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Proceedings Paper

Comparison of active flow control devices on bluff body shapes
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Paper Abstract

Results from experimental studies on the performance of plasma and synthetic jet actuators for active control of flow over a circular cylinder in subcritical flow conditions ranging from a Reynolds Number of 2.5 x 104 to 7.3x104 are presented. The experiments were conducted at the NASA Langley Research Center in the 20" x 28" Shear Flow Wind Tunnel and the results provide an indication of the effectiveness of, as well as the similarities and differences between these two active flow control (AFC) methods for reducing pressure drag on a bluff body shape. Flows over a cylinder are well understood and in particular flow separation characteristics for cylinders are well documented both experimentally and theoretically. The effect of the flow control devices is quantified by measuring the pressure distribution around the bluff bodies using a multi-port piezoelectric pressure scanner and integrating the distribution for drag analysis. This comparison consists of operating the two types of actuators in the same range of Reynolds Numbers (Re) over the cylinder and for the same actuator angular positions on the cylinder. The applied voltages and frequencies to the actuators varies based on the individual actuator operating conditions. At low Re, the plasma actuators have a strong effect on the pressure distribution reducing the drag up to 32% relative to the drag with no actuators on the surface. The synthetic jet reduces drag up to 25% but with lower voltage and frequency. For both actuator cases, the actuator is the most effective 5° to 10° upstream of the baseline separation point.

Paper Details

Date Published: 18 April 2007
PDF: 12 pages
Proc. SPIE 6523, Modeling, Signal Processing, and Control for Smart Structures 2007, 65230A (18 April 2007); doi: 10.1117/12.717008
Show Author Affiliations
Sarah J. Haack, Univ. of Maryland, College Park (United States)
Alison B. Flatau, Univ. of Maryland, College Park (United States)

Published in SPIE Proceedings Vol. 6523:
Modeling, Signal Processing, and Control for Smart Structures 2007
Douglas K. Lindner, Editor(s)

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