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.

2 – chemical analysis in combustion chamber development

Abstract: Publisher Summary The development of combustion chambers for the aero-gas turbine is a complex problem. The ultimate objective is a combustion chamber, which burns hydrocarbon fuel in the minimum space, with the minimum weight of equipment and at a specific air flow with the minimum pressure drop. Combustion must be stable over a wide range of air-fuel ratios, so that sudden changes in throttle setting do not extinguish the flame. The energy released by combustion of the fuel is taken from the hot combustion gases by a turbine. It is difficult to obtain an even distribution of temperature at the turbine plane and the maximum temperature must be kept as low as possible. The walls of the flame-tube have to be maintained reasonably cool to ensure a good working life. With so many criteria to meet, the development of a combustion chamber is a lengthy business, made difficult by the fact that some factors are mutually incompatible, and the best compromise has to be obtained. Experimentation might be carried out at various levels of complexity. The ultimate stage is engine testing, which is costly. Where possible, the combustion system is broken down into small units, which might be development tested using a high pressure compressed air supply.

Materiau stratifie pour parois internes de chambre de combustion de moteur a turbine a gaz

Abstract: L'INVENTION CONCERNE UN MATERIAU STRATIFIE PERFORE DESTINE A FORMER LA PAROI INTERNE D'UNE CHAMBRE DE COMBUSTION DE MOTEUR A TURBINE A GAZ ET A EN AMELIORER LE REFROIDISSEMENT PAR CIRCULATION D'AIR REFRIGERANT A L'INTERIEUR DUDIT MATERIAU IL SE COMPOSE DE DEUX FEUILLES METALLIQUES ACCOLEES ENSEMBLE, L'UNE 30 DISPOSEE VERS LA REGION DE BASSE TEMPERATURE ET PERCEE DE PERFORATIONS D'ENTREE D'AIR 32, L'AUTRE 36 DISPOSEE VERS LA REGION DE HAUTE TEMPERATURE ET PERCEE D'UN PLUS GRAND NOMBRE DE PERFORATIONS DE SORTIE D'AIR 38 COMMUNIQUANT AVEC LES PREMIERES PAR DES CONDUITS 34 ET 40, RESPECTIVEMENT CREUSES DANS LES FACES ACCOLEES DES DEUX PLAQUES CE MATERIAU PERMET D'ELEVER LA PRESSION ET LA TEMPERATURE DE TRAVAIL DE LA CHAMBRE, DONC SON RENDEMENT THERMIQUE

Mould assembly for casting metal articles

Abstract: In a mould assembly for multiple castings each mould is fed from a source of molten metal through a thin slit the width of which lies in the range 1.25 mm to 0.25 mm. The cast articles can be easily removed from the runner and riser system after casting without a machining operation so that the casting moulds can be packed closer together and more castings can be produced from each mould assembly. The thin slit also acts as a filter. A particular mould assembly seen in FIG. 2 is cylindrical and comprises a plurality of wedge-shaped mould segments 2 having mould cavities 4 in abutting faces. A central runner passage 6 is formed when the mould segments are assembled and the metal flows into the mould cavities through narrow slits 10 in one edge of each mould. After casting and removal of the mould the narrow flashing formed in the slits can be easily broken to remove the cast articles from the metal formed in the central runner passage.