Blades

摘要

A turbine blade for a gas turbine engine has an aerofoil portion extending from a root to a tip. The tip carries winglets. A gutter extends across the tip to entrain gas leaking around the tip (over tip leakage). The aerofoil portion has a mean camber line and the gutter has a center line. In the examples described, the conditions that (a) the mean camber line and the centre line coincide at the exit when viewed from the tip towards the root, and (b) the mean camber line and the center line are parallel at the exit when viewed as aforesaid, are not both fulfilled.

主权项

1. A rotor blade for use in a turbine engine, the rotor blade comprising:
an aerofoil portion including:
a leading edge,a trailing edge,a tip having winglets configured to project laterally outward at a radially outer end of: (1) a suction face of the aerofoil portion, and (2) a pressure face of the aerofoil portion,a root, andat least one gutter extending across the tip to an exit in the region of the trailing edge, the aerofoil portion having a mean camber line, and the gutter having a centre line when viewed from the tip towards the root, and the rotor blade being configured such that: (i) the centre line is offset from the mean camber line in the direction of the suction face of the aerofoil portion, (ii) the mean camber line and the centre line coincide at the exit when viewed from the tip towards the root, and (iii) the mean camber line and the centre line arc not parallel at the exit when viewed from the tip towards the root.