Prediction Equations Relating High Velocity Jet Cutting Performance to Stand Off Distance and Multipasses

[+] Author and Article Information
M. Hashish, M. P. du Plessis

Dept. of Mechanical Engineering, Concordia University, Montreal, Canada

J. Eng. Ind 101(3), 311-318 (Aug 01, 1979) (8 pages) doi:10.1115/1.3439512 History: Received July 15, 1978; Online July 15, 2010


A previously derived equation for continuous jet penetration of solids (1) is combined with empirical equation for jet spreading and velocity decay in air. These equations are used to study the effects of stand off distance and multipasses on cutting depth, volume removal and specific energy. Predicted trends are compared with limited published experimental data for wood, limestone and coal. Predicted cutting depths for single and multipass cutting are in reasonable agreement with measurements. Volume removal predictions are lower than measured values because other mechanisms such as brittle fracture and reverse jet flow not included in the present penetration model contribute to total material removal by widening of the kerf beyond the effective jet width. The equations confirm the existence of optimum stand off distance and the benefits of multipasses for certain combinations of jet, material and cutting speed parameters. Numerical values of the governing nondimensional groups for optimum performance are identified for conditions encountered in typical industrial applications.

Copyright © 1979 by ASME
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In