Flow structures around an inclined substrate subjected to a supersonic impinging jet in laser cutting |
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Authors: | Ching-Chuan Mai Jehnming Lin |
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Affiliation: | Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan, ROC |
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Abstract: | In laser cutting, the flow structure around a substrate significantly affects the material removal rate, the cutting depth and the surface finish of the cutting front. In this paper, the phenomena of shock wave that is induced by a supersonic impinging jet emanating from a straight nozzle onto a substrate with varying inclined angles has been simulated numerically and visualized experimentally. The numerical model offers fairly good prediction in comparison with the experiments. It transpires that the angle of inclination has a significant and dramatic effect on the flow structure and that a large wall pressure with a steep gradient can be built up when the angle is large. |
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Keywords: | Laser cutting Shock wave Inclined impinging jet |
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