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Measurements of velocity fields in a centrifugal fan by means of particle image velocimetry
(2018) Feldle, Christian; Pritz, Balazs; Walter, Johannes
"This thesis contains measurements of flow velocity fields inside the blade channel of a centrifugal fan by using Particle Image Velocimetry (PIV), an optical method for flow vis-ualization. The results are analyzed and compared to previous experiments. It concludes that they show a good compliance and quality. Beforehand, the fan’s characteristic curve and efficiency are determined and validated with preceding investigations. The results show a distinctive conformity with previous experi-ments and a good match with existing simulation data done by the Institute of Fluid Ma-chinery. The measurements are done at different speeds to proof the scalability. The power-train and the mounting for the camera and laser used for the experiments were modified to improve the quality of the data and to simplify the procedure of the PIV experiment. PIV measurements are measured at the points of maximum efficiency, partial load and full load, whose position on the characteristic curve were determined previously. The rotational speed is not varied in the PIV experiment, but in comparison to previous works, where only one fixed plane in the blade channel was measured, multiple planes are measured. This allows to visualize the flow in more depth and a profound knowledge about the flow con-ditions can be gathered."