In-Situ Blade Strain Measurements of a Crossflow Turbine Operating in a Tidal Flow

Dataset · Fri Dec 16 04:00:00 EST 2022

DOI:https://doi.org/10.15473/2481243· OSTI ID:2481243

Bharath, Aidan ^[1]; Bichanich, Mason; O'Byrne, Patrick; Monahan, Michael; Wosnik, Martin; Nichols, Casey; Raye, Robert; Simms, Andrew; Candon, Charles; Ross, Hannah; Hunt, Jon; Murphy, Mark

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1. National Renewable Energy Laboratory

This data was collected between October 25 and December 12 of 2022 at the University of New Hampshire (UNH) and Atlantic Marine Energy Center (AMEC) turbine deployment platform (TDP). The goal was to collect blade strain data from a crossflow turbine operating in a tidal flow. A table in ('Deployment Schedule.PNG') outlines the various dates when each instrument was operational, and more details can be found via literature listed in 'Related Publications'.txt. This dataset includes zipped folders for each instrument containing data in .csv files for the relevant duration specific to each instrument, along with separate README file for each measurement. Some instrument files are quite large and can pose a challenge for a visual spreadsheet editor to open. A processing software like MATLAB or Python is recommended. All data contained in this submission is unfiltered/unprocessed data unless otherwise noted in the README file. Blade strain was measured using 8 foil-based strain gauges along the span of a single turbine blade. Water currents were measured using Acoustic Doppler Current Profilers (ADCP's) and Acoustic Doppler Velocimeters (ADV's) both upstream and downstream of the turbine for inflow, wake and turbulence measurements. Electrical power output was measured using the Voltsys rectifier. Shaft speed was calculated based on the Voltsys measurements of the permanent magnet three phase generator AC generation frequency, coupled directly to the cross flow turbine under test (i.e., no gear box). Platform motions were captured using a Yost IMU (inertial measurement unit). Turbine thrust loading was measured using a reaction arm about the turbine deployment platform spanning beam, where two bi-directional load cells were connected to the system via a pinned connection. The TDP is a floating structure moored on the Portsmouth facing side of Memorial Bridge pier #2, which spans the Piscataqua River between Portsmouth, NH and Kittery, ME. The Piscataqua River connects the Great Bay Estuary to the Gulf of Maine and the river currents are dominated by tidal flow with water velocities exceeding 2.5 m/s during spring ebb tides at this site which were previously characterized by Chancey 2019. The turbine under test was a modified New Energy Corporation (Calgary, CA) model EVG-025 4-blade H-Darrius type vertical axis cross flow turbine that rotates in the clockwise direction with a rotor diameter of 3.2m and blade length of 1.7m. The hydro-foil profile was a NACA 0021 with a 10 inch chord length and a blade preset pitch angle of +4deg with a positive angle corresponding with the toe in direction. The standard EVG-025 has a rotor diameter of 3.4m and its rated power output is 25kW at 3 m/s. The rotor diameter was reduced to accommodate the size of the existing TDP moon-pool. A single blade of this turbine was further modified to accommodate 8 full-bridge strain gauges (Bharath et al 2023, Bichanich et al 2024). For power performance and other relevant details on the turbine and its characteristics, see O'Byrne 2022.

• Research Organization: Marine and Hydrokinetic Data Repository (MHKDR); National Renewable Energy Laboratory
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office (EE-4WP)
• Contributing Organization: National Renewable Energy Laboratory
• OSTI ID: 2481243
• Report Number(s): 569
• Availability: [e-mail]
• Country of Publication: United States
• Language: English

Related Subjects

16 TIDAL AND WAVE POWER
ADCP
ADV
Excel
Hydrokinetic
MATLAB
MHK
Marine
New Hampshire
Piscataqua River
Portsmouth
Python
TDP
acoustic doppler current profiler
acoustic doppler velocimeter
blade strain
crossflow
crossflow turbine
energy
field data
power
power output
power performance
processed data
raw data
strain
thrust
tidal flow
tidal turbine
turbine deployment platform