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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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The design of a ducted wind turbine was optimized to maximize the power per total cross-sectional area of the device. The associated power coefficient was 0.69, which is significantly greater than that obtainable from an open rotor turbine. Furthermore, it was shown that there is an optimal duct length, which is 15 % of the rotor diameter.
Preprints
https://doi.org/10.5194/wes-2021-18
https://doi.org/10.5194/wes-2021-18

  15 Mar 2021

15 Mar 2021

Review status: this preprint is currently under review for the journal WES.

Maximal power per device area of a ducted turbine

Nojan Bagheri-Sadeghi, Brian T. Helenbrook, and Kenneth D. Visser Nojan Bagheri-Sadeghi et al.
  • Department of Mechanical & Aeronautical Engineering, Clarkson University, Potsdam, NY 13699-5725, United States

Abstract. The aerodynamic design of a ducted wind turbine for maximum total power coefficient was studied numerically using the axisymmetric Reynolds-averaged Navier-Stokes equations and an actuator disc model. The total power coefficient characterizes the rotor power per total device area, rather than the rotor area. This is a useful metric to compare the performance of a ducted wind turbine with an open rotor and can be an important design objective in certain applications. The design variables included the duct length, the rotor thrust coefficient, the angle of attack of the duct cross-section, the rotor gap, and the axial location of the rotor. The results indicated that there exists an upper limit for the total power coefficient of ducted wind turbines. Using an Eppler E423 airfoil as the duct cross-section, an optimal total power coefficient of 0.69 was achieved at a duct length of about 15 % of the rotor diameter. The optimal thrust coefficient was approximately 0.9, independent of the duct length and in agreement with the axial momentum analysis. Similarly independent of duct length, the optimal normal rotor gap was found to be approximately the duct boundary layer thickness at the rotor. The optimal axial position of the rotor was near the rear of the duct, but moved upstream with increasing duct length, while the optimal angle of attack of the duct cross-section decreased.

Nojan Bagheri-Sadeghi et al.

Status: open (until 30 Apr 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-18', David Wood, 10 Apr 2021 reply
  • RC2: 'Comment on wes-2021-18', Anonymous Referee #2, 11 Apr 2021 reply

Nojan Bagheri-Sadeghi et al.

Nojan Bagheri-Sadeghi et al.

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Short summary
The design of a ducted wind turbine was optimized to maximize the power per total cross-sectional area of the device. The associated power coefficient was 0.69, which is significantly greater than that obtainable from an open rotor turbine. Furthermore, it was shown that there is an optimal duct length, which is 15 % of the rotor diameter.
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