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마이크로 초음속제트의 충돌유동과 레이저 가공 응용에 관한 연구
민성규(Seong-Kyu Min),유동옥(Dong-Ok Yu),이열(Yeol Lee),정조순(Jo-Soon Cheong) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.2
Characteristics of micro-sonic/supersonic axi-symmetric jet impinging on a flat plate with a pre-drilled hole were both experimentally and numerically studied, to observe the role of assist-gas jet to eject melted materials from the cut zone in the laser machining. For various Mach numbers of the nozzle and the total pressures of the assist gas, detailed impinging jet flow structures over the plate and the variations of mass flux through the pre-drilled hole were observed. It was found that the present experimental and numerical results show a good agreement, which proves the accountability of the present work. From the present study, it was also observed that the mass flow rate through the hole was closely related with the total pressure loss caused by the Mach disc on the work piece, and that supersonic nozzle could perform more efficient roles as blowing the assist-gas jet in the laser machining, as compared to sonic nozzles.