| 摘要 |
<p>This invention decreases temperature gradients in the walls of stationary and rotating blades of gas turbines by placing a thin graphite foil with directed thermal conductivity on the surface of coolant passages within the blade and/or outer surface of the blade. The overall effect could be reinforced by placing a thin layer of a metal with high thermal conductivity between the graphite foil and the wall of the blade. The graphite foil can be protected from oxidation by placing a thin metal foil on its surface, along with aspirating the air, and gas tightly connecting the metal foil with the wall of the blade. It is also possible that the graphite foil itself contains a protective overlayer. The bending of graphite foils in rotating blades can be prevented by artificial roughness of the surface, which is otherwise used for the convective heat transfer enhancement, and/or by cementing, and/or by the use of graphite foils reinforced by fibers.</p> |
