| 摘要 |
<p>A rotary blade (32), such as a turbine blade for a gas turbine engine, has an aerofoil portion (38) with a tip (40) partly shrouded by winglets (42). A gutter (50) extends across the radially outer face of the tip (40) to leave upstands (52). Cooling air feed galleries (58) are drilled into each upstand (52), from the trailing edge (64), toward the upper end of a cooling air feed void (56), which is spaced from the trailing edge (64). Cooling passages (60) are drilled from the winglet edges (44) to the gallery (58). Cooling air supplied through the void (46) passes along the gallery (58), through the passages (60) and leaves the blade (32) at the cooling holes (62). This allows cooling to be provided near the trailing edge of the tip (40) without requiring the geometry around the trailing edge to be thickened to accommodate a cooling air void.
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