Analysis of Gas Flow Dynamics in Thermal Cut Kerf Using a Numerical and Experimental Approach for Nozzle Selection

Consistency in gas flow behavior under various operating conditions is expected for uniform cutting performance in the thermal cutting process. The slope of the cut front in the kerf slot of a sample cutting material varies with the operating condition which affects the gas flow pattern. Therefore,...

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Bibliographic Details
Published in:Processes 2022-10, Vol.10 (10), p.1951
Main Authors: Tuladhar, Upendra, Ahn, Sang-Hyun, Cho, Dae-Won, Kim, Dae-Hwan, Ahn, Seokyoung, Kim, Seonmin, Bae, Seung-Hoon, Park, Tae-Kook
Format: Article
Language:English
Subjects:
Consistency
Cutting
Design and construction
Flow distribution
Gas flow
Image processing
K-omega turbulence model
Kerf
Lasers
Mathematical models
Methods
Nozzle geometry
Nozzles
Nuclear energy
Nuclear power plants
Pressure distribution
Radiation
Turbulent flow
Velocity
Visualization
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Summary:Consistency in gas flow behavior under various operating conditions is expected for uniform cutting performance in the thermal cutting process. The slope of the cut front in the kerf slot of a sample cutting material varies with the operating condition which affects the gas flow pattern. Therefore, how the nozzle exit diameter and the slope of the cut front effects gas flow behavior has been studied using the Reynolds averaged Navier–Stokes (RANS) based k–ω turbulence model. Convergent–straight-type nozzles with exit diameters φexit of 1.5 mm, 2 mm and 2.5 mm were used to study the flow patterns through the kerf slots of variable cut front slopes. The numerical simulation results were then compared with the results obtained from the Schlieren experiments. In addition, image processing was performed in the Schlieren images for clear visualization and precise comparison of the numerical and experimental data. The results confirm that a nozzle with an exit diameter of 2 mm shows a higher consistency in flow behavior in variable operating conditions.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr10101951