Design and characteristic analysis of supersonic nozzles for high gas pressure laser cutting

Hau Chung Man, J. Duan, Tai Man Yue

Research output: Journal article publicationJournal articleAcademic researchpeer-review

59 Citations (Scopus)


A new method for the design of a supersonic nozzle tip for high gas pressure laser cutting is presented. The design is based on the theory of gas dynamics in that the potential energy of high stagnation pressure is converted totally into effective velocity energy so that a high momentum of the exit jet can be obtained for improving the capability of removing molten debris quickly and minimizing the heat-affected zone of the cut edges. Another purpose is to increase the cutting speed and minimize gas consumption under high pressure cutting conditions. The behavior of the exit jet under the condition of stagnation gas pressure ranging from 4 ∼ 16 bar are investigated by means of a computer simulation test. The results of theoretical analysis and of the simulation test show that for a supersonic jet, each sectional diameter and curve contour of the supersonic nozzle must be designed strictly according to the theory of gas dynamics. An exit jet with high momentum, good uniform and a tidy boundary can be obtained and the tolerance of the working distance between the nozzle tip and the workpiece can be increased.
Original languageEnglish
Pages (from-to)217-222
Number of pages6
JournalJournal of Materials Processing Technology
Issue number1-3
Publication statusPublished - 1 Jan 1997


  • High gas pressure
  • Laser cutting
  • Supersonic nozzle

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering


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