Application of a viscous flow methodology to the NREL Phase VI rotor

Xu, Guanpeng; Sankar, Lakshmi N.

doi:10.2514/6.2002-30

Cited by 17 publications

(10 citation statements)

References 14 publications

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“…A value of the exponent n between 0.8 and 1.6 gives a good correlation with most data (19,27,28) . In previous work (28,46) , n = 1 was used as the value of the exponent, and this is continued in this paper. In addition to the delay of stall, the lift coefficient is increased according to…”

Section: June 2017 the Aeronautical Journalmentioning

confidence: 99%

Blade element momentum theory extended to model low Reynolds number propeller performance

MacNeill

Verstraete

2017

Aeronaut. j.

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Propellers are the predominant propulsion source for small unmanned aerial vehicles. At low advance ratios, large sections of the propeller blade can be stalled, and the Reynolds number faced by each blade can be low. This leads to difficulties in modelling propeller performance, as the aerodynamic models coupled with blade element methods usually only provide aerodynamic data for an assumed aerofoil section, for a small angle-of-attack range and for a single Reynolds number, while rotational effects are often ignored. This is specifically important at low advance ratios, and a consistent evaluation of the applicability of various methods to improve aerodynamic modelling is not available. To provide a systematic appraisal, three-dimensional (3D) scanning is used to obtain the aerofoil sections that make up a propeller blade. An aerodynamic database is formed using each extracted aerofoil section, across a wide range of angles of attack and Reynolds numbers. These databases are then modified to include the effects of rotation. When compared with experimental results, significant improvement in modelling accuracy is shown at low advance ratios relative to a generic blade element-momentum model, particularly for smaller propellers. Notably, when considering small propeller performance, efficiency modelling is improved from within 30% relative to experimental data to within 5% with the use of the extended blade element momentum theory method. The results show that combining Viterna and Corrigan flat plate theory with the Corrigan and Schillings stall delay model consistently yields the closest match with experimental data.

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Section: June 2017 the Aeronautical Journalmentioning

confidence: 99%

Blade element momentum theory extended to model low Reynolds number propeller performance

MacNeill

Verstraete

2017

Aeronaut. j.

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“…In addition to the Prandtl model, users of AeroDyn also have the option of using an empirical relationship for the tip loss based on the Navier-Stokes solutions of Xu and Sankar (2002) as described in the following equations:…”

Section: Tip-loss Modelmentioning

confidence: 99%

AeroDyn Theory Manual

Moriarty¹,

Hansen²

2005

520

401

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AeroDyn is a set of routines used in conjunction with an aeroelastic simulation code to predict the aerodynamics of horizontal axis wind turbines. These subroutines provide several different models whose theoretical bases are described in this manual. AeroDyn contains two models for calculating the effect of wind turbine wakes: the blade element momentum theory and the generalized dynamic-wake theory. Blade element momentum theory is the classical standard used by many wind turbine designers and generalized dynamic wake theory is a more recent model useful for modeling skewed and unsteady wake dynamics. When using the blade element momentum theory, various corrections are available for the user, such as incorporating the aerodynamic effects of tip losses, hub losses, and skewed wakes. With the generalized dynamic wake, all of these effects are automatically included. Both of these methods are used to calculate the axial induced velocities from the wake in the rotor plane. The user also has the option of calculating the rotational induced velocity. In addition, AeroDyn contains an important model for dynamic stall based on the semi-empirical Beddoes-Leishman model. This model is particularly important for yawed wind turbines. Another aerodynamic model in AeroDyn is a tower shadow model based on potential flow around a cylinder and an expanding wake. Finally, AeroDyn has the ability to read several different formats of wind input, including single-point hub-height wind files or multiple-point turbulent winds.

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“…Besides aeroelastic codes, NREL also designed the "NREL phase I-VI turbine". Both simulation and wind tunnel tests were conducted to investigate the 3dimensional and unsteady aerodynamic [28][29][30]. In 1995, the new "NREL airfoil family for horizontal-axis wind turbines (HAWTs)" was presented [31], and all NREL phase II-VI turbines were based on the new S809 airfoil.…”

Section: Aeroelastic Research In Usmentioning

confidence: 99%

Review of aeroelasticity for wind turbine: Current status, research focus and future perspectives

Zhang

Huang

2011

Front. Energy

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Aeroelasticity has become a critical issue for Multi-Megawatt wind turbine due to the longer and more flexible blade. In this paper, the development of aeroelasticity and aeroelastic codes for wind turbine is reviewed and the aeroelastic models for wind turbine blade are described, based on which, the current research focuses for large scale wind turbine are discussed, including instability problems for onshore and offshore wind turbines, effects of complex inflow, nonlinear effects of large blade deflection, smart structure technologies, and aerohydroelasticity. Finally, the future development of aeroelastic code for large scale wind turbine: aeroservoelasticity and smart rotor control; nonlinear aeroelasticity due to large blade deflection; full-scale 3D computational fluid dynamics (CFD) solution for dynamics; and aerohydroelasticity are presented.

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Application of a viscous flow methodology to the NREL Phase VI rotor

Cited by 17 publications

References 14 publications

Blade element momentum theory extended to model low Reynolds number propeller performance

Blade element momentum theory extended to model low Reynolds number propeller performance

AeroDyn Theory Manual

Review of aeroelasticity for wind turbine: Current status, research focus and future perspectives

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