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On the behaviour of periodic disturbances introduced into a turbulent channel flow by an oscillating airfoil

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Abstract

This paper is on the propagation characteristics of disturbances in turbulent shear flow. Periodic disturbances are introduced into a fully developed turbulent channel flow by an airfoil executing pitching oscillations. Hot-wire measurements are done on the mean and fluctuating velocities, on the Reynolds stresses and their spectra. The spectral data are evaluated to obtain the decay characteristics of the induced disturbance in this flow. The results show that the disturbance propagation in this flow is characterised by different decay rates in the regions near and far from the disturbance source.

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Abbreviations

h :

semi-height of the channel

X 1, x 2, x 3 :

cartesian coordinates in the streamwise crosswise and spanwise directions respectively; channel walls are situated at x 2 = 0 and 2 h

{ovu} 1 :

mean velocity in the streamwise direction

U max = U ref :

centre-line velocity of fully developed flow in the channel

u rw :

friction velocity

{ie275-01}:

velocity fluctuations long-time averaged Reynolds' normal and shear stresses

ω s , f s :

excitation frequency (ω s= 2πf s)

E u′ 1 u′1, E u′ 2 u′ 2,E u′ 1 u′ 2 :

spectra of Reynolds' stresses

α i :

decay rate, Eqs. (2) and (3)

G :

datum level

S :

disturbance

B :

basic flow, Eq. (4)

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Authors and Affiliations

  1. Institut für Thermo- und Fluiddynamik, Ruhr-Universität Bochum, D-4630, Bochum, Germany

    S. Kiske & V. I. Vasanta Ram

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  1. S. Kiske
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  2. V. I. Vasanta Ram
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Kiske, S., Vasanta Ram, V.I. On the behaviour of periodic disturbances introduced into a turbulent channel flow by an oscillating airfoil. Experiments in Fluids 7, 275–284 (1989). https://doi.org/10.1007/BF00198008

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