Effect of blade contamination on power production of wind turbines

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Özgen S., Sarıbel E. B., Yaman A. R.

JOURNAL OF PHYSICS: CONFERENCE SERIES, cilt.2265, ss.1-10, 2022 (Hakemli Dergi)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 2265
  • Basım Tarihi: 2022
  • Dergi Adı: JOURNAL OF PHYSICS: CONFERENCE SERIES
  • Derginin Tarandığı İndeksler: Aerospace Database, Compendex, INSPEC, zbMATH
  • Sayfa Sayıları: ss.1-10
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Wind turbines suffer from considerable power losses because of contamination on

their blades, that can be due to erosion, wear, smog, insect, sand and dust particle impact.

Blade contamination, its effects on the flows over the wind turbine blades and consequent

power production losses form the main focus of the present study. These effects are mainly

due to increased roughness on the blades leading to earlier laminar-turbulent transition and

consequently, thicker boundary-layers on the blades. Early laminar-turbulent transition leads

to a larger part of the flow over a blade being turbulent, thus increasing skin friction drag.

Thicker boundary-layer on a blade results in blade profile being effectively modified, rendering

the flow over the blade depart from ideal. In the present study, the effects of blade contamination

on power output of contaminated wind turbine blades is investigated numerically using an inhouse

computational tool. Blade Element Momentum Method (BEM) combined with the Panel

Method is used to calculate the local velocity and angle of attack at the blade sections, together

with the power produced by the blade. Trajectories of particles causing contamination are

calculated using Lagrangian approach, also yielding the impingement pattern of the particles

on the blade surface, i.e. particle collection efficiency distribution. The effects of roughness on

the boundary-layer flow are investigated by using an Integral Boundary-Layer Method, which

yields the characteristics of the boundary-layer, i.e. laminar-turbulent transition location,

increased skin-friction and thickening of the boundary-layer. The blade shape is modified

due contamination thickness, the local height of which is assumed to be proportional to the

local collection efficiency. Also, the roughness height distribution used in the boundary-layer

calculations is assumed to be equal to the contamination thickness distribution on the blades.

Power production and consequent losses of wind turbines with contaminated wind turbine blades

are studied with respect to variations in particle size, wind speed and roughness height.