Experimental study of dynamic inflow conditions of an actuator disc

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The main objective of this master’s thesis is to experimentally investigate the effects of dynamic inflow conditions on the wake of an actuator disc. Dynamic inflow is the unsteady wake in momentum theory. Dynamic inflow can experimentally be generated by a gust generator. During the experiments, in which Particle Image Velocimetry (PIV) was used as a flow measurement technique, the gust generator produced different gust frequencies and gust amplitudes. The oscillating gust results in the oscillating wake of the actuator disc. The oscillations of the wake cause wake expansion and compression. The expansion and compression of the wake is mainly dependent on the gust frequency. The higher the gust frequency is, the more oscillations the wake will see. So, the actuator disc’s wake was influenced by the gust.