Wake Characteristics of a Model Wind Turbine and an Actuator Disk Model

摘要

Wake characteristics of a model wind turbine and a porous diskrnrespectively immersed in a uniform free stream and turbulent boundaryrnlayers were studied experimentally. Under the latter experimentalrncondition, two boundary layers of different thickness, about 5.5 and 1.5 D,rnrespectively, where D denotes the diameter of the model wind turbine, werernconsidered. Based on the hot-wire velocity measurements in the nearrnwake region, it is found that irrespective of the models the wake flowrndevelopment in the thicker boundary layer appear to be dominated by thernlarge scale eddies in the boundary layer, whereas in the thinner boundaryrnlayer, the wake flow development relies on the turbulent eddies generatedrnby the model, similar to the situation that the model is immersed in arnuniform free stream.