is the topography of a damaged mild steel specimen by a moving fan jet at 300 MPa and 400 mm/min, with a standoff of 20 mm.


* Shimizu, S. (2006) Structure and erosive characteristics of water jet issuing from fan jet nozzle, in Peter Longman (Ed.), Proceedings of the 18th International Conference on Water Jetting, Gdansk, Poland, September 2006, pp 337-345.


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