Effect of duct geometry on the heat transfer at the inlet edge of a blade cooled by an array of individual jets
Abstract
The effect of diameter and spacing of injection holes at the leading edge of an air-cooled blade on the heat transfer rate in the cooling ducts was studied experimentally using a variety of duct geometries and dimensions. The results are given in the form of plots of the Nusselt number vs Reynolds number. It is shown that the heat transfer rate in a cooled blade with longitudinal flow can be improved by injecting the coolant through an array of equidistant holes. The heat transfer rate averaged over the duct is affected primarily by the diameter of the injection holes; the effect of the duct height, on the other hand, is quite small, allowing the height to be varied as needed
- Publication:
-
Energetika
- Pub Date:
- June 1976
- Bibcode:
- 1976Engtk...8..139A
- Keywords:
-
- Air Cooling;
- Air Ducts;
- Gas Jets;
- Heat Transfer;
- Turbine Blades;
- Gas Injection;
- Nusselt Number;
- Reynolds Number;
- Fluid Mechanics and Heat Transfer