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Experimental Investigation of Flow over a RotatingDisk: Natural and Forced BoundaryLayer Flow Behavior And Characterization Of,Used
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This book is based on the experimental study of the rotatingdisk boundarylayer flow. In the case of the natural flow, different flow regimes are identified as a function of nondimensional distance, R, from the disk axis. Meanvelocity profiles initially follow the von Krmn solution. At higher R, departures arise and increase with R, which are due to the spatial growth of boundarylayer instability modes, whose radial growth rates are found to match lineartheory predictions. The profiles in the fully turbulent region follow the turbulent log law and the velocity spectra exhibit Kolmogorovtype power laws. To study the response to forcing, a setup has been designed which allows the excitation of stationary (in the lab frame) disturbances or disturbances which rotate with a frequency independently of the disk frequency. The flow response to both types of forcing and two forcing element geometries was studied. Stationary forcing produces a wake which decays with distance from the element, in agreement with theory. Forcing due to rotating elements can generate growing wavepacketlike disturbances, which although nonlinear, follow trajectories close to lineartheory predictions.
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