Combined Experiment Phase 1. Final report

Butterfield, C.P.; Musiał, Wiesław; Simms, D.

doi:10.2172/10105837

Cited by 37 publications

(32 citation statements)

References 4 publications

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“…The Unsteady Aerodynamics Experiment HAWT is well documented [22][23][24]. The downwind turbine employs a three-bladed rotor that is 10.1 m in diameter and coned 3.4° downwind.…”

Section: Methodsmentioning

confidence: 99%

HAWT dynamic stall response asymmetries under yawed flow conditions

Schreck

Robinson

Hand

et al. 2000

2000 ASME Wind Energy Symposium

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“…The Unsteady Aerodynamics Experiment HAWT is well documented [22][23][24]. The downwind turbine employs a three-bladed rotor that is 10.1 m in diameter and coned 3.4° downwind.…”

Section: Methodsmentioning

confidence: 99%

HAWT dynamic stall response asymmetries under yawed flow conditions

Schreck

Robinson

Hand

et al. 2000

2000 ASME Wind Energy Symposium

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“…This machine was previously labeled and is commonly known as the Combined Experiment Rotor (CER) (Butterfield 1992). It was used for other purposes before, but it suited the current application because of its extensive instrumentation provisions.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

“…Minimal modifi cations were required to accommodate the current tests. The reader is referred to Butterfield (1992) for further information on the turbine, the test site, and the data-acquisition system. Discussions in the following sections will focus on those aspects that are particularly relevant to the investigation.…”

Section: Test Turbinementioning

confidence: 99%

Atmospheric tests of trailing-edge aerodynamic devices

Miller¹,

Huang

Quandt³

1998

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• • .: Printed on paper containing at least 50% wastepaper, including 20% postconsumer waste ForewordThe Wind Technology Division of the National Renewable Energy Laboratory (NREL) is conducting exploratory research on aerodynamic devices that are intended to enhance wind-turbine rotor performance and attenuate structural loads. Desired properties of these devices include simplicity, reliability, maintainability, low cost and fail-safe design. Initial efforts have focused on the use of trailing-edge aerodynamic brakes for overspeed protection. Long-term efforts will address more aggressive and innovative strategies that have the potential to significantly advance the state of the art.The first two research projects proceeded in parallel, with considerable interaction between the principal investigators:Subcontract No. TAD-3-13400 entitled "Wind Turbine Trailing-Edge Aerodynamic Brake Design" performed by Gene A. Quandt, and Subcontract No. XAD-3-133365 entitled "Aerodynamic Devices for Wind Turbine Performance Enhancement" performed by Wichita State University (WSU).The WSU Phase-1 Report discussed the configurations studied and the attempts to identify promising alternatives through the analysis of the wind tunnel test data. The Phase-2 Report presented wind tunnel results for "spoiler-flaps" of 30%, 40% and 50% chord; for various leading-edge lip extensions; for different venting arrangements; and for different device hinge locations. Gene Quandt's subcontract report, No. TP-441-7389, focused on aerodynamic and structural design, and included preliminary design calculations for a centrifugally-actuated aerodynamic brake.As is often the case with exploratory research, these projects spawned additional follow-on studies. Wind-tunnel tests were conducted at Ohio State University (OSU) in which a pressure-tapped S809 airfoil model was tested with three trailing-edge devices: the spoiler-flap, a plain flap ("unvented aileron") and a vented plain flap ("vented aileron"). In Subcontract No. XAX-5-15217-0 entitled "Investigation of Trailing-Edge Aerodynamic Brakes", rotating-blade tests of these same configurations were conducted at the National Wind Technology Center (NWTC) with the goal of quantifying the effects of unsteadiness, blade rotation and aspect ratio, so that corrections might be applied to wind-tunnel test data for use by wind-turbine designers in the future. The results of that effort are contained in the present report. PrefaceThe information presented in this report represents a great deal of work and time. It is the product of a team effort, in every sense of the phrase.Paul Migliore and many others at the National Renewable Energy Laboratory (NREL) National Wind Technology Center (NWTC) arranged for us to conduct the atmospheric tests. As far as the authors are aware, this investigation was the fi rst where non-NREL personnel conducted their experiments independently using a NWTC turbine. The exercise was valuable, enlightening, and pleasurable. Lee Fingersh and Dave Jager, in particular, provided ...

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“…The blade geometry and dimensions were extracted from the National Renewable Energy Laboratory (NREL) experiment setup [17,18,21,22], and some of these parameters are reported for completeness in Table 1 [21]. The blade pitch ratio is referenced to the 75% span location, see Fig.…”

Section: Main Characteristics Of the Nrel S809 Wind Turbinementioning

confidence: 99%

“…The resulting unsteady hub loads are finally achieved by a first space integration of the aeroelastic equations by applying the Galerkin approach -using as shape functions the bending and torsion free vibration eigenmodes of a uniform cantilever beam -and then in time using the harmonic balance approach [11,15,16]. Referring to the three-bladed wind turbine used for the experimental test at the National Renewable Energy Laboratory (NREL) [17,18] represented in Fig. 1, the goals of this paper are twofold: i) to develop an aerodynamic and aeroelastic tool for wind turbine design based on the fully-threedimensional Navier-Stokes equations, and ii) to highlight the differences and deficiencies of a two-dimensional versus a three-dimensional wind turbine aerodynamic modeling.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic and Aeroelastic Tool for Wind Turbine Applications

Viti¹,

Coppotelli²,

Pompeis³

et al. 2013

International Journal of Aeronautical and Space Sciences

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The present work focuses on the unsteady aerodynamics and aeroelastic properties of a small-medium sized wind-turbine blade operating under ideal conditions. A tapered/twisted blade representative of commercial blades used in an experiment setup at the National Renewable Energy Laboratory is considered. The aerodynamic loads are computed using Computational Fluid Dynamics (CFD) techniques. For this purpose, FLUENT ® , a commercial finite-volume code that solves the Navier-Stokes and the Reynolds-Averaged Navier-Stokes (RANS) equations, is used. Turbulence effects in the 2D simulations are modeled using the Wilcox k-w model for validation of the CFD approach. For the 3D aerodynamic simulations, in a first approximation, and considering that the intent is to present a methodology and workflow philosophy more than highly accurate turbulent simulations, the unsteady laminar Navier-Stokes equations were used to determine the unsteady loads acting on the blades. Five different blade pitch angles were considered and their aerodynamic performance compared. The structural dynamics of the flexible wind-turbine blade undergoing significant elastic displacements has been described by a nonlinear flap-lag-torsion slender-beam differential model. The aerodynamic quasi-steady forcing terms needed for the aeroelastic governing equations have been predicted through a strip-theory based on a simple 2D model, and the pertinent aerodynamic coefficients and the distribution over the blade span of the induced velocity derived using CFD. The resulting unsteady hub loads are achieved by a first space integration of the aeroelastic equations by applying the Galerkin's approach and by a time integration using a harmonic balance scheme. Comparison among two-and three-dimensional computations for the unsteady aerodynamic load, the flap, lag and torsional deflections, forces and moments are presented in the paper. Results, discussions and pertinent conclusions are outlined.

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Combined Experiment Phase 1. Final report

Cited by 37 publications

References 4 publications

HAWT dynamic stall response asymmetries under yawed flow conditions

HAWT dynamic stall response asymmetries under yawed flow conditions

Atmospheric tests of trailing-edge aerodynamic devices

Aerodynamic and Aeroelastic Tool for Wind Turbine Applications

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