A theoretical model to explain observed rapid large-scale surface heat transfer rate fluctuations associated with the impingement of nozzle guide vane trailing edge shock waves on a transonic turbine rotor blade is described. Experiments were carried out in the Oxford Isentropic Light Piston Cascade Tunnel using an upstream rotating bar system to simulate the shock wave passing. High-frequency surface heat transfer and pressure measurements gave rapidly varying, large, transient signals, which schlieren photography showed to be associated with the impingement of passing shock waves on the surface. Heat transfer rates varying from three times the mean value to negative quantities were measured. A simple first-order perturbation analysis of the boundary layer equations shows that the transient adiabatic heating and cooling of the boundary layer by passing shock waves and rarefactions can give rise to high-temperature gradients near the surface. This in turn leads to large conductive heat transfer rate fluctuations. The application of this theory to measured fluctuating pressure signals gave predictions of fluctuating heat transfer rates that are in good agreement with those measured. It is felt that the underlying physical mechanisms for shock-induced heat transfer fluctuations have been identified. Further work will be necessary to confirm them in rotating experiments.
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April 1989
Research Papers
Surface Heat Transfer Fluctuations on a Turbine Rotor Blade Due to Upstream Shock Wave Passing
A. B. Johnson,
A. B. Johnson
Oxford University, Oxford, United Kingdom
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M. J. Rigby,
M. J. Rigby
Oxford University, Oxford, United Kingdom
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M. L. G. Oldfield,
M. L. G. Oldfield
Oxford University, Oxford, United Kingdom
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R. W. Ainsworth,
R. W. Ainsworth
Oxford University, Oxford, United Kingdom
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M. J. Oliver
M. J. Oliver
Rolls Royce, Derby, United Kingdom
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A. B. Johnson
Oxford University, Oxford, United Kingdom
M. J. Rigby
Oxford University, Oxford, United Kingdom
M. L. G. Oldfield
Oxford University, Oxford, United Kingdom
R. W. Ainsworth
Oxford University, Oxford, United Kingdom
M. J. Oliver
Rolls Royce, Derby, United Kingdom
J. Turbomach. Apr 1989, 111(2): 105-115 (11 pages)
Published Online: April 1, 1989
Article history
Received:
September 25, 1987
Online:
November 9, 2009
Citation
Johnson, A. B., Rigby, M. J., Oldfield, M. L. G., Ainsworth, R. W., and Oliver, M. J. (April 1, 1989). "Surface Heat Transfer Fluctuations on a Turbine Rotor Blade Due to Upstream Shock Wave Passing." ASME. J. Turbomach. April 1989; 111(2): 105–115. https://doi.org/10.1115/1.3262244
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