Unsteady heat transfer measurements on a rotating gas turbine blade
Abstract
This paper presents heat transfer measurements made on the rotor blade of a full-stage model turbine operating at engine representative conditions. The measurement technique of mounting thin film heat transfer gauges on enamel-coated turbine blades enables the heat transfer rate to be measured across a frequency range of dc to 100 KHz. A calibration experiment in which the gauge is pulsed with a laser beam is described in detail. The results are compared with data from a previous 2D simulation of wake-passing flow in the midheight section of the same blade. The mean heat transfer rate recorded in the two experiments shows reasonable agreement. Fluctuations in the unsteady heat transfer signal at nozzle-guide-vane passing frequency are seen at the same locations in data from both experiments. The magnitude of the fluctuations seen on the rotor are much smaller than those recorded in the 2D simulation. Frequency spectra and correlation analysis of heat transfer traces recorded on the rotor are also presented.
- Publication:
-
ASME, 35th International Gas Turbine and Aeroengine Congress and Exposition
- Pub Date:
- June 1990
- Bibcode:
- 1990gatu.confS....H
- Keywords:
-
- Gas Turbine Engines;
- Heat Measurement;
- Heat Transfer;
- Thermal Control Coatings;
- Turbine Blades;
- Guide Vanes;
- Heat Flux;
- Rotating Environments;
- Thermal Analysis;
- Fluid Mechanics and Heat Transfer