Rolls-Royce Limited

About: Rolls-Royce Limited is a based out in . It is known for research contribution in the topics: Gas compressor & Rotor (electric). The organization has 624 authors who have published 623 publications receiving 10751 citations. The organization is also known as: Rolls Royce Limited.

Method and apparatus for controlling an electro-discharge machine tool

Abstract: A pair of complementary rod electrodes, one of which machines the other, is added to the circuitry of an electro-discharge machining system in which holes are drilled into existing passages in a workpiece, by other machining electrodes. When a machining electrode breaks into the passage, the resulting sharp increase in electrical potential thereacross is prevented from affecting the electrode advance control mechanism because the mechanism only senses the low potential across the continuously machining rod electrodes. Thus the electrode which machines the workpiece is prevented from rapidly traversing the passage and machining the opposite wall.

Method of producing a fibrous article

Abstract: The invention concerns a method of producing a fibrous article comprising employing at least one former at least one of whose surfaces is provided with substantially parallel recesses, laying a plurality of transverse lengths of fibrous material over the former so that the said transverse lengths extend transversely of the recesses and are spaced from each other longitudinally of the recesses, laying a longitudinal length of fibrous material in each said recess so that the said longitudinal lengths extend over the said transverse lengths and force respective portions of the latter into the recesses, forming at least one fibrous assembly having the shape of the respective said surface by bonding the transverse and longitudinal lengths together while the latter are on the former, and effecting relative separation between the said assembly and the former.

Magnetic seal with magnetic powder held in pole piece gap

Abstract: A seal for use in rotating machinery such as a gas turbine engine comprises two pole pieces attached to the engine casing and defining a gap in which a magnetic powder is held by a magnetic field generated by a permanent magnet, electro-magnet or a combination of the two. The non-magnetic fins of the adjacent rotor (e.g. turbine blades), extend into the gap and distort the magnetic field so that while there is a small clearance between the fin and the powder, this small clearance can be maintained approximately the same whatever the position of the fin in the gap. A seeding tube allows magnetic powder to be supplied to the gap to make good any loss of powder.

Method for removing aluminide coatings from nickel or cobalt base alloys

Abstract: A method of removing aluminium containing alloy coatings from nickel or cobalt base alloy substrates in which the coated substrate is immersed in an aqueous mixture of nitric and sulphamic acids until coating dissolution is complete. A solution containing 5 to 30% vol./vol. nitric acid and from 5 to 30% wt./vol. sulphamic acid is preferred.

Variable directionally silenced nozzle

Abstract: A nozzle assembly for a gas turbine engine intended to effect noise reduction when the aircraft carrying the nozzle is landing or taking off. The nozzle is variable between a cruise configuration in which it has a section which is circular or of regular polygonal form and a noise reduction configuration in which the nozzle dimension in one direction is substantially greater than that in a perpendicular direction. A pair of clamshell doors effect the change in configuration for the nozzle.