Development of the highly loaded axial flow turbine airfoils, making use of the improved inverse channel flow design method
Abstract
To reduce the number of the turbine airfoils or the solidity as far as possible without increasing energy loss, a study of highly loaded turbine airfoils was conducted. These airfoils were designed for the typical velocity diagrams of the first and second stages of a jet engine low pressure turbine. With regard to the design procedures, an improved inverse method, and also a boundary layer analysis technique were employed to optimize the airfoil shapes. These airfoils, and state-of-the-art aft loaded conventional airfoils designed for almost equivalent velocity diagrams were tested in the high speed cascade wind tunnel. The airfoils showed lower kinetic energy loss coefficient characteristics and wider useful incidence ranges over the wider range extended to the high subsonic regime compared with the aft loaded ones, in spite of their higher loading. In addition to some main parts of the design procedures, theoretical and experimental results are discussed.
- Publication:
-
3rd NAL Symposium on Aircraft Computational Aerodynamics
- Pub Date:
- November 1985
- Bibcode:
- 1985acae.proc...77H
- Keywords:
-
- Airfoils;
- Design Analysis;
- Energy Dissipation;
- Loads (Forces);
- Boundary Layers;
- Optimization;
- Turbine Engines;
- Wind Tunnel Tests;
- Fluid Mechanics and Heat Transfer