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Flow Characteristics and Cavitation Effect of the Submerged Water Jet Discharged from a Central-Body Nozzle

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To assess the impingement capability of water jet, submerged water jet discharged from a centralbody nozzle is investigated. Efforts are devoted to both the wavy jet edge and the cavitation phenomenon involved. Three configurations of the central body are examined and jet pressure is fixed at 15 MPa. Jet edge is visualized using high speed photography. Numerical simulation is performed to extract flow parameter distributions in the jet stream and to predict cavity profiles. Furthermore, an impingement experiment with target sandstone samples is conducted as well. The results indicate that both lateral fluctuation amplitude and frequency of the jet stream vary with axial position of the central body. Cavitation tongues of different stream wise dimensions are manifested in the wake flows downstream of the central body. In case of the downstream end of the central body parallel with nozzle outlet section, the largest stream wise dimension of cavitation zone is obtained. Relative to the round nozzle with the same equivalent outlet diameter, the central-body nozzle yields preferable impinging effect.
Cite this paper
Liu, H. , Shao, Q. and Kang, C. (2014) Flow Characteristics and Cavitation Effect of the Submerged Water Jet Discharged from a Central-Body Nozzle. World Journal of Engineering and Technology, 2, 281-288. doi: 10.4236/wjet.2014.24029. 
 

[1] Summers, D.A. (1983) Consideration in the Comparison of Cavitating and Plain Water Jets. Proceedings of the 2nd US Water Jet Conference, Missouri, 24-26 May 1983, 178-183.
[2] Hocheng, H. and Weng, C.H. (2002) Hydraulic Erosion of Concrete by a Submerged Jet. Journal of Materials Engineering and Performance, 11, 256-261.
http://dx.doi.org/10.1361/105994902770344033
[3] Iio, S., Takahashi, K., Haneda, Y. and Ikeda, T. (2008) Flow Visualization of Vortex Structure in a Pulsed Rectangular Jet. Journal of Visualization, 11, 125-132. http://dx.doi.org/10.1007/BF03181927
[4] Xiang, W.Y., Li, X.H. and Lu, Y.Y. (2009) Cavitation Capacity of Submerged Abrasive Water Jets. Journal of Chongqing University, 32, 299-302.
[5] Kang, C., Wang, W.F., Zhang, F. and Yang, M.G. (2010) Experiment Study of Free Fan Water Jet Flow by Using PDPA. Chinese Journal of Hydrodynamics (Series A), 25, 822-829.
[6] Hutli, E., Alteash, O., Raghisa, M.B., Nedeljkovic, M.S. and Ilic, V. (2013) Appearance of High Submerged Cavitating Jet: The Cavitation Phenomenon and Sono-Luminescence. Thermal Science, 17, 1151-1161.
[7] Shiau, B., Yang, C.L. and Tsai, B. (2007) Experimental Observations on the Submerged Discharge of Brine into Coastal Water in Flowing Current. Journal of Coastal Research, 50, 789-793.
[8] Kang, C., Zhang, F., Liu, D. and Yang, M.G. (2010) Statistical Characteristics in Water Jet Discharged from a Central-Body Nozzle. Proceedings of ASME FEDSM-ICNMM, Montreal, 1-5 August 2010, 137-143.
[9] Soyama, H., Yanauchi, Y. and Sato, K. (1996) High-Speed Observation of Ultrahigh-Speed Submerged Water Jets. Experimental Thermal and Fluid Science, 12, 411-416.
http://dx.doi.org/10.1016/0894-1777(95)00124-7
[10] Kang, C., Zhang, F. and Yang, M.G. (2011) Experimental and Statistical Analysis of Water Jet Discharged from an Annular Nozzle. Journal of Experiments in Fluid Mechanics, 25, 7-12.
[11] Singhal, A.K., Athavale, M.M. and Li, H.Y. (2002) Mathematical Basis and Validation of the Full Cavitation Model. Journal of Fluids Engineering, 124, 617-624. http://dx.doi.org/10.1115/1.1486223               eww141120lx
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