Print Email Facebook Twitter Time-resolved volumetric measurements of the interaction between energetic coherent motions and tip vortices in the wake of an axial-flow marine turbine Part of: PIV13; 10th International Symposium on Particle Image Velocimetry· list the conference papers Title Time-resolved volumetric measurements of the interaction between energetic coherent motions and tip vortices in the wake of an axial-flow marine turbine Author Troolin, D.R. Lee, S.J. Chamorro, L.P. Date 2013-07-03 Abstract Instantaneous and time-averaged volumetric velocity fields were obtained in the wake of a single, three-bladed hydrokinetic turbine model placed in a water flume at St. Anthony Falls Laboratory at the University of Minnesota, under subcritical conditions. A cylinder was placed upstream of the turbine in order to introduce large coherent motions into the incoming flow. Six unique configurations were tested, including a base flow characterization, the wake with the turbine-only, the wake of the turbine with a cylinder placed 5 diameters upstream, the wake of the turbine with a cylinder placed 8 diameters upstream, the wake of only the cylinder at the 5 diameters upstream position, and the wake of only the cylinder at the 8 diameters upstream position. The Q-criterion and vorticity as well as the volumetric velocity fields were used to study the interaction between energetic coherent motions generated by the cylinder and tip vortices generated by the turbine. Vortex shedding from the cylinder produced specific coherent vortical structures that affected the turbine wake by increasing the disorder of the otherwise relatively orderly helical downstream wake. Other relevant insights on the tip vortex dynamics, and flow characteristics in the turbine wake are discussed. To reference this document use: http://resolver.tudelft.nl/uuid:c75a7ed9-4561-454f-b231-6234cdd3b9ed Part of collection Conference proceedings Document type conference paper Rights (c) 2013 Troolin, D.R.; Lee, S.J.; Chamorro, L.P. Files PDF A045_Paper_PIV13_Troolin_ ... _Final.pdf 1.16 MB Close viewer /islandora/object/uuid:c75a7ed9-4561-454f-b231-6234cdd3b9ed/datastream/OBJ/view