Measuring Inflow and Wake Flow Turbulence Using a Mobile-Deployed Acoustic Doppler Velocimeter

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Measuring Inflow and Wake Flow Turbulence Using a Mobile-Deployed Acoustic Doppler Velocimeter

By | 2016-12-02T18:48:26+00:00 September 23rd, 2014|Computational Modeling & Simulation, Energy, News, News & Events, Renewable Energy, Systems Analysis, Water Power|Comments Off on Measuring Inflow and Wake Flow Turbulence Using a Mobile-Deployed Acoustic Doppler Velocimeter

Sandia has developed a mobile acoustic Doppler velocimeter (ADV) system that characterizes inflow and wake flow velocity and turbulence around a vertical axis turbine deployed at the Roza Canal, Yakima, Washington. The ADV was mounted on a hydrofoil (see figure, left-hand panel) and deployed using either an aluminum platform mounted on a bridge (center panel) or using a cableway system (right-hand panel).

The acoustic Doppler velocimeter (ADV) probe, mounted on a hydrofoil (left). The ADV measures inflow velocity immediately upstream of the turbine (center). A cableways system used for deploying the ADV at different points along the canal cross-section (right).

The acoustic Doppler velocimeter (ADV) probe, mounted on a hydrofoil (left). The ADV measures inflow velocity immediately upstream of the turbine (center). A cableways system used for deploying the ADV at different points along the canal cross-section (right).

The Sandia team tested the system during a June 2014 site visit. The ADV has a 64 Hz sampling frequency and could be used to study the complex interaction between flow turbulence, turbine-generated power, and turbine wake dynamics. Spectral analyses on the flow turbulence and power generation data are being used to investigate the effect flow turbulence has on power generation. The measurements will also be used for validating numerical tools, such as the Sandia’s Environmental Fluid Dynamics Code (SNL-EFDC) model.

The Sandia team will make additional site visits to conduct more measurements with different turbine operation scenarios.