PIV investigation on airfoil with ice accretions and resulting performance degradation

Gregorio, F. De; Ragni, A.; Airoldi, M.; Romano, G. P.

doi:10.1109/iciasf.2001.960239

Cited by 5 publications

(8 citation statements)

References 7 publications

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“…Figure 4 shows that the type C contamination reduces α stall by 5°. This agrees with results reported by DeGregorio et al, 15 who used a NACA0012 airfoil with comparable contamination geometries. Hann et al 20 also found that the lift, for α just below stall, decreased by 10% while drag increased from

C_{d} = 0.016

C_{d} = 0.049

α = 0^{\circ}

for type C contamination.…”

Section: Resultssupporting

confidence: 92%

“…[12][13][14] Several experiments have been performed to measure the forces acting on an airfoil subjected to icing. 10,[15][16][17][18][19][20] The pressure distribution of the flow has also been evaluated for various icing geometries. 18,20,21 Increased drag and reduced lift are observed in most studies.…”

mentioning

confidence: 99%

“…The geometry of the contaminations agrees qualitatively well with ice geometries found in the literature. 6,8,15 However, ice feathers or rivulets located downstream of the leading edge are not present in the geometries used in the present study. The type C contamination geometry is horn-like.…”

mentioning

confidence: 99%

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Aerodynamics of an airfoil with leading‐edge icing

Vinnes

Hearst

2020

Wind Energy

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The flow over the leading edge of an NREL S826 reference airfoil with three different icing-inspired leading-edge contamination geometries has been assessed experimentally. Particle image velocimetry was performed on the leading edge of the airfoil for a range of angles-of-attack between −4 and 16 . This work primarily focuses on the flow physics at Reynolds numbers (Re c = 455 000) within the Reynolds number independent regime of the airfoil. The present work illuminates our understanding of the flow phenomena as well as provides a validation dataset for future numerical work. From the acquired data, the mean velocity, turbulent kinetic energy and mean vorticity have been estimated. The results show how the different contamination geometries affect the point of separation. It is also shown that the intermittency of the flow behind horn-shaped contamination is dependent on the angle-of-attack, even at angles above stall. Proper orthogonal decomposition was performed on the velocity fields to identify whether reduced order modelling is an appropriate tool for rapid estimation of these flows. It was found that a limited number of modes carried a large fraction of the fluctuating energy, demonstrating that reduced order modelling is feasible.

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C_{d} = 0.016

C_{d} = 0.049

α = 0^{\circ}

for type C contamination.…”

Section: Resultssupporting

confidence: 92%

mentioning

confidence: 99%

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Aerodynamics of an airfoil with leading‐edge icing

Vinnes

Hearst

2020

Wind Energy

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“…6 (d), there is no obvious bulge on the chord-wise temperature distribution, and it owns the largest 'peak' value among the cases under the same temperature, even larger than the case with a higher LWC ascribed to the intensive ice building around the LE. Similar findings 18,20,28,29 about the more severe effects of mixed ice than both glaze and rime ice have been presented. In Fig.…”

Section: B Temperature Variation Analysissupporting

confidence: 82%

“…These studies provide variously practicable contributions to the wind turbine icing issue. However, literatures of more fundamental icing physics are mostly related to aircraft icing [20][21][22] . Few of them are in the wind turbine field.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Icing Physics for Wind Turbine Icing Mitigation

Guo

Zhang

Waldman

et al. 2017

35th Wind Energy Symposium

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An experimental study was conducted to investigate the dynamic ice accretion process over the surface of a wind turbine blade with DU96-W-180 airfoil profile in order to elucidate the underlying physics for wind turbine icing mitigation. The experimental study was conducted in the Icing Research Tunnel of Iowa State University (ISU-IRT). Six test cases with three typical liquid water content (LWC) levels (i.e., LWC =0.3 g/m 3 , 1.1 g/m 3 , and 3.0 g/m 3) and two typical oncoming airflow temperatures (i.e., T ∞ =-5 o C, and-10 o C) were selected to represent rime icing, mixed icing and glaze icing conditions that wind turbines may experience in winter. In addition to using a high-speed imaging system to quantify the transient behavior of surface water runback and dynamic ice accretion processes over the airfoil surface, an infrared (IR) thermal imaging system was also utilized to simultaneously measure the airfoil surface temperature distributions in the course of the ice accreting process. The measurement results reveal clearly that, both the length of the surface water/ice film formed near the airfoil leading edge and the subsequent water/ice rivulet length would increase as the liquid water content level and the temperature of the oncoming airflow increase. The thickness of the ice accreted at the airfoil leading edge was found to grow rapidly with the increasing liquid water content level and decreasing oncoming airflow temperature for both glaze and mixed icing test cases. The temperature distribution over the airfoil surface was also found to vary significantly, depending on the type of ice accreted over the airfoil surface. A stream-wise 'plateau' region was observed in the measured surface temperature distributions for the glaze and mixed icing cases, due to the formation of surface water runback over the ice accreting airfoil surface.

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Impact and mitigation of blade surface roughness effects on wind turbine performance

2021

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This paper presents a numerical study of the effects of blade roughness on wind turbine performance and annual energy production and how these effects may be partially mitigated through improved control. Three rotors are designed using the NACA4415, S801 and S810 airfoils, and blade element momentum theory is used to model wind turbine behaviour. The aerodynamic lift and drag data for the clean and roughened airfoils are taken from previous experimental work. These show that surface roughness leads to a decreased airfoil lift coefficient and an increased drag coefficient across an angle of attack range typical for large wind turbines, which will clearly lead to decreased turbine performance. Three separate control methods are considered for wind turbines with roughened blades operating at each of four candidate wind sites with different wind speed distributions. Results show that, compared to clean rotor blades, the roughened blades lead to a performance drop in the range of 2.9–8.6% for a torque based control strategy. A control‐based performance recovery strategy, in which the controller gain coefficient is re‐optimised, increased roughened rotor annual energy production by 0.1–1.0%.

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PIV investigation on airfoil with ice accretions and resulting performance degradation

Cited by 5 publications

References 7 publications

Aerodynamics of an airfoil with leading‐edge icing

Aerodynamics of an airfoil with leading‐edge icing

An Experimental Study on Icing Physics for Wind Turbine Icing Mitigation

Impact and mitigation of blade surface roughness effects on wind turbine performance

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