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Tikrit Journal of Engineering Sciences (2016) 23(3) 12- 24
Kinetic Energy Dissipation on Labyrinth Configuration Stepped Spillway
|Jaafar S. Maatooq|
|Building and Construction Dept., University of Technology, Iraq|
In present work a labyrinth (zigzag), in shape has been used to configure the steps of stepped spillway by using the physical model. This configuration does not introduce previously by investigators or in construction techniques of dams or cascades. It would be expected to improve the flow over chute. A magnifying the width path of each step to become, LT, instead of, W, will induce the interlocking between the mainstream and that spread laterally due to labyrinth path. This phenomenon leads to reduce the jet velocities near the surfaces, thus minimizing the ability of cavitation and with increasing a circulation regions the ability of air entrainment be maximized. The results were encouraging, (e.g., the reverse performance has recorded for spillway slope). From the evaluation of outcome, the average recorded of percentage profits of kinetic energy dissipation with a labyrinth shape compared with the results of traditional shape were ranged between (13- 44%). Different predictive formulas have been proposed based on iteration analysis, can be recommended for evaluation and design.
Keywords: Stepped spillway, Skimming flow, Overflow energy dissipation, Labyrinth weir, Air entrainment, Circulation regions