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EFFECT OF ROTATION ON THE CYCLONE COOLING METHOD MASS TRANSFER MEASUREMENTS

DOI: 10.1615/ICHMT.2009.HeatTransfGasTurbSyst.440
17 pages

Nils Winter
Institute of Gas Turbines and Aerospace Propulsion, Technische Universitüt Darmstadt, 64287 Darmstadt, Germany

Heinz-Peter Schiffer
Institute of Gas Turbines and Aerospace Propulsion, Technische Universität Darmstadt, 64287 Darmstadt, Germany

要約

The stator and rotor blades of a high-pressure turbine are highly thermally loaded. The cooling air for the blades is bled off the compressor, i. e. not available for the burning process. Therefore, it is important to use as little coolant as possible and to augment the heat transfer in the cooling channels of the turbine blades. This publication reports on mass transfer measurements in a cylindrical model of a blade-cooling channel with a new cooling technique called cyclone cooling. This means that a swirling component is superimposed on the main flow. The investigations compare experiments with and without system rotation and give results for the question of whether rotation influences the mass transfer in the same way as it does without swirling flow. The well-known naphthalene sublimation technique is used to examine the mass transfer, based on the analogy of heat and mass transfer. Important results are that the swirl stabilizes the flow in the channel and so the development of a suction and pressure side is significantly reduced. With increasing swirl, the mass transfer increases.

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