Rolls-Royce Holdings

About: Rolls-Royce Holdings is a company organization based out in Derby, United Kingdom. It is known for research contribution in the topics: Turbine & Gas compressor. The organization has 4027 authors who have published 6305 publications receiving 80517 citations. The organization is also known as: Rolls-Royce Holdings plc.

Application of Computational Fluid Dynamics to Turbine Disk Cavities

Abstract: A CFD code for the prediction of flow and heat transfer in rotating turbine disc cavities is described and its capabilities demonstrated through comparison with available experimental data. Application of the method to configurations typically found in aeroengine gas turbine is illustrated and discussed. The code employs boundary-fitted coordinates and uses the κ-e turbulence model with alternative near-wall treatments. The wall function approach and a one-equation near-wall model are compared and it is shown that there are particular limitations in the use of wall functions at low rotational Reynolds number.

Gas turbine engine fuel system

Abstract: A gas turbine engine fuel system comprises a main fuel manifold and starter fuel manifold which direct fuel into the combustion apparatus of a gas turbine engine. During normal engine operation, fuel flow to the starter manifold is prevented by a solenoid valve. Air from within the combustion apparatus then flows back through the starter manifold and into a fuel drains system of the engine to purge the starter manifold of fuel. This purging of fuel in the starter manifold engine operation prevents the undesirable leakage of fuel into the combustion apparatus from the starter manifold.

Additive layer manufacturing method

Abstract: An additive layer manufacturing method includes the steps of: a) laying down powder layer on powder bed, and b) focussing energy on an area of powder layer to fuse area of powder layer and thereby form a cross-section of the product; wherein steps a) and b) are repeated to form successive cross-sections of product, and wherein at least one of said steps b) involves focussing energy on an area of respective powder layer which is unsupported by a previously formed cross-section of product to thereby form a downwardly facing surface of product. Method is at least some of said successive steps b) involve focussing energy on a support area of respective powder layer, to fuse support area and thereby form successive cross-sections of a support pin within powder bed, support pin extending outwardly from downwardly facing surface of product when it is formed, so as to support downwardly facing surface.

Seal and a method of manufacturing a seal

Abstract: A seal ( 48 ) between a compressor rotor blade ( 26 ) and compressor casing ( 28 ) comprises an abradable structure ( 59 ) on the compressor casing ( 28 ). The abradable structure ( 59 ) comprises a metallic foam ( 60 ) having pores ( 66, 68 ). The metallic foam ( 60 ) has a first a region ( 62 ) and a second region ( 64 ). The first region ( 62 ) of the metallic foam ( 60 ) is arranged adjacent to the compressor casing ( 28 ) and the second region ( 64 ) of the metallic foam ( 60 ) is spaced from the compressor casing ( 28 ) by the first region ( 62 ) of the metallic foam ( 60 ). The pores ( 68 ) of the second region ( 64 ) of the metallic foam ( 60 ) contain an abradable material ( 70 ) and the pores ( 66 ) of the first region ( 62 ) of the metallic foam ( 60 ) do not contain an abradable material.

Electrical generation arrangement for an aircraft

Abstract: This invention relates to a multi-spool gas turbine engine, including: a first generator for providing electrical power to an electrical system, the generator being driveably connected to a first spool; a second generator for providing electrical power to the electrical system, the generator being driveably connected to a second spool; a disconnection device for disconnecting the second generator from the second spool; and, a controller configured to selectively operate the disconnection device under predetermined powered engine conditions.