Heat transfer measurements have been made in the Oxford University Cold Heat Transfer Tunnel employing the transient liquid crystal technique. Complete contours of the heat transfer coefficient have been obtained on the aerofoil surfaces of a large annular cascade of high-pressure nozzle guide vanes (mean blade diameter of 1.11 m and axial chord of 0.0664 m). The measurements are made at engine representative Mach and Reynolds numbers (exit Mach number 0.96 and Reynolds number 2.0 × 106). A novel mechanism is used to isolate five preheated blades in the annulus before an unheated flow of air passes over the vanes, creating a step change in heat transfer. The surfaces of interest are coated with narrow-band thermochromic liquid crystals and the color crystal change is recorded during the run with a miniature CCD video camera. The heat transfer coefficient is obtained by solving the one-dimensional heat transfer equation for all the points of interest. This paper will describe the experimental technique and present results of heat transfer and flow visualization.

Baines, N. C., Oldfield, M. L. G., Jones, T. V., Shultz, D. L., King, P. I., and Daniels, L. C., “A Short-Duration Blowdown Tunnel for Aerodynamic Studies on Gas Turbine Blading,” ASME paper No. 82-GT-312, 1982.
Jones, T. V., “Gas Turbine Studies at Oxford, 1969–1987,” ASME Paper No. 88-GT-112, 1988.
Jones, T. V., Oldfield, M. L. G., Ainsworth, R. W., and Arts, T., “Transient-Cascade Testing in Advanced Methods of Cascade Testing,” AGARDograph AG 328, 1993.
Martinez-Botas, R. F., Main, A. J., Lock, G. D., and Jones, T. V., “A Cold Heat Transfer Tunnel for Gas Turbine Research on an Annular Cascade,” ASME Paper No. 93-GT-248.
Jones, T. V., “A Cold Heat Transfer Tunnel,” OUEL Internal Report No. 1274/78, 1978.
Ireland, P. T., Wang, Z., Jones, T. V., and Byerley, A. R., “A Cold Heat Transfer Tunnel Employing Liquid Crystals for Measuring Full Surface Heat Transfer Coefficients Over Turbine Blade Passages,” presented at the 9th Symposium of Measuring Techniques for Transonic and Supersonic Flow in Cascades and Turbomachines, Oxford, 1988.
Main, A. J., “Experimental and Theoretical Cascade Areodynamics,” First Year Report, Oxford University, 1991.
Harvey, N. W., Wang, Z., Ireland, P. T., and Jones, T. V., “Measurements in Nozzle Guide Vane Passages in Linear and Annular Cascades in the Presence of Secondary Flows,” AGARD-CP-469, Paper 24, 1989.
Ireland, P. T., and Jones, T. V., “The Measurement of Local Heat Transfer Coefficients in Blade Cooling Geometries,” AGARD-CP-390, Paper No. 28, 1986.
Ireland, P. T., and Jones, T. V., “Detailed Measurements of Heat Transfer on and Around a Pedestal in Fully-Developed Channel Flow,” Proc. 8th Int. Heat Transfer Conf., San Francisco, CA, 1986.
Jones, T. V., “Definition of Heat Transfer Coefficient in the Turbine Situation,” Turbomachinery Conference, IMechE Paper No. C423/046, 1991.
Baines, N. C., King, P. I., Oldfield, M. L. G., and Daniels, L. C., “The Use of Tandem Ejector Pumps in an Intermittent Blowdown Tunnel,” ASME Paper No. 84-GT-226.
Martinez-Botas, R. F., Spencer, M. C., Lock, G. D., and Jones, T. V., “The Measurement of Full Surface Heat Transfer Coefficients Over Turbine Blade Passages Using a Cold Heat Transfer Tunnel,” Proceedings of IMechE CCGT-3 Turbomachinery Seminar, London, Oct. 1993.
Wang, Z., “The Application of Thermochromic Liquid Crystals to Detailed Turbine Blade Cooling Measurements,” DPhil Thesis, Oxford University, 1991.
J. W.
P. T.
T. V.
, and
, “
A Comparison of the Transient and Heated-Coating Methods for the Measurement of Local Heat Transfer Coefficients in a Pin Fin
ASME Journal of Heat Transfer
, Vol.
, pp.
Forest, A. E., “Engineering Predictions of Transitional Boundary Layers,” AGARD-CP-224, 1977.
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