Mixer assembly group for a turbofan engine

Patent metadata

Field	Value
Publication number	US-10995698-B2
Application number	US-201715696619-A
Country	US
Kind code	B2
Filing date	Sep 6, 2017
Priority date	Sep 7, 2016
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A mixer assembly group for a turbofan engine, having a primary flow channel extending along a central axis of the turbofan engine and a secondary flow channel. The mixer assembly group includes a mixer for guiding a first fluid flow from the primary flow channel and a second fluid flow from the secondary flow channel in the direction of an exhaust of the turbofan engine, as well as for intermixing the first and second fluid flows, and a connection appliance, which has at least one connection component that is fixated at the mixer and by means of which the mixer assembly group is to be fixated at two different first and second engine components of the turbofan engine, with are subject to operating temperatures of different heights during operation of the turbofan engine.

First claim

The invention claimed is:

1. A mixer assembly group for a turbofan engine comprising:
a primary flow channel extending along a central axis of the turbofan engine;
a secondary flow channel;
a first engine component;
a second engine component with a different operation temperature than the first engine component during operation of the turbofan engine; and
a mixer for guiding a first fluid flow from the primary flow channel and a second fluid flow from the secondary flow channel in a direction of an exhaust of the turbofan engine, as well as for intermixing the first fluid flow and the second fluid flow;
a connection appliance by which the mixer is connected to the first engine component and the second engine component, wherein the connection appliance includes:
a V-shaped connector with a first leg, a second leg, and a base that connects the first leg and the second leg, wherein the base is attached to the mixer at a first attachment location and wherein the first leg is attached to the first engine component at a second attachment location for attaching the mixer to the first engine component;
a second connector, wherein the second leg of the V-shaped connector is attached only to the second connector with respect to the first engine component, the second engine component, and the second connector; and
wherein the second connector is attached at a third attachment location for attaching the mixer to the second engine component;
wherein the first attachment location, the second attachment location and the third attachment location are axially offset with respect to one another regarding the central axis of the turbofan engine;
wherein the mixer is supported in a radially displaceable manner relative to the first engine component as well as relative to the second engine component with respect to the central axis of the turbofan engine via the V-shaped connector when the mixer is attached to the first engine component at the second attachment location and to the second engine component at the third attachment location;
wherein the first leg is attached only to the first engine component with respect to the first engine component, the second engine component, and the second connector at the second attachment location; and
wherein the second connector is shaped as a ring.

2. The mixer assembly group according to claim 1 , wherein, via the V-shaped connector, the mixer is elastically supported in the radially displaceable manner with respect to the central axis of the turbofan engine.

3. The mixer assembly group according to claim 1 , wherein the first attachment location is radially offset with respect to at least one chosen from the second attachment location and the third attachment location with respect to the central axis.

4. The mixer assembly group according to claim 1 , wherein the mixer includes at least one chosen from:
a blossom-shaped or meander-shaped contour; and guide elements of different axial lengths for guiding the first fluid flow and the second fluid flow.

5. The mixer assembly group according to claim 1 , wherein the mixer is at least partially manufactured from a fiber reinforced composite.

6. The mixer assembly group according to claim 5 , wherein the mixer is manufactured from a ceramic matrix composite.

7. The mixer assembly group according to claim 1 , wherein the second connector extends across the V-shaped connector which is attached to the mixer at the first attachment location.

8. The mixer assembly group according to claim 1 , wherein an axial minimum distance of the mixer to the second engine component is predetermined through the V-shaped connector and the second connector, so that a gap is defined between the mixer and the second engine component.

9. The mixer assembly group according to claim 8 , wherein the gap is a ring-shaped gap.

10. The mixer assembly group according to claim 8 , and further comprising at least one distance piece for connecting the mixer to the second engine component, to hold the mixer at the axial minimum distance to the second engine component.

Assignees

• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• Todorovic Predrag
• Kubisch Thomas

Classifications

• F05D2260/30

  Retaining components in desired mutual position · CPC title

• F05D2230/642

  using maintaining alignment while permitting differential dilatation · CPC title

• Y02T50/60

  Efficient propulsion technologies, e.g. for aircraft · CPC title

• F02K1/386 Primary

  mixing devices in the jet pipe, e.g. for mixing primary and secondary flow · CPC title

• F02K1/80

  Couplings or connections · CPC title