A2e - UAE6 - UAE6 - Sequence E - Raw Data


Atmosphere to Electrons (A2e) is a new, multi-year, multi-stakeholder U.S. Department of Energy (DOE) research and development initiative tasked with improving wind plant performance and mitigating risk and uncertainty to achieve substantial reduction in the cost of wind energy production.

The A2e strategic vision will enable a new generation of wind plant technology, in which smart wind plants are designed to achieve optimized performance stemming from more complete knowledge of the inflow wind resource and complex flow through the wind plant.

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Project: Unsteady Aerodynamics Experiment Phase VI NREL-NASA Ames Wind Tunnel Experiment

The Unsteady Aerodynamics Experiment (UAE) was undertaken to acquire research-grade wind turbine aerodynamics measurements capable of expanding physical comprehension, improving predictive models, and advancing turbine technology and performance. Initiated in 1987 at the National Renewable Energy Laboratory’s (NREL) National Wind Technology Center (NWTC), the UAE evolved through five phases of field experiments during 1987 through 1998.[1-3] Concurrently, analogous wind turbine field experiments aimed at the same objectives were pursued at several laboratories in Europe and Asia.[4,5] Together, these field experiments succeeded in developing procedures and instrumentation for acquiring research-grade measurements in the field test environment and generally confirmed that turbine blades produced flow fields that were highly three-dimensional, strongly separated, and predominantly unsteady.

However, crucial details of the turbine blade flow fields remained obscure, overwhelmed by the temporal and spatial disparities imposed by turbulent atmospheric inflows. To isolate the key blade and rotor fluid mechanics details, atmospheric inflow anomalies needed to be eliminated. Thus, plans were launched simultaneously in the United States and Europe to carry out research-grade turbine aerodynamics experiments in the largest U.S. and EU wind tunnels. Documented and archived in the DAP UAE6 database, the NREL UAE Phase VI experiment was conducted in the National Aeronautics and Space Administration (NASA) 80 ft x 120 ft wind tunnel at the NASA Ames Research Center at Moffett Field, California.[6] The EU Model rotor EXperiment In COntrolled conditions (MEXICO) experiment was carried out in the German-Dutch Wind Tunnels (DNW) Large Low Speed Facility (LLF), located near Marknesse in The Netherlands.[7]

The DAP UAE6 database contains the measurements acquired via experiments in the NASA Ames 80 ft x 120 ft during 2000. The UAE Phase VI wind tunnel experiment objectives were to: 1) acquire research grade aerodynamic and structural measurements 2) on a subscale wind turbine geometrically/dynamically similar to full scale, 3) operating in a controlled, low-turbulence inflow environment.

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Dataset Overview

Sequence E: Yaw Releases (P)

This test sequence used a downwind, rigid turbine with a 3.4° cone angle. The wind speeds ranged from 7 m/s to 17 m/s. Initial yaw angles of ±90° were achieved. The blade tip pitch was 3°. The rotor rotated at 72 RPM. Blade and probe pressure measurements were collected. The teeter dampers were replaced with rigid links, and these two channels were flagged as not applicable by setting the measured values in the data file to –99999.99 Nm. The teeter link load cell was pre-tensioned to 40,000 N. The turbine was positioned at each specified yaw angle. A 30- second data set was collected with the yaw brake engaged. These points used a letter for the last digit beginning with A and proceeding through the alphabet as repeat points were needed. These points were plotted and compared to ascertain the functionality of the instrumentation. The files ending in numbers beginning with 0 and increasing with each repetition represent yaw release points.

Once the fixed-position yaw test was complete, the yaw drive was engaged to hold the turbine. The yaw brake was released, and the yaw drive was disabled allowing the turbine to yaw freely. The yaw drive was disabled about 5 seconds into the campaign, and the turbine was allowed to yaw freely for the rest of the 30-second duration. When the yaw drive is disabled, no torque is applied to the motor, and the inertia and yawing force of the nacelle and rotor overcomes the friction and inertia of the yaw gear and motor. The yaw releases were repeated five times at each condition. Four additional campaigns were collected to determine the turbine’s natural yaw error by releasing the brake at 0° yaw error. These file names use the E designation, followed by two digits for wind speed, followed by XXXX, followed by the repetition digit.

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Data and Resources

Additional Info

Field Value
Source https://a2e.energy.gov/data/uae6/uae6.z04.00
Author Ken Burk
Maintainer Atmosphere to Electrons (A2e)
Bureau Code 019:20

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