IGTC-34 Leakage Loss and Heat Transfer in High-Speed Rotating Labyrinth Seals : An Experimental Verification of Numerical Codes(Session B-4 HEAT TRANSFER IN GAS TURBINE COMPONENTS)
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概要
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Predictions and measurements have been performed to determine the effects of high rotational speeds on the leakage rate and the heat transfer in a staggered labyrinth seal. The study encompasses a wide range of Taylor numbers and Reynolds numbers. The experiments are an extension of our earlier measurements in highspeed rotating straight through labyrinth seals. Measurements under realistic conditions of 600K gas temperatures and pressure ratios of 2 were performed. Extensive care was taken in achieving positive clearance measurements and the data transfer from the rotating part of the seal, which are the most critical elements for a correct analysis. Continuous clearance control was attained by employing specially designed gauges, and the temperature measurements along the rotor were performed utilizing a high accuracy telemetric system. The labyrinth seal losses are described by a flow discharge coefficient. For the analysis of the heat transfer, the measured local heat transfer coefficient is derived from measured wall and gas temperatures utilizing a finite element program. In addition, mean heat transfer coefficients were calculated by averaging the local values. In order to ensure direct comparisons between the experimental and numerical investigations, identical flow and temperature conditions at the inlet of the seal were chosen. The flow field was calculated using the well known κ-ε- turbulence model and the stable upwind scheme, taking into account the rotating wall of the seal. For the prediction of the heat transfer, the measured temperature distribution at the cold sides of the seal components are used as boundar conditions. Heat transfer coefficients for the stator and the rotor are derived utilizing the well known Stanton analogy. Detailed pressure and velocity distributions in the labyrinth are presented. Numerically obtained heat transfer coefficients and loss parameters are verified by experiments.
著者
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Scherer Th.
Lehrstuhl Und Institut Fur Thermische Stromungsmaschinen Universitat Karlsruhe (t.h.)
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Waschka W.
Lehrstuhl und Institut fur Thermische Stromungsmaschinen Universitat Karlsruhe (T.H.)
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Wittig S.
Lehrstuhl und Institut fur Thermische Stromungsmaschinen Universitat Karlsruhe (T.H.)
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Kim S.
Lehrstuhl und Institut fur Thermische Stromungsmaschinen Universitat Karlsruhe (T.H.)
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Wittig S.
Lehrstuhl Und Institut Fur Thermische Stromungsmaschinen Universitat Karlsruhe (t. H.)
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