engleski

Investigation of Numerical Simulation Parameters on Fluid Flow Around Trash-Racks

Trash-racks provide protection for hydraulic turbines by blocking entrance of large debris that could damage turbine parts. Trash-racks also help reduce fish injuries and mortality caused with fish entrapment in turbine. Installation of trash-racks is necessary, but causes inevitable head losses that decrease water turbine energy production. With increasing ecological concerns different bar-rack configurations are examined to provide better fish protection, mostly not considering head losses. Experimental results of head losses caused by trash-racks found in literature are conducted on scaled models due to experiment facility limitations while number of investigated configurations is limited with cost of production. Most head loss equations derived from experimental results are valid only in specific range of parameters. Considering these limitations, numerical simulations would enable investigation of a large number of trash-rack combinations, where simulations can be conducted for turbine intake geometries made in full scale. In this work numerical simulation results will be compared with experimental results from literature. Geometry, mesh and simulation parameters will be investigated, considering influence on simulation results agreement with experiment. Guidelines for numerical simulation setup will be provided for future work where investigation of trash-rack configurations that are not yet covered in literature can be conducted.

trash-rack ; CFD ; turbulent models ; head loss

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