Turbine blade damper arrangement
A turbine blade damper arrangement in which a damper is positioned against the undersides of the platforms of adjacent turbine blades. In operation, the damper is centrifugally urged into engagement with the blade platforms to provide damping of relative movement between the blades. The damper and platform surfaces that it engages are of part-cylindrical configuration in order to minimize gas leakage paths between the damper and blade platforms.
1. A turbine blade damper arrangement for providing clamping between turbine blades, the arrangement including
a first, part cylindrical, contact surface, on a first circumferential side of each turbine blade, on an inner side of a turbine platform, and
a second, flat, inclined contact surface, on an opposite circumferential side of each turbine blade, on the circumferential side of an adjacent turbine platform,
the first contact surface being spaced from the second contact surface on an adjacent turbine blade, with a cylindrical axis of the first contact surface being substantially perpendicular to the second contact surface, and with the second contact surface being inclined away from the turbine radial direction; and
an elongate damper being located between each adjacent pair of turbine blade platforms, the damper including
a first, part cylindrical, engagement face engageable with the first contact surface, and
a second, flat, engagement face substantially perpendicular to the axis of the first engagement face, which second engagement face is engageable with the second contact surface on an adjacent turbine blade.
2. The arrangement according to claim 1 , wherein a gap is defined between adjacent turbine blades and is inclined away from the turbine radial direction.
3. The arrangement according to claim 1 , wherein the first contact surface on each turbine blade is formed by a part cylindrical groove.
4. The arrangement according to claim 1 , wherein the damper is provided on a pressure surface side of the turbine blades.
5. A gas turbine engine incorporating the turbine blade damper arrangements according to claim 1 .