Modèle hybride pour simuler l’écoulement à travers un birotor éolien caréné et sa validation expérimentale

Abstract : Doctoral dissertation summarizes the research on the functioning and flow around a two-stage, shrouded wind turbine. Placing the turbine at the inlet of a diverging channel allows to increase the mass flow rate of the flow through the rotor. To better take advantage of the increase in wind speed at the diffuser inlet, it was decided to examine the possibility of placing a second rotor in this area, with the opposite direction of rotation.The conducted study combined several different research paths, including Computational Fluid Dynamics (CFD) methods and experimental studies. This allowed for a more refined understanding of the nature of the flow and operation of a wind turbine with two rotors. Experimental research was carried out in the IMP TUL wind tunnel. A series of measurements of various turbine systems with and without shroud, with single- and double-rotor wind turbine were made. The collected results allowed to confirm that the shrouding can significantly (even twice) increase the efficiency of the rotor. However, aerodynamic forces and rotational speed also increase. This disadvantage can be partially addressed by using a second rotor and distributing aerodynamic loads to two turbine stages.An important part of the study were numerical simulations. They allowed to specify in more detail the nature and parameters of the flow and to estimate their impact on the performance of the wind turbine. Two different numerical models were developed:•Fully-resolved Rotor Model: URANS model in ANSYS CFX, based on discretising the entire geometry of the rotor, used for the flow analysis,•Hybrid model CFD-BET (Blade-Element Theory): RANS model in ANSYS Fluent, in which the rotor is represented by source terms in the Navier-Stokes equations, determined by an in-house code; the model was used to evaluate the performance of different wind turbine configurations.In the course of the research an in-house, empirical tip loss correction was proposed, taking into account the influence of the diffuser. The performed study permitted to observe, among others, that moving the rear rotor towards the outlet of the diffuser may result in a reduction of the wind speed through the front rotor, placed at the inlet to the diffuser, and a decrease in the overall system power.
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Michal Lipian. Modèle hybride pour simuler l’écoulement à travers un birotor éolien caréné et sa validation expérimentale. Génie des procédés. Ecole nationale supérieure d'arts et métiers - ENSAM; Institute of Turbomachinery, Lodz University of Technology, 2018. Français. ⟨NNT : 2018ENAM0073⟩. ⟨tel-02066158⟩

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