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Theoretical performance estimation of shrouded-twin-rotor wind turbines using the actuator disk theory

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  • Kumar, Vedant
  • Saha, Sandeep

Abstract

Wind energy is anticipated to play a vital role to fulfill the worldwide energy requirements, whereas existing bare wind turbines can convert only a fraction of flow energy into electricity. To bridge the gap between the escalating demand and the generation capability, we propose a shrouded-twin-rotor turbine design, whose power coefficient exceeds the Betz-Joukowsky limit. We analyze the flow through the wind turbine assembly, using the actuator disk theory, and estimate the power output for a pair of rotor-loading coefficients. We find the existence of two regimes in which the proposed design performs better than the single-rotor configuration: (a) a turbine-turbine mode where both rotors work as turbines and (b) a turbine-fan mode where one rotor is a turbine while the other is a fan- an idea proposed by Betz (A. Betz, Wind-Energie und ihre Ausnutzung durch Windmühlen, Vandenhoeck, 1926). Both modes enable achieving maximum power for multiple combinations of the loading coefficient pair. Moreover, power output depends solely on a single parameter, defined using the area weighted sum of the loading coefficients. We derive the optimum performance criterion and present the effects of the shroud geometry, back pressure, and flow-efficiency parameters on the power output and the performance envelope.

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  • Kumar, Vedant & Saha, Sandeep, 2019. "Theoretical performance estimation of shrouded-twin-rotor wind turbines using the actuator disk theory," Renewable Energy, Elsevier, vol. 134(C), pages 961-969.
    • Handle: RePEc:eee:renene:v:134:y:2019:i:c:p:961-969
    DOI: 10.1016/j.renene.2018.11.077
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    References listed on IDEAS

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    Cited by:

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