Improved Prediction of Aerodynamic Loss Propagation as Entropy Rise in Wind Turbines Using Multifidelity Analysis

Several physics-based enhancements are embedded in a low-fidelity general unducted rotor design analysis tool developed, py_BEM, including the local Reynolds number effect, rotational corrections to airfoil polar, stall delay model, high induction factor correction, polar at large angle of attack, exergetic efficiency calculation and momentum-based loss. A wind turbine is analyzed fidelity designed from py_BEM using 3D blade generator. It derived NREL Phase VI rotor. Three variations steady CFD solutions demonstrate effect geometry on aerodynamics. S809 NACA 2420 properties used for calculating aerodynamic loading. Momentum, vorticity energy transport explained depth connected entropy production as measure performance KE dissipation downstream shown be significant contributor rise. Wake demonstrates mixing with free stream flow, which begins after 3 diameters extends about 25 until decay very small. Vorticity dynamics investigated boundary flux technique relationship between streamwise lift generated layers. Drag components accounted well. demonstrated rothalpy that shaft power not only torque multiplied by velocity but viscous loss term must also included. multifidelity aerodynamics capturing flow physics several levels.