Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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A Study on the Simulation Analysis of Nozzle Length and Inner Spiral Structure of a Waterjet

워터젯 노즐의 길이와 내부 나선 구조 유무에 따른 유체거동에 관한 전산해석

  • Gwak, Cheong-Yeol (Engineering Research Center for Net Shape and Die Manufacturing, Pusan National University) ;
  • Shin, Bo-Sung (Department of Optics and Mechatronics Engineering, Department of Cogno-mechatronics Engineering, Convergence Research Center of 3D Laser-aided Innovative Manufacturing Technology, Pusan National University) ;
  • Go, Jeung-Sang (Department of Mechanical Engineering, Pusan National University) ;
  • Kim, Moon-Jeong (Department of Mechanical Engineering, Pusan National University) ;
  • Yoo, Chan-Ju (Engineering Research Center for Net Shape and Die Manufacturing, Pusan National University) ;
  • Yun, Dan-Hee (Engineering Research Center for Net Shape and Die Manufacturing, Pusan National University)
  • 곽청렬 (부산대학교 대학원 첨단정밀공학협동과정) ;
  • 신보성 (부산대학교 광메카트로닉스공학과/ 인지메카트로닉스공학과 대학원/ 3차원혁신제조센터) ;
  • 고정상 (부산대학교 기계공학부) ;
  • 김문정 (부산대학교 기계공학부) ;
  • 유찬주 (부산대학교 대학원 첨단정밀공학협동과정) ;
  • 윤단희 (부산대학교 대학원 첨단정밀공학협동과정)
  • Received : 2016.06.30
  • Accepted : 2016.09.13
  • Published : 2017.02.28
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Abstract

It is well known that water jetting is now widely used in the advanced cutting processes of polymers, metals, glass, ceramics, and composite materials because of some advantages, such as heatless and non-contacting cutting different from the laser beam machining. In this paper, we proposed the simulation model of waterjet by lengths and the inner spiral structure of the nozzle. The simulation results show that the outlet velocity of the nozzle is faster than the inlet. Furthermore, we found rapid velocity reduction after passing through the outlet. The nozzle of diameter ${\phi}500$ and length 70mm, shows the optimal fluid width and velocity distribution. Also, the nozzle with inner spiral structure shows a Gaussian distribution of velocity and this model is almost twice as fast as the model without spiral structure, within the effective standoff distance (2.5 mm). In the future, when inserting abrasive material into the waterjet, we plan to analyze the fluid flow and the particle behavior through a simulation model.

Keywords

References

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