High temperature composite inner fixed structure

Patent metadata

Field	Value
Publication number	US-2016265383-A1
Application number	US-201514635768-A
Country	US
Kind code	A1
Filing date	Mar 2, 2015
Priority date	Mar 2, 2015
Publication date	Sep 15, 2016
Grant date	—

Abstract

An inner fixed structure for an aircraft nacelle may comprise a nanoreinforced polyimide composite skin. The nanomaterials may increase thermal conductivity and decrease microcracking in the inner fixed structure. The inner fixed structure may comprise an inner polyimide composite skin, an acoustic core, and an outer polyimide composite skin. The inner fixed structure may be blanketless.

First claim

We claim:

1 . An inner fixed structure of a thrust reverser for an aircraft nacelle comprising:
a core; a first polyimide composite skin coupled to a first side of the core, wherein the first polyimide composite skin comprises nanomaterials; and a second polyimide composite skin coupled to a second side of the core, wherein the second polyimide composite skin comprises nanomaterials.

2 . The inner fixed structure of claim 1 , wherein the inner fixed structure is a blanketless inner fixed structure.

3 . The inner fixed structure of claim 1 , wherein the nanomaterials comprise of at least one of carbon nanotubes, carbon nanofibers, or graphene nanoplatelets.

4 . The inner fixed structure of claim 1 , wherein at least one of the first polyimide composite skin or the second polyimide composite skin is coupled to the core with an adhesive film comprising nanomaterials.

5 . The inner fixed structure of claim 1 , wherein the nanomaterials increase a thermal conductivity of the first polyimide composite skin.

6 . The inner fixed structure of claim 1 , wherein the nanomaterials comprise carbon nanotubes or nanofibers, and wherein the nanomaterials are grown on carbon fibers in at least one of the first polyimide composite skin or the second polyimide composite skin.

7 . The inner fixed structure of claim 1 , wherein the first polyimide composite skin comprises a nanoreinforced polyimide surface film.

8 . The inner fixed structure of claim 1 , wherein the nanomaterials are distributed in a polyimide resin matrix in at least one of the first polyimide composite skin or the second polyimide composite skin.

9 . The inner fixed structure of claim 1 , further comprising a thermal barrier layer coupled to the second polyimide composite skin.

10 . A nacelle comprising a thrust reverser with a composite inner fixed structure, wherein the composite inner fixed structure comprises:
an acoustic core; a first polyimide composite skin comprising nanomaterials configured to increase a thermal conductivity of the first polyimide composite skin and increase resistance to microcracking of the first polyimide composite skin; and a second polyimide composite skin comprising nanomaterials configured to increase a thermal conductivity of the second polyimide composite skin and increase resistance to microcracking of the second polyimide composite skin.

11 . The nacelle of claim 10 , further comprising a thermal barrier layer coupled to the second polyimide composite skin.

12 . The nacelle of claim 10 , wherein the composite inner fixed structure is a blanketless inner fixed structure.

13 . The nacelle of claim 10 , wherein the nanomaterials are grown on carbon fibers in the first polyimide composite skin.

14 . The nacelle of claim 10 , wherein the nanomaterials are dispersed in a polyimide resin matrix in the first polyimide composite skin.

15 . The nacelle of claim 10 , wherein the acoustic core comprises at least one of aluminum, titanium, nickel, or stainless steel.

16 . The nacelle of claim 10 , wherein the acoustic core is coated or clad by a conductive coating to increase the thermal conductivity of the acoustic core.

17 . The nacelle of claim 10 , wherein the first polyimide composite skin comprises a plurality of perforated holes and is coupled to the acoustic core to attenuate noise from an aircraft engine.

Assignees

• Rohr Inc

Inventors

• Pujar Vijay V
• Kruckenberg Teresa

Classifications

• F02K1/78

  Other construction of jet pipes · CPC title

• F05D2300/603

  Composites; e.g. fibre-reinforced · CPC title

• F01D25/145

  Thermally insulated casings · CPC title

• F05D2300/434

  Polyimides, e.g. AURUM · CPC title

• F05D2240/14

  Casings or housings protecting or supporting assemblies within · CPC title