An Advanced Method of Processing Liquid Crystal Video Signals From Transient Heat Transfer Experiments

Author:

Wang Z.1,Ireland P. T.1,Jones T. V.1

Affiliation:

1. Department of Engineering Science, University of Oxford, Oxford, United Kingdom

Abstract

A new method of processing the liquid crystal color change data obtained from transient heat transfer experiments is presented. The approach uses the full-intensity history recorded during an experiment to obtain an accurate measurement of the surface heat transfer coefficient at selected pixels. Results are presented for a model of a turbine blade cooling passage with combined ribs and film cooling holes. The implementation of the technique and the advantages to be gained from its application are discussed.

Publisher

ASME International

Subject

Mechanical Engineering

Reference13 articles.

1. Akino, N., Kunugi, T., Ueda, M., and Kurosawa, X., 1988, “Liquid Crystal Thermometry Based on Automatic Color Evaluation and Applications to Measure Turbulent Heat Transfer,” Transport Phenomena in Turbulent Flows, Hemisphere, Washington, DC, pp. 807–820.

2. Baughn J. W. , IrelandP. T., JonesT. V., and SanieiN., 1989, “A Comparison of the Transient and Heated-Coating Methods for the Measurement of Local Heat Transfer Coefficients on a Pin Fin,” ASME Journal of Heat Transfer, Vol. 111, pp. 877–881.

3. Camci C. , KimK., and HippensteeleS. A., 1992, “A New Hue Capturing Technique for Quantitative Interpretation of Liquid Crystal Images Used in Convective Heat Transfer Studies,” ASME JOURNAL OF TURBOMACHINERY, Vol. 114, pp. 765–775.

4. Clifford, R. J., Jones, T. V., and Dunne, S. T., 1983, “Techniques for Obtaining Detailed Heat Transfer Coefficient Measurements Within Gas Turbine Blade and Vane Cooling Passages,” ASME Paper No. 83-GT-58.

5. Davenport, R., 1989, “Innovative Use of Thermochromic Liquid Crystals for Turbine Blade Internal Cooling Passage Flow Visualisation and Heat Transfer Measurements,” Proceedings of European Propulsion Forum, Modern Techniques and Developments in Engine and Component Testing, Royal Aeronautical Society, 16.1–16.5

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