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TECHNICAL PAPERS

Pressure Surface Separations in Low-Pressure Turbines—Part 1: Midspan Behavior

[+] Author and Article Information
Michael J. Brear, Howard P. Hodson

Whittle Laboratory, Cambridge University, Cambridge, UK

Neil W. Harvey

Rolls-Royce, plc, Derby, UKe-mail: neil.harvey@rolls-royce.com

J. Turbomach 124(3), 393-401 (Jul 10, 2002) (9 pages) doi:10.1115/1.1450764 History: Received October 20, 2000; Online July 10, 2002
Copyright © 2002 by ASME
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References

Curtis,  E. M., Hodson,  H. P., Banieghbal,  M. R., Denton,  J. D., Howell,  R. J., and Harvey,  N. W., 1996, “Development of Blade Profiles for Low Pressure Turbine Applications,” ASME J. Turbomach., 119, pp. 531–538.
Yamamoto, A., Tominaga, J., Matsunuma, T., and Outa E., 1994, “Detailed Measurements of Three-Dimensional Flows and Losses Inside an Axial Turbine Rotor,” ASME Paper No. 94-GT-348.
Hodson, H. P., and Addison, J. S., 1988, “Wake-Boundary Layer Interactions in an Axial Flow Turbine Rotor at Off-Design Conditions,” ASME Paper No. 88-GT-233.
Scrivener, C. T. J., Connolly, C. F., Cox, J. C., and Dailey, G. M., 1991, “Use of CFD in the Design of a Modern Multistage Aero Engine LP Turbine Design,” I. Mech. E. Paper No. C423/056.
Hodson,  H. P., and Dominy,  R. G., 1987, “The Off-Design Performance of a Low-Pressure Turbine Cascade,” ASME J. Turbomach., 109, pp. 201–209.
Yamamoto,  A., and Nouse,  H., 1988, “Effects of Incidence on Three-Dimensional Flows in a Linear Turbine Cascade,” ASME J. Turbomach., 110, No. 4, pp. 486–496.
He,  L., 1998, “Unsteady Flow in Oscillating Turbine Cascades—Part 1: Linear Cascade Experiment,” ASME J. Turbomach., 120, pp. 262–268.
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” (2001-GT-438), ASME J. Turbomach., 124, pp. 402–409.
Brear, M. J., 2000, “Pressure Surface Separations in Low Pressure Turbines,” Ph. D dissertation, Cambridge University, Cambridge, UK.
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, to appear in the ASME J. Turbomach.
Drela, M., and Youngren, H., 1995, “A User’s Guide to Mises 2.3,” MIT Computational Aerospace Sciences Laboratory Report.
Walraevens,  R. E., and Cumpsty,  N. A., 1995, “Leading Edge Separation Bubbles on Turbomachine Blades,” ASME J. Turbomach., 117, pp. 115–125.
Watmuff,  J. H., 1999, “Evolution of a Wave Packet Into Vortex Loops in a Laminar Separation Bubble,” J. Fluid Mech., 397, pp. 119–169.
Hazarika,  B. K., and Hirsch,  C., 1997, “Transition Over C4 Leading Edge and Measurement of Intermittency Factor Using PDF of Hot-Wire Signal,” ASME J. Turbomach., 119, July, pp. 412–425.
Dovgal,  A. V., Kozlov,  V. V., and Michalke,  A., 1996, “Laminar Boundary Layer Separation: Instability and Associated Phenomena,” Prog. Aerosp. Sci., 30, pp. 61–94.
Fiedler,  H. E., and Fernholz,  H. H., 1990, “On Management and Control of Turbulent Shear Flows,” Prog. Aerosp. Sci., 27, pp. 305–387.
Castro,  I. P., and Epik,  E., 1998, “Boundary Layer Development After a Separated Region,” J. Fluid Mech., 374, pp. 91–116.
White, F. M., 1991, Viscous Fluid Flow, McGraw-Hill, 2nd Edition, New York, NY.
Roshko,  A., 1993, “Perspectives on Bluff Body Aerodynamics,” J. Wind. Eng. Ind. Aerodyn., 49, pp. 101–120.
Horton, H. P., 1969, “A Semi-Empirical Theory for the Growth and Bursting of Laminar Separation Bubbles,” ARC current papers No. 1073.
Denton,  J. D., 1993, “Loss Mechanisms in Turbomachines,” ASME J. Turbomach., 115, pp. 621–656.

Figures

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Blade A and the angles of incidence studied
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(a) Wake at 125 percent Cx, and (b) pressure surface stagnation pressure loss traverses at 95 percent Cx (Re2=130,000, steady inflow)
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Pressure surface stagnation pressure loss variation with Re2 (no wake passing, SI=steady inflow, G=grid,M=model)
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Predicted contours of isentropic velocity around the leading edge
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Isentropic velocities from numerical prediction and experiment (a) under steady inflow (Re2=130,000), and (b) at 0 deg incidence (Re2=130,000)
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Smoke wire visualization at i=−10 deg (Re2=130,000, steady inflow)
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Contours of uRMS/V2 along the pressure surface (contour level=0.01V2,Re2=130,000, steady inflow)
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Profiles of (a) ū/V2 and (b) uRMS/V2 throughout the pressure surface separation (i=0 deg,Re2=130,000, no grid)
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Maximum uRMS along the pressure surface for (a) steady inflow (Re2=130,000, steady inflow), and (b) i=+10 deg (Re2=130,000, no wake passing)
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Time traces of (uRAW−ū)/V2 along the center of the separated shear layer for (a) i=+10 deg (Re2=130,000, steady inflow), and (b) i=0 deg,f̄=0.29 (Re2=130,000, wake passing)
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Acceleration parameter along the pressure surface for i=0 deg (Re2=130,000, steady inflow)
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uRMS/V from reattachment to 95 percent Cx (i=0 deg,Re2=130,000, steady inflow)
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The model of the pressure surface separation
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Turbulent shear stress coefficient versus aspect ratio of the pressure surface separation (no wake passing)
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(a) Modeled dissipation rate, and (b) cube of isentropic velocity along the pressure surface (Re2=130,000, steady inflow)

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