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TECHNICAL PAPERS

Response of a Laminar Separation Bubble to an Impinging Wake

[+] Author and Article Information
J. P. Gostelow, R. L. Thomas

Department of Engineering, University of Leicester, Leicester, LE1 7RH, UK

J. Turbomach 127(1), 35-42 (Feb 09, 2005) (8 pages) doi:10.1115/1.1829729 History: Received December 01, 2002; Revised March 01, 2003; Online February 09, 2005
Copyright © 2005 by ASME
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References

Luo,  J., and Lakshminarayana,  B., 1997, “Numerical Simulation of Turbine Blade Boundary Layer and Heat Transfer and Assessment of Turbulence Models,” ASME J. Turbomach., 119, pp. 794–801.
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 1–4,” ASME J. Turbomach., 119(1), pp. 114–127; ibid., pp. 128–139; 119(2), pp. 234–246; 119(3), pp. 426–444.
Mayle,  R. E., 1991, “The Role of Laminar-Turbulent Transition in Gas Turbines,” ASME J. Turbomach., 113, pp. 509–537 (1991 IGTI Scholar Lecture).
Hughes,  J. D., and Walker,  G. J., 2001, “Natural Transition Phenomena on an Axial Compressor Blade,” ASME J. Turbomach., 123, pp. 392–401.
D’Ovidio, A., Harkins, J. A., and Gostelow, J. P., 2001, “Interaction Between a Laminar Separation Bubble and a Turbulent Spot Under a Strong Adverse Pressure Gradient,” Proc. of 4th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ATI-CST-077/1.
D’Ovidio, A., Harkins, J. A., and Gostelow, J. P., 2001, “Turbulent Spot in Strong Adverse Pressure Gradients, Part I: Spot Behavior,” ASME Paper No. 2001-GT-0194.
D’Ovidio, A., Harkins, J. A., and Gostelow, J. P., 2001, “Turbulent Spot in Strong Adverse Pressure Gradients. Part II: Spot Propagation and Spreading Rate,” ASME Paper No. 2001-GT-0406.
Gostelow, J. P., Hodson, H. P., and Walker, G. J., 1999, “Comparisons Between Triggered Turbulent Spots and Unsteady Transition Phenomena on Compressor and Turbine Blading,” Laminar-Turbulent Transition, Proc. IUTAM Symposium, H. F. Fasel and W. S. Saric, eds., Sedona, AZ, pp. 365–370.
Solomon,  W. J., Walker,  G. J., and Gostelow,  J. P., 1996, “Transition Length Prediction for Flows With Rapidly Changing Pressure Gradients,” ASME J. Turbomach., 118, pp. 744–751.
Schubauer, G. B., and Klebanoff, P. S., 1955, “Contributions on the Mechanics of Boundary Layer Transition,” NACA Report 1289.
Gostelow,  J. P., Walker,  G. J., Solomon,  W. J., Hong,  G., and Melwani,  N., 1997, “Investigation on the Calmed Region Behind a Turbulent Spot,” ASME J. Turbomach., 119, pp. 802–809.
Walker,  G. J., 1989, “Transitional Flow on Axial Turbomachine Blading,” AIAA J., 27(5), pp. 595–602.
Lou, W., and Hourmouziadis, J., 2000, “Separation Bubbles Under Steady and Periodic-Unsteady Main Flow Conditions,” ASME Paper No. 2000-GT-0270.
Narasimha,  R., 1957, “On the Distribution of Intermittency in the Transition Region of the Boundary Layer,” J. Aeronaut. Sci., 24, pp. 711–712.
Gostelow,  J. P., Blunden,  A. R., and Walker,  G. J., 1994, “Effects of Free-Stream Turbulence and Adverse Pressure Gradients on Boundary Layer Transition,” ASME J. Turbomach., 116, pp. 392–404.
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Sanz, W., and Platzer, M. F., 1996, “On the Navier-Stokes Calculation of Separation Bubbles,” ASME Paper 96-GT-487.

Figures

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Schematic view of flat plate and wake generator
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Measured pressure distribution compared with self-similar distribution
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Velocity perturbation contours at x=0.65 m
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RMS of velocity at x=0.65 m
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Contours of rms of velocity for 9 phases of the cycle
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Ensemble-averaged velocity contours for 9 phases of the cycle
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Boundary layer velocity profiles at different phases for x=0.750 m
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Representative velocity traces at y=2.0 mm
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(Color) (a) (upper) Measured x∼t diagram for intermittency with velocity traces and relaxation parameter superimposed and (b) (lower). Measured x∼y diagram of ensemble-averaged velocity contours in undisturbed boundary layer showing outline of separation bubble.
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Measured intermittency distribution (○) compared to Narasimha’s universal distribution

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