Rolls-royce Corporation

Christopher Paul Heason

Gavin J Baxter

Alistair Buchanan

A gas shield arrangement for a gas turbine engine includes a first gas shield that is arranged to cover an inlet of a gas flow path of the gas turbine engine and a second gas shield that is arranged to cover a first outlet of the gas flow path of the gas turbine engine. The gas shield arrangement further includes a reservoir that holds fluid and a pump that pumps the fluid from the reservoir to one of a first valve and a second valve and that returns at least some of the pumped fluid to the reservoir from the other of the first valve and the second valve.

Gas shielding arrangements for gas turbine engines

A method of repairing a metallic component (formed from a first material) by powder feeding laser deposition, comprises the step of depositing a plurality of first repair layers onto a repair surface of the component to form a first repair zone, the first of the plurality of first repair layers comprising a mixture of A/B by weight of the first material and a second material, each nth successive one of the plurality of first repair layers comprising a change in the proportion of the second material in the mixture, the last of the plurality of first repair layers comprising a mixture of C/D by weight of the first material and the second material.

Additive layer repair of a metallic component

Method for determining an adaptive tool path: provides an aerofoil with deposition plane; determines deposition plane points corresponding to leading and trailing edges and circle center constrained by suction and pressure surfaces at their greatest distance apart; determines circle center point edge position passing through deposition plane points; determines trailing and leading edge reference lines extending from the circle center point through trailing and leading edge points, respectively and mid-reference line(s) extending from the circle center point through mid-reference point(s) between leading and trailing edge points; trims and determines each mid reference line to the bounds of the suction and pressure surfaces; applies an adaptive factor to each mid reference line providing an adaptive point for each mid-reference line; determines an spline extending through the leading and trailing edge points and each adaptive point; and traverses a tool along the spline or offset path from the spline by a factor.

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Chesterfield, United Kingdom

Christopher Paul Heason