Turbomachine with low noise emissions for aircraft

• US 20050060983A1
• Filed: 08/10/2004
• Published: 03/24/2005
• Est. Priority Date: 08/18/2003
• Status: Active Grant

• Current Assignee: Safran Aircraft Engine Company
• Original Assignee: Snecma Moteurs
• Inventors: Lardellier, Alain
• Granted Patent: US 7,237,378 B2
• Time in Patent Office: Days
• US Class Current: 60/226.100
• CPC Class Codes: F02K 1/48 Corrugated nozzles
• CPC Class Codes: F02K 3/06 with front fan
• CPC Class Codes: F02K 3/105 Heating the by-pass flow
• CPC Class Codes: F05D 2260/96 Preventing, counteracting or reducing vibration or noise
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

The invention relates to a turbomachine (1) for an aircraft comprising a gas generator (4) designed such that hot gases are ejected from a combustion chamber (28) towards the upstream side of the turbomachine, and also comprising a plurality of hollow mixer struts (40) connected to an output (36) from the gas generator through which hot gases can pass, each mixer strut comprising an output mixer portion (40c) located inside the annular fan duct (8) so as to mix the secondary air and the hot gases ejected by these output mixer portions towards the downstream side of the turbomachine.

Claims

1. Turbomachine for an aircraft comprising a gas generator with a combustion chamber and driving at least one fan, said turbomachine being provided with an annular fan duct through which secondary air circulates from the upstream side towards the downstream side of the turbomachine, characterised in that the gas generator is designed such that hot gases are ejected from the combustion chamber towards the upstream side of the turbomachine, and in that the turbomachine also comprises a plurality of hollow mixer struts connected to an output from the gas generator through which hot gases can pass, each mixer strut comprising an output mixer portion located inside the annular fan duct so as to mix the secondary air and the hot gases ejected by these output mixer portions towards the downstream side of the turbomachine.

2. Turbomachine according to claim 1, characterised in that the gas generator is a twin-shaft gas generator.

3. Turbomachine according to claim 2, characterised in that the twin-shaft gas generator comprises a low pressure compressor through which combustion air passes from the upstream side towards the downstream side, a high pressure compressor through which combustion air passes from the downstream side towards the upstream side, the combustion chamber, and a high pressure turbine and a low pressure turbine, with hot gases passing through each in the direction from the downstream side towards the upstream side of the turbomachine.

4. Turbomachine according to claim 3, characterised in that the high pressure turbine drives the high pressure compressor, and in that the low pressure turbine drives the low pressure compressor and each of the turbomachine fans.

5. Turbomachine according to claim 1, characterised in that it is provided with a single fan.

6. Turbomachine as claimed in claim 1, characterised in that it is provided with two counter-rotating fans.

7. Turbomachine as claimed in claim 1, characterised in that it comprises a noise suppression structure surrounding the gas generator, said noise suppression structure delimiting the inner part of the annular fan duct and being closed at the back of the turbomachine.

8. Turbomachine as claimed in claim 1, characterised in that each mixer strut is provided with an input portion through which hot gases pass in the direction from the downstream side towards the upstream side, with the output mixer portion on the inside of the annular fan duct and through which these same hot gases pass in the direction from the upstream side to the downstream side, the input portion and the output portion being connected through a cranked portion.

9. Turbomachine according to claim 8, characterised in that the output mixer portion of each mixer strut is approximately in the shape of a lobed mixer.

10. Turbomachine according to claim 8 or claim 9, characterised in that the output mixer portions of the mixer struts are uniformly spaced inside the annular fan duct.