Rock cutting by pulsing water jets

Generation of pulsations in high-speed water jets enables to increase the cutting performance of water jets due to the fact that the impact pressure generated by an impact of slug of water on the target material is considerably higher than the stagnation pressure generated by corresponding continuous jet. Highly complex dynamics of the flow of pulsating water jet was studied at the Institute of Geonics in Ostrava both theoretically with aid of CFD methods and experimentally using methods of direct measurement of pressure pulsations and impact forces generated by the jet. Cutting effects of pulsing water jets were tested extensively in laboratory to verify their performance in hard rock cutting. Interaction of…