000022545 001__ 22545
000022545 005__ 20170724144654.0
000022545 04107 $$aeng
000022545 046__ $$k2017-07-04
000022545 100__ $$aSorribes-Palmer, Félix
000022545 24500 $$aAerodynamic design of a wind turbine diffuser with openfoam

000022545 24630 $$n7.$$p7th European and African Conference on Wind Engineering 
000022545 260__ $$bl'Association pour l'Ingénierie du Vent
000022545 506__ $$arestricted
000022545 520__ $$2eng$$aThe extractable energy of an horizontal-axis wind turbine rotor of fixed size can be increased by installing it inside of a diffuser. The diffuser helps to reduced the pressure behind the turbine compared to a bare turbine. The flow separation in the diffuser, also called diffuser stall, is one of the main problems concerning power extraction as it limits the area expansion. It depends mainly on the diffuser inlet conditions, exit conditions, Reynolds number, Mach number, and diffuser geometry. The aim of this work is to study the influence of wall functions and turbulence models used on the design of a diffuser augmented wind turbine (DAWT). A baseline configuration of maximum pressure loss at the actuator disk and area expansion, without flow detachment have been selected based on previous studies [14]. This 2D model with an expansion area µ = Aext /At = 3.7, included angle δ = 19.6o , pressure loss at the disk of k pc = 0.36 and at the diffuser k pd = 0.18 generates a pressure coefficient at the diffuser exit c pex = −0.75. Steady simulations have been performed using different incompressible turbulence models Launder-Sharma k − ε (LSke), Spalart–Allmaras (SA), k − ωSST (kwSST) and v2 − f (v2f). The geometry was generated with Salome, meshed with snappyHexMesh and the problem was numerically solved with OpenFOAM.

000022545 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022545 653__ $$aWind Turbine, Diffuser, OpenFOAM, Wall Functions, Turbulence Models

000022545 7112_ $$a7th European and African Conference on Wind Engineering$$cLiège, BE$$d2017-07-04 / 2017-07-07$$gEACWE2017
000022545 720__ $$aSorribes-Palmer, Félix$$iOgueta, Mikel$$iFranchini, Sebastián$$iSanz-Andres, Angel
000022545 8560_ $$ffischerc@itam.cas.cz
000022545 8564_ $$s1455801$$uhttps://invenio.itam.cas.cz/record/22545/files/73.pdf$$yOriginal version of the author's contribution in proceedings, id 73, section .
000022545 962__ $$r22493
000022545 980__ $$aPAPER