Investigation of the pulsed waterjet flow field inside and outside of the nozzle excited by ultrasonic vibration
- 62 Downloads
The pulsed waterjet flow inside and outside of the nozzle is investigated by numerical and experimental methods. This pulsed waterjet is generated by the external vertical vibration excitation at the end of the nozzle which causes the deformation of the nozzle inner wall. The pulsed waterjet flow distribution is simulated by CFD software FLUENT. The unsteady model of the solver is used. The simulation results express that there are alternative high-pressure zone and low-pressure zone inside and outside the waterjet nozzle, and the length of the waterjet core zone offset the nozzle also changes simultaneously. The pulsations of the waterjet velocity along the nozzle axis and at the outlet are more violent than which are without the boundary deformation vibration. By analyzing the influence of the amplitude and frequency of the vibration, the results show that the larger vibration amplitudes are, the greater pulsations of the waterjet velocity producing. And the maximum pressure of the high-pressure zone and low pressure zone is slowly reducing with the vibration frequency increasing. The experiment device has been set up to verify the simulation results of flow fields of the pulse waterjet; the images obtained in the experiment indicate that the flow field is well matched with the simulation result.
KeywordsPulsed waterjet Simulation Flow field The unsteady model
Unable to display preview. Download preview PDF.
The work is financially supported by National Natural Science Foundation of China (51405274) and Program for the Young Development of Shandong University of Technology.
- 1.Yuan P, Xu WL, Lv YL, Fu YF (2015) Numerical simulation of structural parameters distribution on three Vera Laval nozzle flow field. Oil-Gas Field Surface Engineering 53(9):31–33Google Scholar
- 8.Hashish M., Chillman A., Ramulu M. (2005) Waterjet peening at 600MPa: a first investigation. Asme International Mechanical Engineering Congress & Exposition: 45-52Google Scholar
- 12.Chahine GL, Kalumuck KM, Frederick GS (1995) The use of self-resonating cavitating water jets for rock cutting. In: Proceedings 8th American Water Jet Conference 77(1):765–778Google Scholar
- 13.Vijay M.M., Foldyna J., Remisz J. (1993) Ultrasonic modulation of high-speed waterjets. In: Proceeding of International Conference on Geomechanics Netherlands: 327–332Google Scholar
- 16.Wang HG, Zhu ZW, Ge LS (2015) Analog local vibration of the inner tube wall jet flow field. J Engineering Thermal Energy Power 30(1):37–41Google Scholar
- 17.Ni J.R. (1991) The basic theory of solid-liquid two-phase flow and their new application. Technology Publishing HouseGoogle Scholar
- 18.Fluent 6.3 user's guide (2008) The Fluent Inc.Google Scholar