An experimental investigation of a gas turbine disk cooling system
Abstract
The results of an experimental study of the cooling of a model disk similar to an engine disk are compared with the results obtained by three-dimensional finite difference computation, and it is reconfirmed that the determination of cooling air temperature is one of the most important data for predicting the disk temperature. The minimum cooling air flow rate necessary to prevent ingress of external hot gas is determined by the fluctuation of cooling air temperature inside the wheel space with the external axial hot gas flow for values of the rotational Reynolds number of 0-6.5 million. The effect of rotational speed on the minimum cooling air flow rate is found to be negligible, and it is shown that the determination of the ingress of hot gas using the pressure difference criterion underestimates the minimum cooling air flow rate.
- Publication:
-
28th International Gas Turbine Conference and Exhibit
- Pub Date:
- March 1983
- Bibcode:
- 1983gatu.conf.....K
- Keywords:
-
- Cooling Systems;
- Finite Difference Theory;
- Gas Turbines;
- Turbine Wheels;
- Air Flow;
- Flow Velocity;
- Heat Transfer;
- Reynolds Number;
- Temperature Effects;
- Fluid Mechanics and Heat Transfer