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TECHNICAL PAPERS

Investigation of Unsteady Aerodynamic Blade Excitation Mechanisms in a Transonic Turbine Stage—Part II: Analytical Description and Quantification

[+] Author and Article Information
Björn Laumert

KTH—The Royal Institute of Technology, Heat and Power Technology, 100 44 Stockholm, Swedene-mail: laumert@egi.kth.se

Hans Mårtensson

Volvo Aero Corporation, Propulsion Systems, Military Engines Division, 461 81 Trollhättan, Sweden

Torsten H. Fransson

KTH—The Royal Institute of Technology, Heat and Power Technology, 100 44 Stockholm, Sweden

J. Turbomach 124(3), 419-428 (Jul 10, 2002) (10 pages) doi:10.1115/1.1458579 History: Received October 24, 2000; Online July 10, 2002
Copyright © 2002 by ASME
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References

Korakianitis,  T., 1992, “On the Prediction of Unsteady Forces on Gas Turbine Blades: Part 1—Description of the Approach,” ASME J. Turbomach., 114, pp. 114–122.
Korakianitis,  T., 1992, “On the Prediction of Unsteady Forces on Gas Turbine Blades: Part 2—Analysis of the Results,” ASME J. Turbomach., 114, pp. 123–131.
Freudenreich, K., Jöcker, M., and Fransson, T. H., 2000, “Gust and Forcing Function in a Transonic Turbine,” submitted for the 4th European Conference on Turbomachinery—Fluid Dynamics and Thermodynamics Firenze, 20th–23rd Mar.
Clark, J. P., Stetson, G. M., Magge, S. S., Ni, R. H., Haldemann, C. W., and Dunn, M. G., 2000, “The Effect of Airfoil Scaling on the Predicted Unsteady Loading on the Blade of a 1 and 1/2 Stage Transonic Turbine and a Comparison with Experimental Results,” ASME Paper No. 2000-GT-0446.
Haldemann, C. W., Dunn, M. G., Abhari, R. S., Johnson, P. D., and Montesdeoca, X. A., 2000, “Experimental and Computational Investigation of the Time-Averaged and Time-Resolved Pressure Loading on a Vaneless Counter-Rotating Turbine,” ASME Paper No. 2000-GT-0445.
Denos,  R., Sieverding,  C. H., Arts,  T., Brouckaert,  J. F., Paniagua,  G., and Michelassi,  V., 1999, “Experimental Investigation of the Unsteady Rotor Aerodynamics of a Transonic Turbine Stage,” IMECHE Conf. Trans., 3. European Conference on Turbomachinery, pp. 271–287.
Laumert, B., Mårtensson, H., and Fransson, T. H., 2001, “Investigation of Unsteady Aerodynamic Blade Excitation Mechanisms in a Transonic Turbine Stage—Part I: Phenomenological Identification and Classification,” submitted to the ASME TURBO EXPO Land, Sea and Air Conference.
Laumert, B., Mårtensson, H., and Fransson, T. H., 2000, “Investigation of the Flowfield in the Transonic VKI BRITE EURAM Turbine Stage with 3-D Steady and Unsteady N-S Computations,” ASME Paper No. 2000-GT-0433.

Figures

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RMS/Q versus M2 for the vane at midspan
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Pressure amplitude of the 1st rotor passing frequency along the vane surface at 50% span
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Pressure amplitude of the 2nd rotor passing frequency along the vane surface at 50% span
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RMS/Q versus span for vane at design conditions
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RMS/Q versus M2 for the rotor at midspan
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Pressure amplitude of the 1st vane passing frequency along the rotor surface at 50% span
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Pressure amplitude of the 2nd vane passing frequency along the rotor surface at 50% span
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Space-time map of the rotor surface pressure perturbations for the subsonic test case at 50% span
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Space-time map of the rotor surface pressure perturbations for the design test case at 50% span
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Space-time map of the rotor surface pressure perturbations for the high M2 test case at 50% span
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RMS/Q versus span for rotor at design conditions
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Pressure amplitude of the 1st vane passing frequency along the rotor surface; design OP
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Pressure amplitude of the 2nd vane passing frequency along the rotor surface; design OP
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Space-time map of the rotor surface pressure perturbations for the design test case at 15% span
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Space-time map of the rotor surface pressure perturbations for the design test case at 85% span
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Amplitude of the normalized force perpendicular to the rotor blade chord versus span; design OP
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Flex mode: 1st harm. amplitude and phase of the force acting on the front suction side, the aft suction side and the pressure side at 15, 50, and 85% span. The summed total force acting on the whole blade arc is also shown.
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Amplitude of the chordwise acting normalized force versus span; design OP
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Bending mode: 1st harm. amplitude and phase of the force acting parallel to the chord at 50% span
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Torsion mode: 1st harm. amplitude and phase of the torque at 50% span
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Amplitude of the normalized torque versus span; design OP
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Amplitude of the force perpendicular to the rotor blade chord versus M2 at midspan
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Amplitude of the chordwise acting force versus M2 at midspan
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Amplitude of the torque versus M2 at midspan

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