3D-numerical optimisation of an asymmetric orifice in the surge tank of a high-head power plant

R. Gabl, S. Achleitner, J. Neuner, H. Götsch, M. Aufleger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this presented work, the results of 3D-numerical investigations will be utilized to improve the 1D-numerical calculation of water hammer and surge tanks of high-head power plants. Usually, tabular values are used to quantify local head losses as a first approach. For existing high head power plants, the coefficients can be calibrated based on measurements. In a planning stage, physical laboratory tests and 3D-numerical simulations provide an alternative to assess loss quantities. In case of the presented work, a 3D simulation using ANSYS-CFX is carried out to calculate the local head loss coefficients. Furthermore, the investigated orifice is optimised for stationary and non-stationary cases. The present investigations on an asymmetric orifice, which is located in an elbow and part of a restricted entry surge tank, have shown that the local loss coefficient for the numerical simulations is higher than the simplified theoretic approach (tabular value). The findings using a 3D numerical approach are in agreement with earlier laboratory experiments. Thus, the numerical method was applied to optimise the orifice geometry with respect to the asymmetric effects of the orifice and to minimise the construction costs.

Original languageEnglish
Title of host publication34th IAHR Congress 2011 - Balance and Uncertainty
Subtitle of host publicationWater in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering
PublisherInternational Association for Hydro-Environment Engineering and Research (IAHR)
Pages2428-2435
Number of pages8
ISBN (Electronic)9780858258686
Publication statusPublished - 1 Jan 2011
Event34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering - Brisbane, Australia
Duration: 26 Jun 20111 Jul 2011

Publication series

Name34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering

Conference

Conference34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering
Country/TerritoryAustralia
CityBrisbane
Period26/06/111/07/11

Keywords

  • 3D-numerical analysis
  • Asymmetric orifice
  • High-head power plant
  • Surge tank

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