摘要:
A propeller blade retention arrangement (30) having a propeller blade comprising in radial sequence an aerofoil portion (32), a shank portion (35) and a root portion (36). The root portion having first cross-sectional area (38) close to the shank portion and second cross-sectional area (40) at the end distal to the aerofoil portion, wherein the second cross-sectional area is greater than the first cross-sectional area. At least two cheeks (42)each having an inner surface arranged to abut the root portion, an outer surface that is threaded and edge surfaces that abut another of the at least two cheeks; wherein the at least two cheeks are arranged to surround the root portion in circumferential abutment. A collar (44) having a threaded inner surface arranged to threadingly engage the outer surfaces of the at least two cheeks.
摘要:
A propeller assembly (100) comprises two or more blade elements (102) each comprising two or more blade element portions (120) arranged sequentially radially along the blade element (102). Each of the two or more blade element portions (120) that are radially equipositioned along corresponding ones of the two or more blade elements (102) together form a blade element portion array (130). Each of the two or more blade element portions (120) comprise at least one heating element (140) with each one of the at least one heating elements that is located in a correspondingly radially positioned blade element portion (120) being connected to one another to form a heating element array (150). The two or more heating element arrays (152, 154, 156) are adapted to sequentially heat respective ones of the two or more blade element portion arrays (130) so as to de-ice the blade elements.
摘要:
There is provided a method (1000) of operating a gas turbine engine (10). The gas turbine engine (10) comprises a combustor (16) having a plurality of fuel spray nozzles (403, 404) and a fuel system arranged to provide fuel to the combustor (16). The fuel system comprises: a fuel pump (904); a fuel distributing valve (909) downstream of the fuel pump (904) arranged to distribute fuel to the plurality of fuel spray nozzles (403, 404) and bias fuel flow to the nozzles (403, 404) such that a first subset (403) of the plurality of fuel spray nozzles (403, 404) receives more fuel than a second subset (404) of the plurality of fuel spray nozzles (403, 404); and a fuel-oil heat exchanger (903). The method (1000) comprises providing a fuel to the combustor (16) and transferring heat from oil to the fuel in the fuel-oil heat exchanger (903) before the fuel enters the combustor (16) so as to lower a viscosity of the fuel to 0.58 mm2/s or lower on entry to the combustor (16) at cruise conditions. Also provided is a gas turbine engine (10) for an aircraft.
摘要:
There is provided a method (1000) of operating a gas turbine engine (10). The gas turbine engine (10) comprises a staged combustor (16) comprising an arrangement of fuel spray nozzles (403, 404) in which fuel flow is biased to a subset of the nozzles (403, 404) adjacent one or more ignitors (405) during a re-light procedure. The method (1000) comprises providing fuel (1001) to the combustor (16) having a calorific value of at least 43.5 MJ/kg. Also disclosed is a gas turbine engine (10).