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US 2013/0219922 A1Published application
Geared gas turbine engine with reduced fan noise
OwnerJonathan Gilson, Bruce L. Morin +3inventors
InventorsJonathan Gilson, Bruce L. Morin, Ramons A. Reba, David A. Topol, Wesley K. Lord
Life of this patent
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Abstract
A fan section for a gas turbine engine has a fan rotor with a plurality of fan blades. A plurality of exit guide vanes are positioned to be downstream of the fan rotor. The fan rotor is driven through a gear reduction relative to a turbine section. The exit guide vanes are desired to address resultant sound from interaction of wakes from the fan blades across exit guide vanes. A gas turbine engine incorporating a fan section is also disclosed.
Claims20
A fan section for use in a gas turbine engine comprising:
- a fan rotor having a plurality of fan blades;
- a plurality of exit guide vanes positioned to be downstream of said fan rotor, said fan rotor being driven through a gear reduction;
- and
- a first ratio of a number of exit guide vanes to a number of fan blades being between about 0.8 and about 2.5.
1 more element
A gas turbine engine comprising:
- a fan having a rotor with fan blades;
- a compression section including a first compressor section and a second compressor section;
- a combustion section;
- a turbine section including a first turbine section associated with said first compressor section, and a second turbine section associated with said second compressor section, and said first turbine section rotating at a higher speed than said second turbine section, and said second turbine section driving said fan rotor and said second compressor section, with a gear reduction positioned to reduce a speed of said fan rotor relative to a speed of said second compressor section;
- a plurality of exit guide vanes positioned downstream of said fan rotor;
- and
- a ratio of the number of exit guide vanes to the number of fan blades being below a critical value such that there is the potential for noise to be “cut-on” and said exit guide vanes being provided with an acoustic feature to address resultant sound from interaction of wakes from said fan blades across said exit guide vanes.
4 more elements
Dependencies are inferred from the claim text.