Studying the Effect of Submergence Depth on Scour Pattern of Hydraulic Jet Downstream

Document Type: Original Article

Authors

Abstract

This research aims to study jet downstream scour model under the influence of changes of water level. It also studies and analyzes different parameters and components of diffusion of submerged jet flow in an acceptor fluid and scour hole dimensions. To achieve the objectives, a physical model was made in proportion to the research title. With the Froude number increasing in a nozzle discharge, flow velocity increases in the acceptor liquid. Moreover, with the Froude number increasing, the overall flux velocity increases by the same rate. Velocimetry experiments were carried out at different submergence depths to study the effect of submergence depth of an acceptor liquid on discharge velocity of a nozzle. With respect to the discharge velocity of the nozzle for submergence depths of 10, 30, and 50 times bigger than the nozzle diameters, it was specified that the measured velocities were consistent with each other and changes of depth had no effects on discharge velocity.

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Adduce, C., and Mele, P. (2004). Local scour by submerged turbulent jets. paper presented at International Conference on Hydroscience and Engineering 2004, Intern. Association for Hydraulic Reseach and Engineering, Brisbane, Queensland, Australia, 31 May to 3 June, pp:147-154.

Ahadian, J. and Musavi Jahromi, S. H. (2008). Investigation of variation of efflux momentum in shallow receiving water by using FLOW-3D. Proceeding of the International Symposium of Water Resource Management, Tabriz, Iran, (ISWRMT), pp: 551-557.

Ahadian, J. and Musavi Jahromi, S. H. (2009). Effect of jet hydraulic properties on geometry of trajectory in circular buoyant jet in the static ambient flow. Journal of applied Sciences, 9 (21), pp: 3843-3849.

Ali, K. H. M. and Lim, S. Y. (1986). Local scour caused by submerged wall jet. Proceedings of the Institution of Civil Engineers, 2 (81), pp: 607-645.

Chen, J. Y. (2001). Characteristics of check dam scour hole by free over-fall flow. Journal of the Chinese Institute of Engineers, 24 (6), pp: 673-680.

Hogg, A., Huppert, H. and Dade, W. B. (1997). Erosion by planar turbulent wall jets. Journal of Fluid Mechanics, 338, pp: 317-340.

Mehraein, M., Ghodsian, M. and Salehi Neyshaboury, S. A. A. (2009). Effect of inclination of wall jet on scour. 33rd IAHR Congress, pp: 431-439.

Peiqing, L., Jizhang, G. and Yongmei, L. (1998). Experimental investigation of submerged impinging jets in a plunge pool downstream of large dams, Science in China Series E: Technological Sciences, 41(4), pp: 357-365.