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.

Resin matrices and their contribution to composite properties

Abstract: As a result of the increasing use of glass and carbon fibre reinforced plastics in aircraft structures, great emphasis is now placed on the choice of a suitable resin matrix for these demanding applications. In practice this choice is frequently a compromise between conflicting manufacturing, design and materials requirements, and is further complicated by the great range in chemical variety of available resin matrices. Uncertainty of quality in the manufactured composite and a failure to observe and report on fracture modes occurring during sample testing are among other factors that interfere with the establishment of a body of reliable experimental data. This paper considers the relation between matrix and composite properties from a number of viewpoints. Examples of materials' requirements for specific component applications are given and, finally, a matrix suitable for aerospace use and factors influencing its formulation is discussed.

Dissolving ceramic materials

Abstract: Ceramic core materials are selectively dissolved from light metal, e.g. Aluminium or light alloy, e.g. Aluminium alloy castings which are themselves susceptible to attack by caustic alkali solutions, by providing the core material with a substance containing Hydrogen donor group which is capable of producing nascent hydrogen and contacting the core with fused anhydrous caustic alkalis. By this means Silica cores can be removed from Aluminium alloy castings, or a ceramic containing a hydrogen donor group can be selectively dissolved from one that does not, e.g. a Silica disposable pattern from within an Alumina mould containing an integral Alumina core.

Combustion equipment for gas turbine engines

Abstract: Combustion equipment designed to reduce smoke levels and the production of nitrogen oxides has a fuel burner mounted in the upstream wall of a combustion chamber, the fuel burner comprising a central duct partially surrounded by an annular duct, each of the ducts having an array of swirl vanes at their upstream ends and fuel inlet apertures downstream of the respective arrays of swirl vanes. The fuel supply to each of the ducts can be controlled to apportion the fuel flow between the two ducts in dependence of an engine parameter, such as speed, so that at low speeds a majority of the fuel is injected into the annular duct while at higher engine speeds, a majority of the fuel is injected into the central duct.

Bladed member for a fluid flow machine

Abstract: A bladed member for a fluid flow machine comprises a plurality of angularly spaced-apart aerofoil-shaped blades whose root portions are pivotally mounted in a common blade support member, resilient means being provided for resiliently urging the blades towards predetermined relative angular positions.

Method for eliminating, or minimizing the effects of, defects in materials

Abstract: A method is described for the manufacture of articles in defect immunized materials in which the defects are eliminated, or broken up and oriented in such manner as to minimize their harmful effects on the article. Referring to FIG. 1e, a rotor disc for a gas turbine engine is formed to an approximate shape by stacking together "sticks" 5 of material in an evacuated container and bonding them together by a hot isostatic pressing process. The "sticks" 5 are produced by extruding a starting body, for example, of powder material, to produce an elongation of up to twenty times and then cutting them to the appropriate length. By this means any non-metallic inclusions in the powder are broken up, inspection of the sticks and rejection of defective ones becomes easier, and the sticks can be oriented so that the effects of any remaining defects can be minimized.