Abstract
The effects of injection rate and strength of curvature on film cooling performance of gas injected through a row of holes on a convex surface is studied. Comparisons are made to film cooling of concave and flat surfaces. Three different relative strengths of curvature (ratio of radius of curvature to radius of injection hole), two density ratios (0.95 and 2.0), and a wide range of blowing rates (0.3 to 2.7) are considered. A foreign gas injection technique (mass transfer analogy) is used. The strength of curvature was controlled by varying the injection hole diameter. At low blowing rates, film cooling is more effective on the convex surface than on a flat or a concave surface. The cross stream pressure gradient present in curved flows tends to push the jet into the convex wall. As the injection rate is increased, normal and tangential jet momentum promote lift-off from the convex surface, thereby lowering performance. In contrast, previous studies show that on a concave surface, tangential jet momentum, flow instabilities, and blockage improve performance on a concave surface as blowing rate is increased.
| Original language | English (US) |
|---|---|
| Title of host publication | Heat Transfer; Electric Power; Industrial and Cogeneration |
| Publisher | American Society of Mechanical Engineers (ASME) |
| ISBN (Electronic) | 9780791879078 |
| DOIs | |
| State | Published - 1990 |
| Event | ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition, GT 1990 - Brussels, Belgium Duration: Jun 11 1990 → Jun 14 1990 |
Publication series
| Name | Proceedings of the ASME Turbo Expo |
|---|---|
| Volume | 4 |
Other
| Other | ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition, GT 1990 |
|---|---|
| Country/Territory | Belgium |
| City | Brussels |
| Period | 6/11/90 → 6/14/90 |
Bibliographical note
Funding Information:The research reported herein was conducted with the support of the Air Force Office of Scientific Research (Contract Number F49620-