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TECHNICAL PAPERS

The Effect of Wake Passing on a Flow Separation in a Low-Pressure Turbine Cascade

[+] Author and Article Information
Michael J. Brear

Department of Mechanical and Manufacturing Engineering, University of Melbourne, Australiae-mail: mjbrear@unimelb.edu.au

Howard P. Hodson

Whittle Laboratory Engineering Department, Cambridge University, UKe-mail: hph@eng.cam.ac.uk

J. Fluids Eng 126(2), 250-256 (May 03, 2004) (7 pages) doi:10.1115/1.1667884 History: Received March 04, 2003; Revised October 30, 2003; Online May 03, 2004
Copyright © 2004 by ASME
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References

Brear,  M. J., Hodson,  H. P., and Harvey,  N. W., 2002, “Pressure surface separations in low pressure turbines-part 1: midspan behavior,” ASME J. Turbomach., 124, pp. 393–401.
Halstead,  D. E., Wisler,  D. C., Okiishi,  T. H., Walker,  G. J., Hodson,  H. P., and Shin,  H. W., 1997, “Boundary layer development in axial flow compressors and turbines: part 1 of 4-composite picture,” ASME J. Turbomach., 119, pp. 114–127.
Howell, R. J., Ramesh, O. N., Hodson, H. P., Harvey, N. W., and Schulte, V., 1999, “High lift and aft loaded profiles for low pressure turbines,” ASME paper no. 2000-GT-261.
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Brear,  M. J., Hodson,  H. P., Gonzalez,  P., and Harvey,  N. W., 2002, “Pressure surface separations in low pressure turbines-part 2: interactions with the secondary flow,” ASME J. Turbomach., 124, pp. 402–409.
Denton,  J. D., 1993, “Loss mechanisms in turbomachines,” ASME J. Turbomach., 115, pp. 621–656.
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Figures

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a) The low-pressure turbine blade and b) the ‘Unsflo’ computational mesh
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Isentropic velocity distribution from experiment and timed averaged numerical predictions for steady inflow and i=0 deg (S and R denote separation and reattachment points respectively)
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Instantaneous entropy coefficient and instantaneous streamlines from unsteady predictions with steady inflow and i=0 deg (scale as in Fig. 6)
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Smoke-wire flow visualization of the separation at 0 deg and −10 deg incidence under steady inflow
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Measured time traces of (uRAW−ū)/V2 along the center of the separated shear layer for a) i=−10 deg, steady inflow and b) i=0 deg, f̄=0.29
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Predicted instantaneous streamlines superimposed onto contours of entropy coefficient (f̄=0.89,i=0 deg)
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Predicted contours of vorticity with instantaneous streamlines superimposed at t=0(f̄=0.89,i=0 deg)
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Measured contours of uRMS/V2 at i=0 deg and steady inflow
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Measured contours of ũRMS/V2 during one wake passing period (f̄=0.58,i=0 deg)

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