Computational Fluid Dynamic Analysis of Abrasive Jet Nozzles
Academic Leadership - Online Journal,
Vol. 21 No. 6 (2020): Vol-21-Issue-6-June-2020
Abrasive Jet Machining (AJM) utilizes mechanical energy and is one of the advanced machining processes. Energy in its direct form is acting for metal removal. The erosion takes place due to high speed abrasive particles mixed with carrier gas. Micro abrasive particles are propelled by a pressurized air of different velocities. AJM includes drilling, grinding, honing, and deburring. The common nozzle shapes used for machining by AJM are rectangular or circular. In the present work a conical nozzle with convergent hole is introduced. This present work investigates the flow of abrasive particles in the inlet of the convergent nozzle. A 3D model of a nozzle design and size of abrasive particles was carried out for the erosion process is done in CREO software of Computer Aided Design (CAD). The different machining conditions for the abrasive flow at inlet and outlet of the nozzle is analyzed by Computational Fluid Dynamics (CFD) simulation. The simulation results are analyzed, and the differences are identified. For each nozzle diameter (1mm, 2mm, 3mm) the analysis is made at different pressures and velocities. The influence of inlet nozzle velocity, pressure, nozzle diameter and Stand Off Distance (SOD) on the abrasive flow is investigated and the results are presented.
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