Investigation of water head variation& relation to empirical Coefficient n of Stepped short Shaft Spill way

Subject Areas : hydraulic structures

roozbeh  AGHA MAJIDI ¹ (civil department, islamic azad university , sepidan branches, fars)
mohammad  nasre. isfahani ² (dam& hydroplower plant , ab& brgh authority of khuzestan)

Received: 2023-08-25 Accepted : 2023-12-01 Published : 2023-02-20

Keywords: Shaft Spillway, vortex blades, Submersible ratio, empirical hydraulic Coefficient,

Abstract :

These spillways (Stepped shaft spillways) pass more flow discharges through themselves in comparison to smooth spillways theoretically. Therefore knowing of flow behavior of these Spillways, help using better and more efficiently. Moreover, using vortex breaker has great effect on passing Flow through Shaft Spillway. For using more efficiently, the risk of flow water head on the crest decreases to less than fluid vapor water head on the crest , called cavitation’s, should be prevented as far as possible. At this research, it has been tried to study different behavior of Stepped chamber and different vortex breaker shapes on spillway flow. From the viewpoint of the effects of flow regime changes on spillway, changes of step dimensions, and the change of type of flow range will Studied Effectively. And finally the best the relation between water head on the crest and Discharge Coefficient are determined.