Film cooling performance by injection through discrete holes
Abstract
The present study includes film cooling measurements along a flat plate exposed to a main stream of air, with injection of a secondary air through discrete holes. Injection occurred through two different sets of hole configurations of 5 and 10 mm diameters, each arranged in a single row, spaced at two different distances, and producing two different injection angles, namely 30 and 45 deg to the horizontal, respectively. Experimental results are presented for the velocityprofiles, the temperature profiles, film cooling effectiveness, and the local heat transfer coefficient, given for two velocity ratios of the injected air velocity to the main stream velocity of 0.5 and 1, respectively. Comparisons are also made with some previously developed theoretical models for slot film cooling. The limitation of the application of such a theoretical model is emphasized.
- Publication:
-
5th International Symposium on Air Breathing Engines
- Pub Date:
- 1981
- Bibcode:
- 1981abe..symp...34E
- Keywords:
-
- Air Breathing Engines;
- Engine Design;
- Film Cooling;
- Flat Plates;
- Gas Injection;
- Holes (Mechanics);
- Perforated Plates;
- Air Intakes;
- Aircraft Engines;
- Heat Transfer Coefficients;
- Mathematical Models;
- Performance Prediction;
- Temperature Distribution;
- Velocity Distribution;
- Fluid Mechanics and Heat Transfer