Spelstyrning för turbinen vid en gasturbinmotor

摘要

The axial flow turbine includes a number of internally air cooled turbine blades each having a tip section mounted adjacent the shroud and defining with it a gap that is susceptible of leaking engine working medium. Each internally cooled blade has an airfoil surface exposed to the engine working medium defining a pressure surface and a suction surface. A device minimises the leakage by providing a buffer zone in the gap. The device includes an orifice located in the tip section adjacent the pressure surface. The orifice is skewed relative to the rotation axis of the blade for leading air from internally of the blade into the gap toward the pressure side of the blades. The stream of air discharging from the orifice defines a buffer zone.