Power Properties of Two Interacting Wind Turbine Rotors

Valery Okulov, Robert Flemming Mikkelsen, Jens Nørkær Sørensen, Igor Naumov, Mikhail A. Tsoy

    Research output: Contribution to journalJournal articleResearchpeer-review


    In the current experiments, two identical wind turbine models were placed in uniform flow conditions in a water flume. The initial flow in the flume was subject to a very low turbulence level, limiting the influence of external disturbances on the development of the inherent wake instability. Both rotors are three-bladed and designed using blade element/lifting line (BE/LL) optimum theory at a tip-speed ratio, λ, of 5 with a constant design lift coefficient along the span, CL = 0.8. Measurements of the rotor characteristics were conducted by strain sensors installed in the rotor mounting. The resulting power capacity has been studied and analyzed at different rotor positions and a range of tip-speed ratios from 2 to 8, and a simple algebraic relationship between the velocity deficit in the wake of the front turbine and the power of the second turbine was found, when both rotors have the coaxial position.
    Original languageEnglish
    Article number051210-1
    JournalJournal of Energy Resources Technology
    Issue number5
    Number of pages6
    Publication statusPublished - 2017


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