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TECHNICAL PAPERS

Comparison of Different Acceleration Techniques and Methods for Periodic Boundary Treatment in Unsteady Turbine Stage Flow Simulations

[+] Author and Article Information
Martin von Hoyningen-Huene, Alexander R. Jung

Siemens Power Generation (KWU), Gas Turbine Development, D-45466 Mülheim an der Ruhr, Germany

J. Turbomach 122(2), 234-246 (Feb 01, 1999) (13 pages) doi:10.1115/1.555440 History: Received February 01, 1999
Copyright © 2000 by ASME
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References

Figures

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Computational grid at midspan
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Contour lines at eight equidistant instants in time; point of reference: t=0 at top left corner
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Time-averaged static pressure distribution over the rotor (explicit calculation)
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Instantaneous static pressure deviations (p−p̄) on the rotor blade at t=1/8T
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Rotor blade pressure amplitude and phase at midspan as a function of the axial chord
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Pressure amplitude and phase angle of the first harmonic on the stator as a function of the axial chord
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Unsteady pressure fluctuations at one node downstream of the stator blade trailing edge (top) and one node downstream of the rotor trailing edge (bottom) during two blade passing periods. The height of each plot is chosen to correspond to 0.02.
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Entropy distribution in the rotor along a grid line in pitchwise direction (near the interface)
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Phase angle of the first and second entropy harmonic along a gridline in the pitchwise direction (near the interface), legend as in Fig. 8
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Entropy contours at t=0. The unaccelerated calculation is depicted in black, the implicit calculation with 16 dual time-steps depicted in gray.
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Time-averaged skin friction factor on the suction side (SS) and the pressure side (PS) of the rotor
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Comparison of the instantaneous skin friction factor at t=0 on the suction side (SS) and the pressure side (PS) of the rotor. The time-averaged skin friction factor from the reference solution is plotted in gray. The enlargement at the bottom shows the region on the suction side where the instantaneous fluctuations are the most pronounced.
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Unsteady pressure fluctuations one node downstream of the stator trailing edge (top) and one node downstream of the rotor leading edge (bottom) during two blade passing periods
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Pressure amplitudes on the rotor, comparison of the calculation with a blade count ratio of 80:80 with that using the original blade count ratio of 78:80
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Phase of the first harmonic on the stator and the rotor, comparison of the calculation with a blade count ratio of 80:80 with that using the original blade count ratio of 78:80. TE: trailing edge, LE: leading edge, PS: pressure side, SS: suction side.
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Entropy distribution in the rotor along a grid line in pitchwise direction (near the interface)
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Phase angle of the first and second entropy harmonic along a gridline in the pitchwise direction (near the interface)

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