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TECHNICAL PAPERS

Clocking Effects in a 1.5 Stage Axial Turbine—Steady and Unsteady Experimental Investigations Supported by Numerical Simulations

[+] Author and Article Information
U. Reinmöller, B. Stephan, S. Schmidt, R. Niehuis

Institut für Strahlantriebe und Turboarbeitsmaschinen, RWTH Aachen, University of Technology, D-52062 Aachen, Germany

J. Turbomach 124(1), 52-60 (Feb 01, 2001) (9 pages) doi:10.1115/1.1425811 History: Received February 01, 2001
Copyright © 2002 by ASME
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References

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Figures

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Investigated clocking positions
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Measured radially averaged dimensionless static pressure behind the rotor for five stator-stator positions
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Measured radially averaged Mach-number behind the rotor for five stator-stator positions
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Mach-number-distribution behind the rotor for ten clocking positions with secondary flow field, pneumatic measurements, shifted values
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pt/pt0-distribution behind the rotor for ten clocking positions, pneumatic measurements, shifted values
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Predicted entropy-contours, at 16 percent, 51 percent and 82 percent h/H, 0 deg clocking angle
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Measured turbulence intensity versus time (four periods) at mid-span, clocking angle 4 deg and 9 deg, behind rotor, unshifted values
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Secondary vorticity with secondary flow field calculated from time-accurate measurements, three clocking angles, four rotor-stator positions, unshifted values
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Predicted entropy contours at hub region (16 percent h/H) at a discrete time step, CFD simulation, clocking angle of 0 deg
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Radially averaged Mach-number behind the second stator, five clocking angles, pneumatic measurements, shifted and unshifted values
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Measured radially time-averaged secondary vorticity behind second stator, three clocking angles (4 deg, 7 deg, 9 deg)
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Predicted entropy contours at mid-span for a distinct stator-rotor position, 0 deg clocking angle
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Turbulence intensity and abs. velocity (4 periods) versus time at clocking angles 4 deg and 9 deg behind the second stator, unshifted values, mid-span
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Total pressure loss of the second stator at five clocking angles, radially and circumferentially averaged, shifted values
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Relative efficiency versus clocking angle, comparison with numerical results, mid-span

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