Keywords: Air entrainment, Dam rehabilitation, Energy dissipation, Flood control, Inception point, Physical modeling, Roller compacted concrete (RCC), Stepped spillways, Stilling basin Published by the American Society of Agricultural and Biological Engineers, St. Energy Dissipation on Flat-Sloped Stepped Spillways: Part 1. If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options. In spite of the considerable increase in the tail water level downstream the FPS, there was no significant differences of the dissipated energy with and without the FPS for the whole system, in which the energy dissipation ranged from 14.05 to 55.91% with the FPS and ranged from 13.57 to 55.09% without it.Click on “Download PDF” for the PDF version or on the title for the HTML version. The increased value of y2/y1 increased the energy dissipation of the jump, in which the jump produced energy dissipation ranged from 8.47 to 85.38% with the existence of the FPS instead of 5.91 to 66.14% without it, with same flow conditions. This convergence of the jump lowered the head losses of the flow before the jump and then increased Froude Number, Fr, and produced higher y2/y1 value. The results show that the additional friction resistance by the FPS increased the tail water level and forced the hydraulic jump towards the sluice gate, in which the FPS produced a converging distance ranged from 0.64m to 5.34m. In each test, the hydraulic jump formed downstream the sluice gate and the FPS once placed downstream the jump and once removed, in the same test, with maintaining the same flow conditions, and measurements are taken to investigate the effect of the FPS on the jump. The system operated with flow rates ranged from 11.11 to 36.24l/s with different gate openings in 27 tests. The system (which consists of a sluice gate, FPS, and rising weir) installed in a horizontal flume of 0.3m width, 0.45m depth, and 15m length. The downstream face made with an inclination of 45o to prevent the free fall of the water. This combination of the pipes and bars made a width of 29.6cm and height of 42.6cm to fit, approximately, the flume cross sectional area dimensions. The FPS with a vertical front face consisting of 16Ã-11, rows Ã- columns, of pipes extended 10cm downstream and held by a 0.5cm, thickness, iron bars and welded together to prevent any egression of the pipes from the FPS. The FPS shaped as a sectioned triangular prism consists of sets of 2.6cmÃ-2.6cm iron square-section pipes formed with direction of the flow. In this research, a flow partitioning structure, FPS, designed, carried out, and installed downstream a sluice gate to apportion the cross sectional area of the flow and, then, increase the resistance of the friction force by increasing the walls of flow. One of the ways of moving the jump into a closer distance from the outlets is to raise the tail water level. The location of the jump downstream the hydraulic structures outlets is an important parameter taken into considerations within the construction of the downstream protection works. Hydraulic jump, Flow partitioning structure, Converging distance, Energy dissipation Abstract Water resources Engineering Dept., Faculty of Engineering, University of Kufa
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |