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Acoustic treatment in an unducted area of a geared turbomachine
US9856745B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9856745-B2 |
| Application number | US-201213406712-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 28, 2012 |
| Priority date | Feb 28, 2012 |
| Publication date | Jan 2, 2018 |
| Grant date | Jan 2, 2018 |
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- Title
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Abstract
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An exemplary geared turbomachine assembly includes an acoustic treatment that is in an unducted area of a geared turbomachine.
First claim
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I claim: 1. A geared turbomachine assembly, comprising: an acoustic treatment that is in an unducted area of a geared turbomachine, wherein a portion of the acoustic treatment is axially aligned with a low-pressure turbine section of the geared turbomachine, wherein the acoustic treatment extends continuously from a ducted area to the portion that is axially aligned with the low-pressure turbine section of the geared turbomachine. 2. The geared turbomachine assembly of claim 1 , wherein the acoustic treatment forms a portion of a core engine cowl, wherein the acoustic treatment extends axially to an aftmost end of the core engine cowl. 3. The geared turbomachine assembly of claim 2 , wherein the acoustic treatment extends continuously from the ducted area to the aftmost end. 4. The geared turbomachine assembly of claim 2 , wherein the acoustic treatment forms a portion of the core engine cowl that provides a radially outer boundary of a core flowpath of the geared turbomachine. 5. The geared turbomachine assembly of claim 2 , wherein the acoustic treatment forms a portion of the core engine cowl that provides a radially inner boundary of a bypass flowpath of the geared turbomachine. 6. The geared turbomachine assembly of claim 2 , wherein the acoustic treatment comprises a perforated face sheet having an open area density that is from 4% to 30%. 7. The geared turbomachine assembly of claim 2 , wherein the acoustic treatment comprises a microperforated face sheet having apertures with a diameter that is less than 25 percent of a thickness of the microperforated face sheet. 8. The geared turbomachine assembly of claim 2 , wherein the geared turbomachine assembly has a fan pressure ratio less than 1.45. 9. The geared turbomachine assembly of claim 1 , wherein the acoustic treatment forms a portion of a core engine cowl that provides a radially outer boundary of a core engine flowpath of the geared turbomachine. 10. The geared turbomachine assembly of claim 1 , wherein the acoustic treatment forms a portion of a core engine cowl that provides a radially inner boundary of a bypass flowpath of the geared turbomachine. 11. The geared turbomachine assembly of claim 1 , wherein a portion of the acoustic treatment is axially aft a fan cowl of the geared turbomachine. 12. The geared turbomachine assembly of claim 1 , wherein the acoustic treatment extends continuously from the ducted area to an aftmost end of a core engine cowl. 13. The geared turbomachine assembly of claim 1 , wherein the acoustic treatment comprises a perforated face sheet having an open area density that is from 4% to 30%. 14. The geared turbomachine assembly of claim 1 , wherein the acoustic treatment comprises a microperforated face sheet having apertures with a diameter that is less than 25 percent of a thickness of the microperforated face sheet. 15. The geared turbomachine assembly of claim 1 , wherein the geared turbomachine assembly has a fan pressure ratio less than 1.45.
Assignees
Inventors
Classifications
- F02K1/827Primary
Sound absorbing structures or liners · CPC title
- F01D25/00Primary
Component parts, details, or accessories, not provided for in, or of interest apart from, other groups · CPC title
with front fan · CPC title
Heat or noise insulation (air intakes having provisions for noise suppression F02C7/045; turbine exhaust heads, chambers, or the like F01D25/30; silencing nozzles of jet-propulsion plants F02K1/00) · CPC title
as in toothed gearing · CPC title
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- What does patent US9856745B2 cover?
- An exemplary geared turbomachine assembly includes an acoustic treatment that is in an unducted area of a geared turbomachine.
- Who is the assignee on this patent?
- Ali Amr, United Technologies Corp
- What technology area does this patent fall under?
- Primary CPC classification F02K1/827. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jan 02 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).