Turbulence Control With Particle Image Velocimetry in a Backward-Facing Step

[+] Author and Article Information
Mika Piirto, Pentti Saarenrinne, Hannu Eloranta

Tampere University of Technology, Energy and Process Engineering, P.O. Box 589, 33101 Tampere, Finland

J. Fluids Eng 124(4), 1044-1052 (Dec 04, 2002) (9 pages) doi:10.1115/1.1516575 History: Received April 30, 2001; Revised May 31, 2002; Online December 04, 2002
Copyright © 2002 by ASME
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PIV-based turbulence control system
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Location of measurement window (gray area) in backward-facing step at x/h=1.5[[ellipsis]]4.5 from step change. Rotating rod is located 1h before the expansion.
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The mean streamwise inflow velocity profile at the location x/h=−2 together with the Spalding’s velocity profile for turbulent boundary layer
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Rotating axle in backward-facing step channel. The positive rotation of axle is forward, i.e., in the flow direction (a), and the negative against the flow direction (b). The axle can also be placed so as not to affect the flow (c).
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Streamwise rms velocity profiles upstream and downstream from the axle with positive and negative maximum speeds of DC motor
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Correlation curves for streamwise velocity in streamwise direction with different constant DC motor speeds (a) and their integral scales (b)
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Measured (MA filtered) and setpoint values for the integral scale (a) and the control output (b)
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Error of average values for streamwise (U) and spanwise (V) velocities in function of moving average filter length Mma
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Examples of MA velocity field (a), fluctuation field (b), and instantaneous Reynolds shear stress (c)
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Off-line test for absolute Reynolds shear stress. The samples are connected with lines.
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Measured (MA filtered) and setpoint values for Reynolds shear stress (a) and control output (b)
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Measured (MA filtered) and setpoint value (0.005) for Reynolds shear stress (a) and control output with two disturbances in flow speed at moments 9500 and 11150 s




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