Accuracy analysis of a physical scale model using the example of an asymmetric orifice

Roman Gabl*, Stefan Achleitner, Johann Neuner, Markus Aufleger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

For a throttled surge tank of a high-head power plant in Austria the local head loss for an asymmetric orifice has to be quantified and optimized. The physical scale model tests (1:25) of nine different orifices are used as a validation experiment for 3D-numerical simulations (ANSYS-CFX). The increased requirements for the comparison of these two model assumptions lead to an extended accuracy analysis of the hydraulic model test. Based on Bernoulli[U+05F3]s equation, theoretical error terms are added to the measured variables (differential pressure and discharge) and thus the measurement accuracy of different instrumentations was tested. The verification of the scale test is based on long-term observation. These tests include the measurement of the vibration of the scale model and an investigation of the temporal offset between the different types of measurement instruments. The results are also examined with the help of a sensitivity analysis.

Original languageEnglish
Pages (from-to)36-46
Number of pages11
JournalFlow Measurement and Instrumentation
Volume36
DOIs
Publication statusPublished - 1 Apr 2014

Keywords

  • Design
  • Hydraulic model
  • Local head loss coefficient
  • Measurement accuracy
  • Orifice
  • Vibration

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