IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Hydraulic performance of a new isokinetic turbine for rivers and artificial channels
Hydraulic performance of a new isokinetic turbine for rivers and artificial channels
A new ducted isokinetic turbine for rivers and artificial channels has been designed. The new (patented) concept consists on an axial turbine with two joined concentric runners: an annular turbine runner and a central pump runner. The aim of the pump runner is to induce a suction effect in the central area in order to increase the axial velocity passing through the turbine runner and consequently the hydraulic efficiency.
In a first step, steady incompressible monophasic turbulent flow (k-ŠĆ model) numerical simulations have been used to optimize the hydraulic profile of a turbine with an expected mechanical power of 1 kW. A reduced computational domain including only a periodic quart of the turbine (at prototype scale) immerged in a water box has been considered. The Fine/Turbo package of the Numeca commercial code has been employed to solve the RANS equations using the finite volume method. Then, numerical simulations of unsteady incompressible homogeneous multiphase turbulent flow (using the SST model) have been performed on a computational domain including the full water passage of the final prototype, placed in a in a run-of-river tailrace canal with trapezoidal cross-section, to recover its hydraulic efficiency. The URANS equations have been solved with the Ansys CFX 14.5.7 commercial code using the finite volume method.
The main contribution of this work consists on a successful implementation of the numerical tools to optimize and to recover the hydraulic efficiency of a new isokinetic turbine with and without the free-surface effects taken into account. Moreover, the effect of the pump runner is assessed by comparing the obtained efficiency with performances of the isokinetic turbine featuring a free central open passage.
File Size : 2,675,506 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 19/08/2015
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