Numerical Simulation of High Velocity Waterjet Characteristics and Impact Pressure

Abstract:

This paper presents a numerical simulation approach to analyze high velocity waterjet characteristics and impact pressure. For the complexity of waterjet formation in air, multiphase mixture flow model is used, and the simulation is performed in FLUNET software. The simulation includes the hydrodynamic characteristics and pressure distribution of high velocity waterjet in air. The decay of pressure at different distance along centerline under different pump pressure is analyzed and the length of the initial region of waterjet is determined. In addition, the impact pressure of waterjet at different stand-off distance is also simulated, and the impact pressure distribution and its changing tendency with the stand-off distance are obtained. This paper provides theoretical parameters for waterjet incremental sheet metal forming.

• Periodical: Applied Mechanics and Materials (Volume 109)
• Pages: 551-556
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.109.551
• Online since: October 2011
• Authors: Qun Luo, Kai He, He Mao, Jiu Hua Li, Quan Chang Li, Ruxu Du
• Keywords: Computational Fluid Dynamics (CFD), Impact Pressure, Multiphase Flow, Waterjet, Waterjet Incremental Sheet Metal Forming

References

[1] Hideo ISEKI, Flexible and incremental bulging of sheet metal using high speed water jet, JSME International Journal, (2001)

DOI: 10.1299/jsmec.44.486

[2] Rajaratnam, N., P.M., Rizvi, S.A.H., Smy, P.R., 1994.Experimental study of very high velocity circular water jets in air. Journal of Hydraulic Research 32(3), 461-470.

DOI: 10.1080/00221689409498746

[3] Rajaratnam, N., Albers, C., 1998. Water distribution in very high velocity water jets in air. Journal of Hydraulic Engineering 124 (6), 647–650.

DOI: 10.1061/(asce)0733-9429(1998)124:6(647)

[4] Leach, S.J., Walker, G.L., Smith, A.V., Farmer, I.W., Taylor, G., 1966. Some aspects of rock cutting by high speed water jets. Philosophical Transactions of the Royal Society of London 260 (1110), 295–310.

[5] Hashish, M., duPlessis, M.P., 1979. Prediction equations relating high velocity jet cutting performance to standoff distance and multiphasses. ASME Journal of Engineering for Industry 101, 311–318.

DOI: 10.1115/1.3439512

[6] Guha, A., Barron, R.M., Balachandar, R., 2010. Numerical simulation of high speed turbulent water jets in air. Journal of Hydraulic Research 48 (1), 119–124.

DOI: 10.1080/00221680903568667

[7] He Mao, Qun Luo, Kai He, 2011.Theoretical and Experimental Analysis on Deformation of Sheet Metal under Waterjet Impact Loading. ICIA International Conference.

DOI: 10.1109/icinfa.2011.5949005

[8] FLUENT 12.0.26 User Manual.