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TECHNICAL PAPERS

Blade Count and Clocking Effects on Three-Bladerow Interaction in a Transonic Turbine

[+] Author and Article Information
H. D. Li, L. He

School of Engineering, University of Durham, South Road, Durham DH1 3LE, UK

J. Turbomach 125(4), 632-640 (Dec 01, 2003) (9 pages) doi:10.1115/1.1622711 History: Received December 01, 2001; Revised March 01, 2002; Online December 01, 2003
Copyright © 2003 by ASME
Topics: Blades , Stators , Rotors , Turbines
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References

Capece,  V. R., Manwaring,  S. R., and Fleeter,  S., 1986, “Unsteady Blade Row Interactions in a Multi-stage Compressor,” AIAA J., Propul. Power 2(2), pp. 168–174.
Hsu,  S. T., and Wo,  A. M., 1998, “Reduction of Unsteady Blade Loading by Beneficial Use of Vortical and Potential Disturbances in an Axial Compressor with Rotor Clocking,” ASME J. Turbomach., 120, pp. 705–713.
Huber,  F. W., Johnson,  P. D., Sharma,  O. P., Staubach,  J. B., and Goddis,  S. W., 1996, “Performance Improvement Through Indexing of Turbine Airfoils: Part I-Experimental Investigation,” ASME J. Turbomach., 118, pp. 630–635.
Griffin,  L. W., Huber,  F. W., and Sharma,  O. P., 1996, “Performance Improvement Through Indexing of Turbine Airfoils: Part II-Numerical Simulation,” ASME J. Turbomach., 118, pp. 636–642.
Dorney, D. J., and Sharma, O. P., 1996, “A Study of Turbine Performance Increase Through Airfoil Clocking,” AIAA Paper No. 96-2816.
Cizmas, P., and Dorney, D. J., 1998, “Parallel Computation of Turbine Blade Clocking,” AIAA Paper No. 98-3598.
Arnone,  A., Marconcini,  M., Pacciani,  R., Schipani,  C., and Spano,  E., 2002, “Numerical Investigation of Airfoil Clocking in a Three-Stage Low-Pressure Turbine,” ASME J. Turbomach., 124, pp. 61–68.
Reinmoller,  U., Stephan,  B., Schmidt,  S., and Niehuis,  R., 2002, “Clocking Effects in 1 1.5 Stage Axial Turbine-Steady and Unsteady Experimental Investigations Supported by Numerical Simulations,” ASME J. Turbomach., 124, pp. 52–60.
Hummel,  F., 2002, “Wake-Wake Interaction and Its Potential for Clocking in A Transonic High Pressure Turbine,” ASME J. Turbomach., 124, pp. 69–76.
Kielb,  R. E., and Kaza,  K. R. V., 1984, “Effects of Structural Coupling on Mistuning Cascade Flutter and Response,” ASME J. Eng. Gas Turbines Power, 106, pp. 17–24.
Miller,  R. J., Moss,  R. W., Ainsworth,  R. W., and Harvey,  N. W., 2001, “Time-Resolved Vane-Rotor-Vane Interaction in A Transonic One and A Half Stage Turbine,” Proc. of IMechE, Part A, J. of Power and Energy, 215, pp. 675–685.
Baldwin, B. S., and Lomax, H., 1978, “Thin Layer Approximation and Algebraic Model for Separated Turbulent Flows,” AIAA Paper 78-0257.
Jameson, A., Schmidt, W., and Turkel, E., 1981, “Numerical Solutions of the Euler Equations by Finite Volume Method using Runge-Kutta Time-Stepping Scheme,” AIAA Paper 81-1259.
He,  L., 2000, “Three-Dimensional Unsteady Navier-Stokes Analysis of Stator-Rotor Interaction in Axial-Flow Turbines,” Proc. of IMechE, Part A, J. of Power and Energy, 214, pp. 13–22.
Giles,  M. B., 1990, “Nonreflecting Boundary Conditions for Euler Equation Calculations,” AIAA J., 28, No. 12, pp. 2050–2058.
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Figures

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Computational mesh (original experimental configuration)
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Isentropic Mach number distribution
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Pressure time histories at sensor positions S1 and P6 (S1: suction surface 5% axial chord; P6: pressure surface 67% axial chord)
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Spectrum of normal force on a rotor blade (normalized by the first harmonic component, experimental condition, blade counts 12/20/7)
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Time histories of unsteady normal force on stator blades (experimental condition, blade counts: 12/20/7)
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Spectrum of normal force on stator blade 5 (normalized by the first harmonic component, experimental condition, blade counts: 12/20/7)
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Time histories of normal force on rotor blades (Blade counts: 12/20/11)
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Unsteady normal force magnitudes of the stator row for five different blade counts
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Unsteady normal force magnitudes variation with local clocking position
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Unsteady normal force magnitude on stator blades at different clocking positions of blade 1 (blade counts: 12/20/11)
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Sketch showing NGV wake-rotor wake interference (both phases of chopped NGV and rotor wakes seen by stator are determined by instantaneous rotor phase θrotor)
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Time averaged entropy contours at different clocking positions (stator L.E. relative to NGV L.E.) (equal NGV stator blade count: 12/20/12); (a) clocking at 0.2 NGV pitch, near maximum forcing, (b) clocking at 0.8 NGV pitch, near minimum forcing.

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