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TECHNICAL PAPERS

The Transition Mechanism of Highly Loaded Low-Pressure Turbine Blades

[+] Author and Article Information
R. D. Stieger, H. P. Hodson

Whittle Laboratory, Cambridge University, Engineering Department, Madingley Road, Cambridge CB3 0DY, UK

J. Turbomach 126(4), 536-543 (Dec 29, 2004) (8 pages) doi:10.1115/1.1773850 History: Received December 01, 2002; Revised March 01, 2003; Online December 29, 2004
Copyright © 2004 by ASME
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References

Schulte, V., and Hodson, H. P., 1994, “Wake-Separation Bubble Interaction in Low Pressure Turbines,” AIAA/SAE/ASME/ASEE 30th Joint Propulsion Conference and Exhibit, Indianapolis, IN.
Schulte,  V., and Hodson,  H. P., 1998, “Unsteady Wake-Induced Boundary Layer Transition in High Lift LP Turbines,” ASME J. Turbomach., 120, pp. 28–35.
Curtis, E. M., Hodson, H. P., Banieghbal, M. R., Denton, J. D., and Howell, R. J., 1996, “Development of Blade Profiles for Low Pressure Turbine Applications,” ASME Paper 96-GT-358.
Howell, R. J., Ramesh, O. N., Hodson, H. P., Harvey, N. W., and Schulte, V., 2000, “High Lift and Aft Loaded Profiles for Low Pressure Turbines,” ASME Paper 2000-GT-261.
Cobley, K., Coleman, N., Siden, G., and Arndt, N., 1997, “Design of New Three Stage Low Pressure Turbine for BMW Rolls-Royce BR715 Engine,” ASME Paper 97-GT-419.
Haselbach, F., Schiffer, H.-P., Horsman, M., Dressen, S., Harvey, N., and Read, S., 2001, “The Application of Ultra High Lift Blading in the BR715 LP Turbine,” ASME Paper 2001-GT-0436.
Brunner, S., Fottner, L., and Schiffer, H.-P., 2000, “Comparison of Two Highly Loaded Low Pressure Turbine Cascades Under the Influence of Wake-Induced Transition,” ASME Paper 2000-GT-268.
Howell, R. J., Hodson, H. P., Schulte, V., Schiffer, H.-P., Haselbach, F., and Harvey, N. W., 2001, “Boundary Layer Development on the BR710 and BR715 LP Turbines—The Implementation of High Lift and Ultra High Lift Concepts,” ASME Paper 2001-GT-0441.
Wu,  X., Jacobs,  R. G., Hunt,  J. C. R., and Durbin,  P. A., 1999, “Simulation of Boundary Layer Transition Induced by Periodically Passing Wakes,” J. Fluid Mech., 398, pp. 109–153.
Johnson, M. W., 2002, “Predicting Transition Without Empiricism or DNS,” ASME Paper GT-2002-30238.
D’Ovidio, A., Harkins, J. A., and Gostelow, J. P., 2001 a, “Turbulent Spots in Strong Adverse Pressure Gradients: Part 1—Spot Behavior,” ASME Paper 2001-GT-0194.
D’Ovidio, A., Harkins, J. A., and Gostelow, J. P., 2001, “Turbulent Spots in Strong Adverse Pressure Gradients: Part II—Spot Propagation and Spreading Rates,” ASME Paper 2001-GT-0406.
George, W. K., 1975, “Limitations to Measuring Accuracy Inherent in the Laser-Doppler Signal,” Proc. LDA Symp., Copenhagen.
Meyer,  R. X., 1958, “The Effects of Wakes on the Transient Pressure and Velocity Distributions in Turbomachines,” ASME J. Basic Eng., Oct. pp. 1544–1552.
Hodson, H. P., 1998, “Bladerow Interactions In Low Pressure Turbines,” Blade Row Interference Effects Axial Turbomachinery Stages (VKI Lecture Series No. 1998-02), Von Karman Institute, Feb. 9–12.
Stieger, R. D., Hollis, D., and Hodson, H. P., 2003 “Unsteady Surface Pressures due to Wake Induced Transition in a Laminar Separation Bubble on a LP Turbine Cascade,” ASME Paper GT-2003-38303.
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 Compressors and Turbines: Part 1—Composite Picture,” ASME J. Turbomach., 119, pp. 114–127.
Stieger, R. D., 2002, “The Effects of Wakes on Separating Boundary Layers in Low Pressure Turbines,” Ph.D. thesis, University of Cambridge, Cambridge, UK.
Stieger, R. D., and Hodson, H. P., 2003, “Unsteady Dissipation Measurements on a Flat Plate Subject to Wake Passing,” submitted to the 5th European Turbomachinery Conference, Prague.

Figures

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Bar passing cascade with T106 profile
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Isentropic surface velocity distribution measured on the T106 LP turbine cascade
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Space-time diagram of boundary layer edge velocity nondimensionalised by V2is
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Space-time diagram of measured H12
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Space-time diagram of measured boundary layer TKE thickness
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Boundary layer structure prior to the wake arrival. Vector plots of (a) ensemble average velocity and (b) perturbation velocity. Contour plots of nondimensional (c) vorticity, (d) turbulent kinetic energy, and (e) production of TKE. Re=1.6×105,sb/sc=1.
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Boundary layer structure during the interaction of wake and separated shear layer. Re=1.6×105,sb/sc=1.
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Boundary layer structure through the wake-induced turbulent strip. Re=1.6×105,sb/sc=1.
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Boundary layer structure in the calmed region. Re=1.6×105,sb/sc=1.
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Sketch of rollup mechanism
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Schematic of the transition mechanism resulting from the interaction of a wake and separating boundary layer

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