engleski

Vortex Drop Shaft on Hydro Power Plant Ombla

In order to satisfy the increased demand for electric power in the Republic of Croatia, the construction of hydro power plant (HPP) Ombla is being planned. The specific feature of the hydro-power plant design is that dam, storage reservoir, evacuation units and turbine hall are placed in the rock, that is below land surface. As a consequence of such plant disposition some technical solutions not typical in engineering practice have occurred. On the upstream side of the dam forming a storage reservoir is a collector on top of which a spillway with capacity of Q = 120 m3/s needed for evacuating high waters, is anticipated. From the collector water is spilling over the weir in the spillway ending with a vortex chamber. In order to conceive the flow of water for the adopted form and dimensions of particular spillway elements a hydraulic scale model was constructed. On the model, the water level on weir, velocity and depth in spillway and vortex chamber capacity was measured. Special attention was made on measurements in spillway and vortex chamber aimed at achieving even spiral introduction of water into vertical pit with the existence of air nucleus and satisfying the set condition of flow rate. In the paper, the laboratory studies of the spillway and the vortex chamber were described.

vortex drop shaft; hydraulic model; hydro power plant

Sažetak rada je na str. 53 objavljen u 'Book of abstracts' s navedenog skupa ; ISBN 978-953-6272-22-8.