On Vortex Formation in the Wake Flows of Transonic Turbine Blades and Oscillating Airfoils

[+] Author and Article Information
J. P. Gostelow

Department of Engineering, University of Leicester, University Road, Leicester LE1 7RH, UK

M. F. Platzer

 AeroHydro R&T Associates, 3070 Hermitage Road, Pebble Beach, CA 93953

W. E. Carscallen

Institute for Aerospace Research, National Research Council of Canada, Ottawa, ON K1A OR6, Canada

J. Turbomach 128(3), 528-535 (Feb 01, 2005) (8 pages) doi:10.1115/1.2184354 History: Received October 01, 2004; Revised February 01, 2005

This paper demonstrates similarities between the vortex shedding from blunt trailing-edge transonic turbine nozzle blades and from oscillating airfoils and bluff bodies. Under subsonic conditions the turbine nozzle cascade shed wake vortices in a conventional von Kármán vortex street. This was linked with a depressed base pressure and associated energy separation in the wake. Under transonic conditions a variety of different shedding configurations was observed with vortices shedding and pairing in several different ways. Similarities are addressed between the observed structures and those from vortex shedding in some other physical situations, such as the vortex wakes shed from cylinders and airfoils in sinusoidal heaving motion in low-speed flow. The established field of vortex-induced vibration has provided a developed classification scheme for the phenomena observed. The paper has brought together three previously independent fields of investigation and, by showing that the three are essentially related, has provided the basis for a new synthesis.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Map of vortex synchronization regions in the wavelength-amplitude plane (1)

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Figure 2

Sketches of the corresponding vortex-shedding patterns identified by Williamson and Roshko (1)

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Figure 3

Vortex patterns (2) for a NACA 0012 airfoil, oscillated in plunge, for a freestream velocity of ∼0.2m∕s and a frequency of 2.5Hz: (a) no oscillation, (b) kh=0.1 (c) kh=0.2, and (d) kh=0.4

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Figure 4

Sketches (2) of the wake of a plunging airfoil for various values of kh

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Figure 5

Numerical results of Young and Lai (16): (a) kh=0.1 and (b) kh=0.16

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Figure 6

Von Kármán vortex shedding at Ma=0.8

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Figure 7

Von Kármán vortex shedding at Ma=0.97

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Figure 8

Prediction of the instantaneous flow-field (density contours) downstream of a turbine blade (23)

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Figure 9

Von Kármán vortex shedding at Ma=1.07

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Figure 10

Shedding of couples at Ma=1.07

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Figure 11

Shedding of doublets at Ma=1.07




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