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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Active control of the wake behind the cylinder
 Broučková, Zuzana ; Flídr, Erik ; Šafařík, P. ; Trávníček, Zdeněk
Active control of the flow around a cylinder using synthetic jet (SJ) array was experimentally investigated. The prevailing method was flow visualization. Modification of the wake was investigated at two values of a dimensionless momentum coefficient (Cμ = 0.21 and 1.02). Various α and Cf parameters were tested (where α is the angle between SJs and the main flow direction and Cf is the frequency ratio). The control moves separation point more downstream. Increasing frequency ratio Cf causes refining of the vortex structure. When SJs are placed at the front or rear stagnation points, wake tends towards the symmetrical pattern.
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Small wind tunnel for flow field visualization
 Flídr, Erik ; Broučková, Zuzana ; Pavelka, Miroslav ; Trávníček, Zdeněk
This experimental work describes a small wind tunnel for flow field visualization and quantifies its main parameters. Velocity of fluid flow was evaluated by a few experimental methods: - Hot wire anemometry - Videorecord of flow - Velocity measurement at the outlet of the tunnel by hot wire anemometry - Velocity measurement at the outlet of the tunnel by Pitot tube - Continuous velocity measurement at the outlet of the tunnel using the reference Pitot tube Visualization of homogeneous flow field around a circular cylinder was shown.
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3 Flídr, E.
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