| 摘要 |
PURPOSE:To prevent generation of shock waves and to thereby reduce aerodynamic loss of a gas turbine, by employing sucn an arrangement that the flow rate of air ejected from a plurality of cooling air ejecting ports formed in side-by-side relationship along the span of a turbine blade is increased toward the root of the blade and decreased toward the tip of the blade. CONSTITUTION:Cooling air ejecting ports 5 formed in side-by-side relation-ship in the direction of the span of a turbine blade are designed such that the sectional area of the ports 5 is decreased toward the tip (upper end) of the blade and increased toward the root (lower end) of the blade. Since, by employing such an arragnement, a greater amount of cooling air is ejected from the root portion of the blade, the speed of air flow is prevented from exceeding Mach number 1, so that strong shock waves are not produced. Thus, it is enabled to reduce the aerodynamic loss due to shock waves. |
