Natural Transition Phenomena on an Axial Compressor Blade

[+] Author and Article Information
J. D. Hughes, G. J. Walker

School of Engineering, University of Tasmania, Hobart, Australia

J. Turbomach 123(2), 392-401 (Feb 01, 2000) (10 pages) doi:10.1115/1.1351816 History: Received February 01, 2000
Copyright © 2001 by ASME
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Cross section of compressor blading at midblade height, showing typical instantaneous wake dispersion: SS=suction side, PS=pressure side, a=circumferential offset of stator leading edge from center of IGV wake street.
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Variation of stator blade surface velocity distribution with loading at midblade height: Reref=120,000
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Temporal variation of ensemble-averaged turbulence level 〈Tu〉 (percent) on stator stagnation streamline at inflow measurement plane 55.7 percent axial distance upstream of stator leading edge; variation with stator loading and IGV clocking
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Comparison of predicted T–S wave frequency and measured instability wave packet frequency
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Top: quasi-wall shear stress record from a hot-film gage located at s*=0.3108 on the stator suction surface for the medium loading case. High-pass filtered signal amplified five times and superimposed. Darker shaded regions indicate turbulent flow; lighter shaded regions indicate instability wave occurrence. Bottom: modulus of the Morlet wavelet transform for the quasi-wall shear stress record. Hatching indicates frequency range under consideration by the detection algorithm.
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Simultaneous quasi-wall shear stress records from five gages spanning s*=0.1825–0.4390 on the stator suction surface. High-pass filtered traces amplified five times and overlaid on each raw signal. Darker shaded regions indicate turbulent flow; lighter shaded regions indicated instability wave occurrence. Individual events from Fig. 5 are highlighted by dashed lines.
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Ensemble-averaged intermittency (shading) and probability of instability wave occurrence (line contours). Dashed line indicates 10 percent probability contour for relaxing nonturbulent flow: (a) IGV wake street on rotor (a/S=0.00); (b) IGV wake street in passage (a/S=0.50)




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