Measurement and prediction of heat transfer from compressor discs with a radial inflow of cooling air
Abstract
An internal theory is used to model the flow, and predict heat transfer rates, for corotating compressor disks with a superposed radial inflow of air. Measurements of heat transfer are also made, both in an experimental rig and in an engine. The flow structure comprises source and sink regions, Ekman-type layers and an inviscid central core. Entrainment occurs in the source region, the fluid being distributed into the two nonentraining Ekman-type layers. Fluid leaves the cavity via the sink region. The integral model is validated against the experimental data, although there are some uncertainties in modeling the exact thermal conditions of the experiment. The magnitude of the Nusselt numbers is affected by the rotational Reynolds number and dimensionless flowrate; the maximum value of Nu is found to occur near the edge of the source region. The heat transfer measurements using the engine data show acceptable agreement with theory and experiment.
- Publication:
-
36th ASME, International Gas Turbine and Aeroengine Congress and Exposition
- Pub Date:
- June 1991
- Bibcode:
- 1991gatu.confQ....F
- Keywords:
-
- Air Cooling;
- Compressor Rotors;
- Heat Transfer;
- Rotating Disks;
- Corotation;
- Flow Measurement;
- Inlet Flow;
- Radial Flow;
- Turbine Wheels;
- Fluid Mechanics and Heat Transfer