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in creator/contributor: "Larwood, S."

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Wind Turbine Wake Measurements in the Operating Region of a Tail Vain

In conjunction with the National Renewable Energy Laboratory's (NREL's) Unsteady Aerodynamics Experiment (UAE) at NASA Ames, we measured the wake of an upwind 10-meter (m) diameter wind turbine in the typical region of a tail vane. The experiment was performed in a 24.4-by-36.6-m wind tunnel. We placed two sonic anemometers 0.58 rotor diameters downwind of the rotor at hub height. One was positioned nominally behind the nacelle at 9% radius and the second was placed 2-m outboard at 49% radius. … more

Date: January 22, 2001

Creator: Larwood, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Comprehensive testing of Nedwind 12-Meter wind turbine blades at NREL

This paper describes the structural testing of two NedWind 25 12-m blades at the National Renewable Energy Laboratory (NREL). The tests were conducted under the Standards, Measurement and Testing (SMT) Program in conjunction with tests conducted by four European laboratories to develop a common database of blade testing methods. All of the laboratories tested duplicate copies of blades taken from series production. Blade properties, including weight, center of gravity, natural frequencies, stif… more

Date: March 13, 2000

Creator: Larwood, S. & Musial, W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Controlled Velocity Testing of an 8-kW Wind Turbine

This paper describes a case study of the controlled-velocity test of an 8-kW wind turbine. The turbine was developed in response to the U.S. Department of Energy's small wind turbine program. As background, the prototype development is discussed. The turbine mechanical and electrical components are described. The turbine was tested on a flatbed truck and driven down an airfield runway at constant relative wind speed. Horizontal furling was used to control over-speed. Various parameters were cha… more

Date: July 31, 2001

Creator: Larwood, S.; Sencenbaugh, J. & Acker, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

NREL Large-Scale Turbine Inflow and Response Experiment--Preliminary Results: Preprint

The accurate numerical dynamic simulation of new large-scale wind turbine designs operating over a wide range of inflow environments is critical because it is usually impractical to test prototypes in a variety of locations. Large turbines operate in a region of the atmospheric boundary layer that currently may not be adequately simulated by present turbulence codes. In this paper, we discuss the development and use of a 42-m (137-ft) planar array of five, high-resolution sonic anemometers upwi… more

Date: January 1, 2002

Creator: Kelley, N.; Hand, M.; Larwood, S. & McKenna, E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Dynamic characterization of the AWT-26 turbine for variable speed operation

The report describes an experiment to determine critical rotor speeds on the Advanced Wind Turbines, Inc., AWT-26/Prototype 3 for variable speed operation. The turbine was instrumented to measure accelerations and the data were reduced to determine areas of potential resonance. Critical rotor speeds were determined for incorporation into the variable speed control algorithm.

Date: July 1998

Creator: Larwood, S. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Measurement of Truck Cab Flow in Support of Wind Turbine Testing

This report describes an experiment to measure the airflow over a truck cab that can be used to conduct steady-state tests on an 8-kW wind turbine. The cab airflow measurements were made to document the turbine inflow for analytical models. The airflow measurements were made with an array of anemometers positioned to represent the turbine rotor disk. The data showed that the influence of the truck cab was primarily in the lower sector of the rotor disk. The influence was negligible in the rest … more

Date: December 17, 1998

Creator: Larwood, S. M. (National Renewable Energy Laboratory); Acker, B. & Sencenbaugh, J. (Windlite Corporation)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

NedWind 25 Blade Testing at NREL for the European Standards Measurement and Testing Program

In the mid-90s the European community initiated the Standards, Measurements, and Testing (SMT) program to harmonize testing and measurement procedures in several industries. Within the program, a project was carried out called the European Wind Turbine Testing Procedure Development. The second part of that project, called Blade Test Methods and Techniques, included the United States and was devised to help blade-testing laboratories harmonize their testing methods. This report provides the resu… more

Date: April 19, 2001

Creator: Larwood, S.; Musial, W.; Freebury, G. & Beattie, A. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Unsteady Aerodynamics Experiment Phase VI: Wind Tunnel Test Configurations and Available Data Campaigns

The primary objective of the insteady aerodynamics experiment was to provide information needed to quantify the full-scale, three-dimensional aerodynamic behavior of horizontal-axis wind turbines. This report is intended to familiarize the user with the entire scope of the wind tunnel test and to support the use of the resulting data.

Date: December 1, 2001

Creator: Hand, M. M.; Simms, D. A.; Fingersh, L. J.; Jager, D. W.; Cotrell, J. R.; Schreck, S. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department