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TECHNICAL BRIEFS

Aerodynamic Entropy Generation Rate in a Boundary Layer With High Free Stream Turbulence

[+] Author and Article Information
Philip C. Griffin, Mark R. D. Davies

Stokes Research Institute, Department of Mechanical & Aeronautical Engineering, University of Limerick, Plassey Technological Park, Limerick, Republic of Ireland

J. Fluids Eng 126(4), 700-703 (Sep 10, 2004) (4 pages) doi:10.1115/1.1780170 History: Received June 27, 2002; Revised March 05, 2004; Online September 10, 2004

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References

Denton,  J. D., 1993, “Loss Mechanisms in Turbomachines,” ASME J. Turbomach., 115, pp. 621–656.
Davies,  M. R. D., and O’Donnell,  F. K., 1999, “Local Measurement of Loss Using Heated Thin Film Sensors,” ASME J. Turbomach., 121, pp. 814–818.
Griffin, P. C., Davies, M. R. D., O’Donnell, F. K., and Walsh, E., 2002, “The Effect of Reynolds Number, Compressibility and Free Stream Turbulence on Profile Entropy Generation Rate,” ASME Paper no. GT-2002-30330.
O’Donnell, F. K., 2000, “The Measurement of Aerodynamic Entropy Generation in a Turbine Blade Boundary Layer,” Ph.D. Thesis, University of Limerick, Limerick, Ireland.
O’Donnell, F. K., and Davies, M. R. D., 2000 “Turbine Blade Entropy Generation Rate, Part II: The Measured Loss,” ASME Paper no. 2000-GT-266.
Thole,  K. A., and Bogard,  D. G., 1996, “High Freestream Turbulence Effects on Turbulent Boundary Layers,” ASME J. Fluids Eng., 118, pp. 276–284.
Kline, S. J., and McClintock, F. A., 1953, “Describing Uncertainties in Single Sample Experiments,” Mechanical Engineering, Jan 1953, p. 3.
Volino, R. J., Schultz, M. P., and Pratt, C. M., 2001, “Conditional Sampling in a Transitional Boundary Layer Under High Free Stream Turbulence Conditions,” ASME Paper no. 2001-GT-0192.
Westin,  K. J. A., Boiko,  A. V., Klingmann,  B. G. B., Kozlov,  V. V., and Alfredsson,  P. H., 1994, “Experiments in a Boundary Layer Subjected to Free Stream Turbulence. Part 1. Boundary Layer Structure and Receptivity,” J. Fluid Mech., 281, pp. 193–218.
Klebanoff, P. S., 1955, “Characteristics of Turbulence in a Boundary Layer With Zero Pressure Gradient,” NACA Report no. 1247.
Griffin, P. C., 2003, “The Effect of Freestream Turbulence on Aerodynamic Entropy Generation Rate,” Ph.D. Thesis, University of Limerick, Limerick, Ireland.
Hinze, J. O., 1975, “Turbulence,” 2nd Edition, McGraw-Hill, New York.
Mathieu, J., and Scott, J., 2000, “An Introduction to Turbulent Flow,” Chapter 2, Cambridge University Press, U.K.
Boiko, A. V., Grek, G. R., Dovgal, A. V., and Kozlov, V. V., 2002, “The Origin of Turbulence in Near Wall Flows,” Springer-Verlag, Berlin-Heidelberg.

Figures

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Incompressible turbine cascade and hot-wire traverse assembly
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Measured suction surface pressure distribution (expressed as the pressure coefficient Cp) for Rec=76,000, for both 0.8% and 5.0% FST
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Comparison between measured boundary layer velocity profiles at 5.7% SSL, Rec=76,000 both turbulence levels, δ=500 μm, Uδ=15 m/s. Also shown is the distribution of percentage turbulence.
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(a) Distribution of the dissipation coefficient Cd derived from measurements of Ṡgen at Rec=76,000 for both 0.8% and 5.0% FST. (b) The corresponding hot-film skewness distribution.
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Energy spectra of the fluctuating hot-wire and film voltage signals (analogous to u) at different wall-normal positions in the boundary layer for 5.7% SSL with Rec=76,000. (a) η=0.1, 5.0% FST; (b) η=0.4, 5.0% FST; (c) η>1, 5.0% FST; (d) η=0.4, 0.8% FST; (e) Wall, 5.0% FST; (f) η>1, 0.8% FST.

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