On the role of surface roughness in the aerodynamic performance and energy conversion of horizontal wind turbine blades: a review

Zidane, Iham F.; Saqr, Khalid M.; Swadener, J.G.; Ma, Xianghong; Shehadeh, Mohamed

doi:10.1002/er.3580

Cited by 50 publications

(32 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Wind 15 turbine operators report significant costs for inspection, maintenance, repair, and loss of production due to down time and reduced performance (Stephenson, 2011). LEE increases the surface roughness of blades and deteriorates the aerodynamic performance resulting in lower AEP during turbine operation (Zidane et al, 2016). The LEE issue has appeared as a consequence of the trend towards larger turbines with longer blades and higher nominal tip speeds (Keegan et al 2013, Macdonald et al, 2016.…”

Section: Introductionmentioning

confidence: 99%

Extending the life of wind turbine blade leading edges by reducing the tip speed during extreme precipitation events

Bech¹,

Hasager²,

Bak³

2018

Preprint

View full text Add to dashboard Cite

Abstract. Impact fatigue caused by collision with rain droplets, hail stones and other airborne particles, also known as rain erosion, is a severe problem for wind turbine blades. Each impact on the leading edge adds an increment to the accumulated damage in the material. After a number of impacts the leading edge material will crack. This paper presents and supports the hypothesis that the vast majority of the damage accumulated in the leading edge is imposed at extreme precipitation condition events, which occur during a very small fraction of the turbines operation life. By reducing the tip speed of the blades during 10 these events, the service life of the leading edges significantly increases from a few years to the full expected lifetime of the wind turbine. In the worst case at the cost of a negligible reduction of annual energy production (AEP) and in the best case with a significant increase in AEP.

show abstract

Section: Introductionmentioning

confidence: 99%

Extending the life of wind turbine blade leading edges by reducing the tip speed during extreme precipitation events

Bech¹,

Hasager²,

Bak³

2018

Preprint

View full text Add to dashboard Cite

show abstract

“…Several studies have quantified the impact of erosion and contamination on aerodynamic performance (Sareen et al, 2014;Zidane et al, 2016;Khalfallah and Koliub, 2007). The exact pattern and location of surface changes during operation is a random process, which is largely governed by local effects, such as the local relative speed of the flow with respect to the blade and the local manufacturing surface quality, for example in terms of gel coat thickness and bonding strength (Khalfallah and Koliub, 2007).…”

Section: Uncertainty In Rotor Aerodynamic Propertiesmentioning

confidence: 99%

Performance of non-intrusive uncertainty quantification in the aeroservoelastic simulation of wind turbines

Bortolotti¹,

Canét²,

Bottasso³

et al. 2019

Preprint

View full text Add to dashboard Cite

Abstract. The paper studies the effects of uncertainties on aeroservoelastic wind turbine models. Two non-intrusive uncertainty quantification methods are considered, namely non-intrusive polynomial chaos expansion and Kriging. Uncertainties are associated with the wind inflow characteristics and the blade surface state, on account of soiling and/or erosion, and propagated throughout the aeroservoelastic model of a large conceptual off-shore wind turbine. Results are compared with a brute-force extensive Monte Carlo sampling. Both methods appear to yield similar results, with a somewhat faster convergence for Kriging. The analysis of the solution space clearly indicates the effects of uncertainties and their couplings, and highlights some possible shortcomings of current mostly deterministic approaches.

show abstract

“…The changing of this outlook is coming from the various threats that fossil fuels could bring in in both local and international horizons including CO 2 emission in order to maintain a more sustainable and clean world. 1,2 The Australian and European markets show that the usage of more renewable energy sources such as wind and solar actually reduces the electricity price per kilowatt-hour. Similarly, a recent end of the year 2018 study in the United States suggests that the attractiveness of renewable energy sources now is because not only they are clean and renewable but also they have become a cheaper and less risk option to customers, [3][4][5] thus suggesting a brighter future for renewable energy.…”

Section: Introductionmentioning

confidence: 99%

Performance investigation of a small Savonius‐Darrius counter‐rotating vertical‐axis wind turbine

et al. 2019

View full text Add to dashboard Cite

This paper describes the study of a small vertical-axis wind turbine (VAWT) with a combined design of Darrius and Savonius counter-rotating rotors. The main purpose of this study is to improve the extraction capabilities of a single-rotor VAWT by using two distinct rotor designs while adopting the counter-rotating technique. Given that the conversion capabilities and operational speed of the existing wind turbines are still limited, the current technique is used to enhance the efficiency and expand the operating wind speed range of the VAWT. The Darrius and Savonius counter-rotating rotors were exposed to a similar upstream wind speed using a centrifugal blower. It was found that the Savonius-Darrius counter-rotating rotor was able to operate effectively, particularly at the low-speed wind. By looking at the individual performance of the rotors, it was observed that the conversion efficiency of the H-type rotor increases as the wind speed increases. However, in the case of the S-type rotor, it is higher at lower wind speed and tends to decrease as the operating speed increases. Thus, the maximum efficiency of the S-type rotor was achieved at low speed, whereas the H-type rotor has achieved its maximum efficiency at the highest operating wind speed. The average efficiency of the present Savonius-Darrius counter-rotating rotor has been improved to reach almost 42% and 30% more efficiency in terms of torque and power, respectively. Highlights • The effectiveness of combining S type and H type on a counter-rotating VAWT has been studied. • The new combined design was able to enhance the performance of the system significantly and was able to operate in a low-speed wind condition. • An average power coefficient and torque coefficient of up to 30% and 42% were, respectively, achieved using this technique.

show abstract

On the role of surface roughness in the aerodynamic performance and energy conversion of horizontal wind turbine blades: a review

Cited by 50 publications

References 34 publications

Extending the life of wind turbine blade leading edges by reducing the tip speed during extreme precipitation events

Extending the life of wind turbine blade leading edges by reducing the tip speed during extreme precipitation events

Performance of non-intrusive uncertainty quantification in the aeroservoelastic simulation of wind turbines

Performance investigation of a small Savonius‐Darrius counter‐rotating vertical‐axis wind turbine

Contact Info

Product

Resources

About