首页|Effect of a modified impact angle of an ultrasonically generated pulsating water jet on aluminum alloy erosion using upward and downward stair trajectory
Effect of a modified impact angle of an ultrasonically generated pulsating water jet on aluminum alloy erosion using upward and downward stair trajectory
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NSTL
Elsevier
Characteristic of an ultrasonically generated pulsating water jet (PWJ) is a liquid column, the structure of which can be divided - in terms of the standoff distance of the nozzle z [mm] - into imaginary efficiency zones (initial, transition/main, final). This fact is caused by the flow gradually developing into individual pulses. The structure of the PWJ and, consequently, the nature of its interaction with the material depends on the values of technological parameters (standoff distance of the nozzle, fluid pressure, frequency of ultrasonic generation, length of the acoustic chamber, nozzle diameter, feed rate). A geometric parameter - the impact angle α [°], plays an important role, too. To date, no research has been conducted to investigate the effect of a changed impact angle of the ultrasonically generated PWJ on material erosion. Therefore, the subject matter of this study is to investigate the effect of modified impact angle of the PWJ (α = 90°, ±85°, ±75°, ±65°, ±55°, ±45°) on disintegration (groove depth hd [μm], mass loss Δm [g]) of the aluminum alloy EN AW 6060 with upward (+) and downward (-) stair motion of the nozzle over the material with the standoff distance of the nozzle ranging between z = 10-115 mm at the frequency of fs = 40 kHz, the pressure p = 40 MPa and the feed rate v = 2 mm/s. The experiment showed a semicircular pattern of grooves created in this way. The erosion rate under the perpendicular impact (α = 90°) was not the greatest due to development of a thicker protective layer of fluid. The PWJ downward motion showed greater disintegration capacity under all impact angles, probably due to the plowing effect.
Pulsating water jetImpact angleStandoff distanceErosionAluminum alloyMicrotopography
Dominik Cuha、Michal Hatala
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Faculty of Manufacturing Technologies with the seat in Presov, Technical University of Kosice
NSTL
Elsevier
