Seal

A seal for sealing between two component parts, the seal permitting a leakage flow of fluid from an upstream side of the seal to a downstream side of the seal, the seal comprising:

• a jet-producing formation which produces one or more fluid jets at a most downstream side of the seal that impinge on and thereby restrict the leakage flow as the flow exits the seal, wherein
• the jet producing formation is formed as a fluid exit hole or holes disposed in a component of the seal,
• the component of the seal is a backing plate, a cover plate or a clamping ring, and
• the backing plate, the cover plate or the clamping ring includes at least one fluid exit hole disposed in a substantially axial and radial direction relative to the flow of the fluid.