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Flow visualisation experiments for turbine film cooling

Published online by Cambridge University Press:  03 February 2016

C. A. Coat  and
G. D. Lock
C. A. Coat
Affiliation:
Department of Mechanical Engineering, University of Bath, UK
G. D. Lock
Affiliation:
Department of Mechanical Engineering, University of Bath, UK
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Abstract

Flow visualisation experiments related to turbine film cooling have been conducted. These investigated the fluid mechanics of coolant ejection using a large-scale, flat-plate model at engine-representative Reynolds numbers in a low-speed tunnel with ambient-temperature mainstream flow. The coolant trajectories were captured using a fine nylon mesh covered with thermochromic liquid crystals, allowing measurement of gas temperature contours in planes perpendicular to the flow. Three injection geometries were assessed: cylindrical holes with stream-wise injection, cylindrical holes with cross-stream injection, and fan-shaped holes. The data demonstrated that the cylindrical holes produced discrete jets, which lifted off the surface at high coolant-to-mainstream momentum flux ratios; these jets were characterised by the kidney-shaped stream-tubes expected for injection into cross-flow. The jets injected with cross-stream momentum exhibited a more obvious kidney-shaped cross-section, which rotated with distance downstream of injection. The jets from the fan-shaped holes were attached to the surface even at high momentum flux ratios, were more diffuse, and exhibited two cores of high temperature. The trajectory visualisation data were used to interpret the adiabatic cooling effectiveness measured at the surface.

Type
Research Article
Information
The Aeronautical Journal , Volume 108 , Issue 1086 , August 2004 , pp. 403 - 409
Copyright
Copyright © Royal Aeronautical Society 2004 

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References

1. Denton, J.D. Loss mechanisms in turbomachines, ASME J of Turbomachinery, 1993, 115, pp 621–656.Google Scholar
2. Burd, S.W., Kaszeta, R.W. and Simon, T.W. Measurements in film cooling flows: Hole L/D and turbulence intensity effects, ASME J of Turbomachinery, 1998, 120, pp 791–798.Google Scholar
3. Ahn, J., Jung, I.S. and Lee, J.S. Film cooling from two rows of holes with opposite orientation angles: injection behavior and adiabatic film cooling effectiveness, Int J of Heat and Fluid Flow, 2003, 24, pp 91–99.Google Scholar
4. Honami, S., Shizawa, T. and Uchiyama, A. Behavior of the laterally injected jet in film cooling: measurements of surface temperature and velocity/temperature field within the jet, ASME J of Turbomachinery, 1994, 116, pp 106–112.Google Scholar
5. Mee, D.J., Ireland, P.T. and Bather, S. Measurement of the temperature field downstream of simulated leading-edge film-cooling holes, Experiments in Fluids, 1999, 27, pp 273–283.Google Scholar
6. Sargison, J.E., Guo, S.M., Oldfield, M.L.G., Lock, G.D. and Rawl-Inson, A.J. Flow visualisation of a converging slot-hole film-cooling geometry, 2002, ASME Paper GT-2002-30177.Google Scholar
7. Ireland, P.T. and Jones, T.V. Liquid crystal measurements of heat transfer and surface shear stress. Meas Sci Technol, 2000, 11, pp 969–986.Google Scholar
8. Wang, Z., Ireland, P.T. and Kohler, S.T. Gas temperature measurement in internal cooling passages, 1996, ASME Paper 96-GT-534.Google Scholar
9. Syson, B.J., Pilbrow, R.G. and Owen, J.M. Effect of rotation on temperature response of thermochromic liquid crystal, Int J of Heat and Fluid Flow, 1999, 17, pp 491–499.Google Scholar
10. Rowbury, D.A., Oldfield, M.L.G. and Lock, G.D. A method of correlating the influence of external crossflow on the discharge coefficient of film cooling holes, ASME J of Turbomachinery, 2001, 123, pp 258–265.Google Scholar
11. Haven, B.A. and Kurosaka, M. Kidney and anti-kidney vortices in crossflow jets. J Fluid Mech, 1997, 352, pp 27–64.Google Scholar