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- W2563030016 abstract "The uncertainty of an acoustic transit time (ATT) flow measurement can be estimated on the basis of computational fluid dynamics (CFD) simulations in advance of an installation. The paper illustrates an example of a flow simulation in the hydro power plant (HPP) Aratiatia, NZ, for heavily disturbed velocity distributions. In this power plant three turbines are fed from a common surge tank and are operated in parallel or individually. Details on the geometrical and numerical model are given, as well as the physical boundary conditions. The OWICS (Optimal Weighted Integration for Circular Sections) discharge integration method at Gauss-Jacobi positions is used to calculate the flow rates in the circular measuring sections immediately upstream of the spiral casing for different operating conditions. The procedures employed for extraction of the relevant data from the simulated flow fields needed for integration of the flow rates are described. A comparison of the axial and cross velocity components on the individual paths resulting from the CFD simulations and the measurement shows good agreement. From this agreement can be concluded that the shape of the disturbed velocity distributions as well the secondary flow is well predicted by the simulation. An analysis of the integrated path velocities show that the integration uncertainty remains below 1.3 % for the chosen 8 path, two plane configuration, even for the worst operating condition." @default.
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- W2563030016 date "2012-01-01" @default.
- W2563030016 modified "2023-09-23" @default.
- W2563030016 title "Comparison of measured path velocities with numerical simulations for heavily disturbed velocity distributions" @default.
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