Prediction of transient temperatures for an air-cooled rotating disc
Abstract
The numerical solution of Fourier's conduction equation is used to compute the transient temperature distribution in a rotating disc. The convective boundary conditions for the disc surfaces are based on simple formulae obtained from the solutions of the boundary-layer equations, and the computed surface temperatures are compared with measurements made on a rotating-disc rig. Free-disc tests, at rotational Reynolds numbers up to Re sub phi = 2.5 x 10(6), are used to provide a datum from which to judge the numerical method. Although the numerical solution tends to overestimate the cooling rate of the heated free disc at high Reynolds numbers, the agreement between computed and measured temperatures is considered reasonable. Rotating-cavity tests, in which a heated disc is cooled by a radial outflow of air, are used to examine the suitability of the simple convective boundary conditions. As the computed temperatures show reasonable agreement with the measured values, it is suggested that the proposed formulae for convection in a rotating cavity might be useful for design purposes.
- Publication:
-
In AGARD Heat Transfer and Cooling in Gas Turbines 14 p (SEE N86-29823 21-07
- Pub Date:
- September 1985
- Bibcode:
- 1985htcg.agarR....L
- Keywords:
-
- Air Cooling;
- Conductive Heat Transfer;
- Gas Turbines;
- Rotating Disks;
- Surface Temperature;
- Temperature Distribution;
- Boundary Conditions;
- Boundary Layer Equations;
- Ekman Layer;
- Mathematical Models;
- Nusselt Number;
- Reynolds Number;
- Fluid Mechanics and Heat Transfer