Catalog of low-Reynolds-number airfoil data for wind-turbine applications

Miley, S. J.

doi:10.2172/5044823

Cited by 92 publications

(53 citation statements)

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“…The lift coefficient for a symmetrical airfoil is zero at an angle of attack of zero and increases to (Miley, 1982); Re, Reynolds number over 1.0 before decreasing at higher angles of attack. The lift coefficient for a symmetrical airfoil is zero at an angle of attack of zero and increases to (Miley, 1982); Re, Reynolds number over 1.0 before decreasing at higher angles of attack.…”

Section: Stream Linesmentioning

confidence: 98%

“…There are many types of airfoils (see Abbott and von Doenhoff, 1959;Althaus and Wortmann, 1981;Althaus, 1996;Miley, 1982;Tangler, 1987). A few examples of ones that have been used in wind turbine designs are shown in Figure 3.8.…”

Section: Airfoil Terminologymentioning

confidence: 99%

“…Pressure increasing Velocity decreasing Figure 3.10 Effects of favorable (decreasing) and adverse (increasing) pressure gradients on the boundary layer (Miley, 1982) It is important to distinguish the effects of the turbulence in the atmosphere from that in the boundary layer of the airfoil. Wind turbine airfoils operate in the turbulent planetary boundary layer but the scale of the turbulent fluctuations in the atmosphere is much larger than the scale of the turbulence in the boundary layer of a wind turbine airfoil.…”

Section: Pressure Decreasing Velocity Increasingmentioning

confidence: 99%

“…The lift coefficient at low angles of attack can be increased and drag can often be decreased by using a cambered airfoil (Eggleston and Stoddard, 1987;Miley, 1982). For example, the DU-93-W-210 airfoil is used in some European wind turbines.…”

Section: Stream Linesmentioning

confidence: 99%

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Aerodynamics of Wind Turbines

Manwell

McGowan

Rogers

2009

Wind Energy Explained

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The study of rotor blade aerodynamic performances of wind turbine has been presented in this thesis. This study was focused on aerodynamic effects changed by blade surface distribution as well as grid solution along the airfoil. The details of numerical calculation from Fluent were described to help predict accurate blade performance for comparison and discussion with available data.The direct surface curvature distribution blade design method for two-dimensional airfoil sections for wind turbine rotors have been discussed with the attentions to Euler equation, velocity diagram and the factors which affect wind turbine performance and applied to design a blade geometry close to an existing wind turbine blade, Eppler387, in order to argue that the blade surface drawn by direct surface curvature distribution blade design method contributes aerodynamic efficiency.The FLUENT calculation of NACA63-215V showed that the aerodynamic characteristics agreed well with the available experimental data at lower angles of attack although it was discontinuities in the surface curvature distributions between 0.7 and 0.8 in x/c. The discontinuities were so small that the blade performance could not be affected.The design of Eppler 387 blade performed to reduce drag force. The discontinuities of surface distribution matched the curve of the pressure coefficients. It was found in the curvature distribution that the leading edge pressure side had difficulties to connect to Bezier curve and also the trailing edge circle was never be tangent to the lines of trailing edge pressure and suction sides due to programming difficulties.

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Section: Stream Linesmentioning

confidence: 98%

Section: Airfoil Terminologymentioning

confidence: 99%

Section: Pressure Decreasing Velocity Increasingmentioning

confidence: 99%

Section: Stream Linesmentioning

confidence: 99%

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Aerodynamics of Wind Turbines

Manwell

McGowan

Rogers

2009

Wind Energy Explained

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“…(The Reynolds number effects on the lift and drag coefficients are innumerable and would require a significant treatise well beyond the scope of this report. For a concise tutorial on the subject the reader is referred to the recent work of Miley (1982).) Also accounted for in the power curve are terms like rotor efficiency, which includes the above Reynolds number information, and gearbox efficiency or losses, and the generator losses.…”

Section: Model Verificationmentioning

confidence: 99%

Development and verification of MOD-2 and MOD-0A simulation models. [Program listings of MOD2SIM and MOD0ASIM]

Miller¹,

Formica²

1984

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EXECUTIVE SUMMARYThis report summarizes the development, testing and verification of quasidynamic or operating strategy computer models of the MOD-OA and the MOD-2 wind turbines. These models simulate the specific turbines• operations based on their individual operating strategies and power curves and predict power output.For large-scale wind turbines to be taken seriously, their Cost of Energy (COE) is very important. In the computation of COE, the numerator is composed of the expenses involved in the acquisition and operation of the source. The denominator is the annual energy production or, in the case of a wind turbine, the energy capture. Calculation of an estimated energy capture by a given wind turbine at a specific site uses a •static• approach: typically either hourly wind speed averages over the period of a year or the Probability Distribution Function (PDF) of those winds, a wind-to-power transfer function, and possibly a little heuristic reasoning to account for the losses due to normal operational constraints. In this report, comparisons of this static approach and the operating strategy model approach generally show significant disparities. The magnitude of the disparity appears to be site-specific and is a function of the wind speed and direction variance rather than the annual mean speed or the site PDF.

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