CN111720237B - Fan blade - Google Patents
Fan blade Download PDFInfo
- Publication number
- CN111720237B CN111720237B CN201910210227.1A CN201910210227A CN111720237B CN 111720237 B CN111720237 B CN 111720237B CN 201910210227 A CN201910210227 A CN 201910210227A CN 111720237 B CN111720237 B CN 111720237B
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- Prior art keywords
- fan blade
- layer
- pressure surface
- surface layer
- edge
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K3/00—Plants including a gas turbine driving a compressor or a ducted fan
- F02K3/02—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber
- F02K3/04—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention aims to provide a fan blade. The invention provides a fan blade, which comprises a front insulating layer, a front edge layer and a fan blade, wherein the front edge layer is connected to the front edge of a middle part; the suction surface layer comprises a main body part and an edge part; in the circumferential direction of the middle part, two ends of the front insulating layer are respectively connected with the front end of the edge part and the pressure surface layer, and the rear end of the edge part is connected with the main body part; wherein the pressure facing layer, the front dielectric layer, and the edge portion are made of a first density material. Due to the arrangement of the front insulating layer, seams between two sides of the middle part in the thickness direction of the fan blade and the pressure surface layer and between two sides of the middle part and the suction surface layer are not directly exposed, when the fan blade is impacted by birds, the seams are not directly impacted, and the fan blade is not easily layered, so that the fan blade has the advantages of high strength and difficulty in layering due to impact.
Description
Technical Field
The present invention relates to a fan blade, and more particularly to a rotor blade for an aircraft turbine engine.
Background
One of the keys of a civil aircraft engine is a large size fan blade. The strength requirements are more stringent due to the increased size of the blades. For a high bypass ratio turbofan engine, solid fan blades cannot meet the requirements, and light fan blades need to be created.
The weight reduction design is carried out on the foreign advanced civil engines: the R & R company generates a hollow pure titanium alloy hollow fan blade with a reinforced stringer through a superplastic forming-diffusion connection technology; the fan blade of GE company adopts the composite material blade that comprises different materials (composite material and titanium alloy), and composite material is the blade main part, and titanium alloy is as borduring. The weight-reducing hollow rate of the pure titanium alloy hollow fan blade of the R & R company reaches 40%, and the equivalent weight-reducing hollow rate of the composite material-titanium alloy edge-covered blade of the GE company reaches more than 60%. Both of these designs are key patented technologies for engine design and manufacture. The design of lightweight fan blades is gaining importance from various large engine companies.
Patent document CN106762813A discloses a fan blade characterized in that the fan blade is made up of layers of different materials laid up along the thickness direction thereof in at least one chord-wise section. In this solution, adjacent material layers are joined together by gluing. This design is susceptible to de-bonding and delamination when struck by a bird, resulting in blade failure.
Disclosure of Invention
The invention aims to provide a fan blade which has the advantages of high strength and difficulty in layering due to impact.
To achieve the stated purpose, the fan blade includes the pressure surface course, intermediate part and suction surface course; the pressure surface layer is provided with a pressure surface, and the suction surface layer is provided with a suction surface; the pressure surface layer, the middle part and the suction surface layer are sequentially connected in an overlaying manner in the thickness direction of the fan blade;
wherein the fan blade further comprises a leading edge layer connected to a leading edge of the middle portion; the suction surface layer comprises a main body part and an edge part;
in the circumferential direction of the middle part, two ends of the front insulating layer are respectively connected with the front end of the edge part and the pressure surface layer, and the rear end of the edge part is connected with the main body part; wherein the pressure facing, the front layer, and the edge portion are made of a first density material.
In one embodiment, the fan blade further comprises a suture; the stitching line penetrates the pressure surface layer, the intermediate portion, and the edge portion in a thickness direction of the fan blade to integrally connect the pressure surface layer, the intermediate portion, and the edge portion.
In one embodiment, the suture comprises a first portion and a second portion; the first line portion penetrates the pressure surface layer, the intermediate portion, and the edge portion in a thickness direction of the fan blade;
the second line portion penetrates the pressure surface layer, the intermediate portion, and the main body portion in a thickness direction of the fan blade to integrally connect the pressure surface layer, the intermediate portion, and the main body portion.
In one embodiment, the first line portion and/or the second line portion extend from the suction surface through the fan blade to the pressure surface, and from the pressure surface through the fan blade to the suction surface in a thickness direction of the fan blade; and/or
The first line portion and/or the second line portion extend from the pressure surface through the fan blade to the suction surface, and from the suction surface through the fan blade to the pressure surface in a thickness direction of the fan blade.
In one embodiment, the pressure face layer, the front insulating layer and the edge portion are integrally molded.
In one embodiment, the first density material is a metal.
In one embodiment, the intermediate portion comprises a plurality of intermediate layers; the intermediate layers are sequentially connected in a stacking manner along the thickness direction of the fan blades; the leading edge of each of the intermediate plies is joined to the leading edge ply;
wherein two adjacent intermediate layers are made of the first and second density materials, respectively, and the intermediate layer connected to the pressure face layer is made of the second density material.
In one embodiment, the number of the intermediate layers is an odd number, and the main body portion is made of the first density material; or
The number of the intermediate layers is even, and the main body portion is made of the second density material.
In one embodiment, the density of the first density material is greater than the density of the second density material.
In one embodiment, the second density material is a composite material.
In one embodiment, the pressure surface layer and the edge portion are provided with stitching micropores for the stitching thread to pass through.
In one embodiment, the pressure surface layer, the middle layer made of the first density material and the main body made of the first density material are provided with stitching micropores for the stitching threads to pass through.
The positive progress effects of the invention are as follows: the invention provides a fan blade, which comprises a front insulating layer, a front edge layer and a fan blade, wherein the front edge layer is connected to the front edge of a middle part; the suction surface layer comprises a main body part and an edge part; in the circumferential direction of the middle part, two ends of the front insulating layer are respectively connected with the front end of the edge part and the pressure surface layer, and the rear end of the edge part is connected with the main body part; wherein the pressure facing layer, the front dielectric layer, and the edge portion are made of a first density material.
Due to the arrangement of the front insulating layer, seams between two sides of the middle part in the thickness direction of the fan blade and the pressure surface layer and between two sides of the middle part and the suction surface layer are not directly exposed, when the fan blade is impacted by birds, the seams are not directly impacted, and the fan blade is not easily layered, so that the fan blade has the advantages of high strength and difficulty in layering due to impact.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a fan blade;
FIG. 2 is a schematic view of section A-A of FIG. 1;
FIG. 3 is a schematic view of section B-B of FIG. 1;
FIG. 4 is a cross-sectional view of the fan blade showing the stitches;
FIG. 5 is a schematic view of the pressure face layer showing stitched micro-holes.
Detailed Description
The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from those described herein, and it will be readily appreciated by those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the invention.
The following discloses embodiments or examples of various implementations of the subject technology. Specific examples of components and arrangements are described below to simplify the present disclosure, but these are merely examples and do not limit the scope of the invention. For example, if a first feature is formed over or on a second feature described later in the specification, this may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact. Additionally, reference numerals and/or letters may be repeated among the various examples throughout this disclosure. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, when a first element is described as being coupled or coupled to a second element, the description includes embodiments in which the first and second elements are directly coupled or coupled to each other, as well as embodiments in which one or more additional intervening elements are added to indirectly couple or couple the first and second elements to each other.
It should be noted that fig. 1-5 are exemplary only, are not drawn to scale, and should not be construed as limiting the scope of the invention as actually claimed.
A typical fan blade 900 is shown in FIGS. 1, 2, and 3 and includes a leading edge 91, a trailing edge 92, a blade tip 93, a dovetail 94, and a blade face. The blade surface is the outer surface of the fan blade 900 and is divided into a pressure surface 1a and a suction surface 3 a.
As shown in fig. 2, the fan blade 900 is formed by stacking different material layers along the thickness direction thereof, specifically, the fan blade 900 includes a pressure surface layer 1, an intermediate portion 2, and a suction surface layer 3; the pressure surface layer 1 is provided with a pressure surface 1a, and the suction surface layer 3 is provided with a suction surface 3 a; the pressure surface layer 1, the intermediate portion 2, and the suction surface layer 3 are sequentially connected in a stacked manner in the thickness direction of the fan blade 900.
To avoid delamination of the pressure facing 1, the intermediate portion 2 and the suction facing 3 upon impact to the fan blade 900, in the embodiment shown in fig. 2, the fan blade 900 further comprises a leading edge layer 4, the leading edge layer 4 being connected to the leading edge of the intermediate portion 2; the suction surface layer 3 includes a main body portion 31 and an edge portion 32; in the circumferential direction of the intermediate portion 2, both ends of the leading edge layer 4 are connected to the front end of the edge portion 32 and the pressure surface layer 1, respectively, and the rear end of the edge portion 32 is connected to the main body portion 31; wherein the pressure face layer 1, the leading edge layer 4 and the edge portion 32 are made of a first density material.
More specifically, the pressure facing layer 1, the leading edge layer 4, and the edge portion 32 are integrally formed. The outer surfaces of the main body portion 31 and the edge portion 32 are combined into a suction surface 3 a.
In an embodiment of the invention, the leading edge 91 is located forward of the trailing edge 92. The circumferential direction of the intermediate portion 2 refers to a direction around the intermediate portion 2 in fig. 2. The first density material may be a metal, such as a titanium alloy.
Due to the arrangement of the front layer 4, seams between two sides of the middle part 2 in the thickness direction of the fan blade 900 and the pressure surface layer 1 and the suction surface layer 3 respectively are not directly exposed, when the fan blade is impacted by birds, the seams are not directly impacted, and the fan blade 900 is not easily layered, so that the fan blade 900 has the advantages of high strength and difficulty in layering due to impact.
To further strengthen fan blade 900, fan blade 900 also includes stitching 5; the stitches 5 penetrate the pressure surface layer 1, the intermediate portion 2, and the edge portion 32 in the thickness direction of the fan blade 900 to integrally connect the pressure surface layer 1, the intermediate portion 2, and the edge portion 32.
Since the pressure face layer 1 and the edge portion 32 are both made of the first density material and therefore have the same strength, the sewing line 5 can stably fix the intermediate portion 2 inside the pressure face layer 1, the front edge layer 4, and the edge portion 32, thereby improving the structural strength of the front edge 91 of the fan blade 900. The stitches 5 may be made of carbon fibers, aramid fibers, glass fibers, metal wires or the like.
With continued reference to fig. 2, 3, 4, the intermediate portion 2 comprises a plurality of intermediate layers 2 a; the intermediate layers 2a are sequentially stacked and connected in the thickness direction of the fan blade 900; the front edge of each intermediate layer 2a is connected to the front edge layer 4; wherein two adjacent intermediate layers 2a are made of a first and a second density material, respectively, and the intermediate layer 2a connected to the pressure face layer 1 is made of the second density material. More specifically, the density of the first density material is greater than the density of the second density material. The above-described approach helps reduce the weight of the fan blade 900 and also ensures the structural strength of the fan blade 900.
The second density material may be a composite material. The number of the layering layers, the thickness of each layer and the change of the thickness of each layer in the embodiment can be obtained through calculation, comprehensive optimization, such as pneumatics, strength and the like.
In a more specific embodiment, the number of intermediate layers 2a is odd, and the main body portion 31 is made of a first density material; as shown in fig. 2, 3 and 4, the number of the intermediate layer 2a is 3, and the main body portion 31, the edge portion 32, the leading edge layer 4 and the pressure face layer 1 are all made of the first density material.
In an embodiment not shown, the intermediate portion 2 is even in number and the main portion 31 is made of a second density material. If the number of layers of the intermediate layer 2a is 4, the main body portion 31 is made of the second density material.
With continued reference to fig. 4, suture 5 includes a first line portion 5a and a second line portion 5 b; the first line portion 5a penetrates the pressure surface layer 1, the intermediate portion 2, and the edge portion 32 in the thickness direction of the fan blade 900; the second line portion 5b penetrates the pressure surface layer 1, the intermediate portion 2, and the body portion 31 in the thickness direction of the fan blade 900 to integrally connect the pressure surface layer 1, the intermediate portion 2, and the body portion 31.
The first string portion 5a and the second string portion 5b may be provided separately, but from the viewpoint of improving the structural strength, the terminal end of the first string portion 5a and the starting end of the second string portion 5b are connected to each other in the path of the suture 5 so that the first string portion 5a and the second string portion 5b can receive force as a whole.
With continued reference to fig. 4, in the thickness direction of the fan blade 900, the first line portion 5a and/or the second line portion 5b extend from the suction surface 3a through the fan blade 900 to the pressure surface 1a, from the pressure surface 1a through the fan blade 900 to the suction surface 3 a; and/or
The first line portion 5a and/or the second line portion 5b extend from the pressure surface 1a through the fan blade 900 to the suction surface 3a, and from the suction surface 3a through the fan blade 900 to the pressure surface 1a in the thickness direction of the fan blade 900.
The lines 5 penetrate the fan blade 900 in the thickness direction of the fan blade 900, and the paths penetrating the fan blade 900 at a time are not required to be parallel to each other, and the paths penetrating the fan blade 900 at a time may be angled so long as the first line portion 5a can penetrate the pressure surface layer 1, the intermediate portion 2, and the edge portion 32 when penetrating the fan blade 900, and the second line portion 5b can penetrate the pressure surface layer 1, the intermediate portion 2, and the main body portion 31 when penetrating the fan blade 900.
As shown in fig. 5, in order to facilitate the threading of the sewing thread 5, the pressure surface layer 1 and the edge portion 32 are provided with sewing micro-holes K through which the sewing thread 5 passes.
In another embodiment, the pressure surface layer 1, the middle layer 2a made of the first density material and the main body portion 31 made of the first density material are provided with stitching micropores K through which the stitching threads 5 pass.
The intermediate layer 2 made of the second density material and the main body portion 31 made of the second density material are easily penetrated, so that it is not necessary to provide sewing microholes.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make modifications and variations without departing from the spirit and scope of the present invention.
Claims (5)
1. A fan blade comprising a pressure facing (1), an intermediate portion (2) and a suction facing (3); the pressure surface layer (1) is provided with a pressure surface (1a), and the suction surface layer (3) is provided with a suction surface (3 a); the pressure surface layer (1), the middle part (2) and the suction surface layer (3) are sequentially connected in a stacking manner along the thickness direction of the fan blade (900);
characterized in that the fan blade (900) further comprises a front insulation layer (4), the front insulation layer (4) being connected to a front side edge of the intermediate portion (2); the suction surface layer (3) comprises a main body part (31) and an edge part (32);
in the circumferential direction of the middle part (2), two ends of the front insulating layer (4) are respectively connected with the front end of the edge part (32) and the pressure surface layer (1), and the rear end of the edge part (32) is connected with the main body part (31); wherein the pressure surface layer (1), the front insulating layer (4) and the edge portion (32) are made of metal and are integrally molded;
the fan blade (900) further comprises a suture (5), wherein the suture (5) comprises a first line part (5a) and a second line part (5b), and on a penetrating path of the suture (5), the terminal end of the first line part (5a) is connected with the starting section of the second line part (5 b); the first line part (5a) penetrates through the pressure surface layer (1), the middle part (2) and the edge part (32) in the thickness direction of the fan blade (900) to integrally connect the pressure surface layer (1), the middle part (2) and the edge part (32), and the second line part (5b) penetrates through the pressure surface layer (1), the middle part (2) and the main body part (31) in the thickness direction of the fan blade (900) to integrally connect the pressure surface layer (1), the middle part (2) and the main body part (31), wherein sewing micropores (K) for the sewing lines (5) to penetrate are formed in the pressure surface layer (1) and the edge part (32);
the intermediate portion (2) comprises a plurality of intermediate layers (2 a); the intermediate layers (2a) are sequentially connected in a stacking manner in the thickness direction of the fan blade (900); the front side edge of each intermediate layer (2a) is connected with the front insulating layer (4), and each intermediate layer (2a) extends backwards to the tail edge (92) of the fan blade (900), wherein two adjacent intermediate layers (2a) are respectively made of the metal and the composite material.
2. A fan blade according to claim 1, characterized in that the first line portion (5a) and/or the second line portion (5b) extend from the suction surface (3a) through the fan blade (900) to the pressure surface (1a), from the pressure surface (1a) through the fan blade (900) and to the suction surface (3a) in the thickness direction of the fan blade (900); and/or
The first line portion (5a) and/or the second line portion (5b) extend from the pressure surface (1a) through the fan blade (900) to the suction surface (3a), and from the suction surface (3a) through the fan blade (900) to the pressure surface (1a) in the thickness direction of the fan blade (900).
3. The fan blade of claim 1,
the intermediate layer (2a) connected to the pressure side layer (1) is made of the composite material.
4. A fan blade as claimed in claim 3, characterized in that the number of intermediate layers (2a) is odd, the main body portion (31) being made of said metal; or
The number of intermediate layers (2a) is even and the main body portion (31) is made of the composite material.
5. The fan blade as set forth in claim 4, characterized in that the intermediate layer (2a) made of the metal and the main body portion (31) made of the metal are provided with sewing microholes (K) through which the sewing threads (5) pass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910210227.1A CN111720237B (en) | 2019-03-19 | 2019-03-19 | Fan blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910210227.1A CN111720237B (en) | 2019-03-19 | 2019-03-19 | Fan blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111720237A CN111720237A (en) | 2020-09-29 |
| CN111720237B true CN111720237B (en) | 2022-02-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910210227.1A Active CN111720237B (en) | 2019-03-19 | 2019-03-19 | Fan blade |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1004986A (en) * | 1971-07-02 | 1977-02-08 | General Electric Company | Composite compressor blade |
| DE4411679C1 (en) * | 1994-04-05 | 1994-12-01 | Mtu Muenchen Gmbh | Blade of fibre-composite construction having a protective profile |
| CN104889703A (en) * | 2007-12-31 | 2015-09-09 | 涡轮发动机零部件科技公司 | Method of Manufacturing a Turbine Fan Blade |
| CN105604978A (en) * | 2014-11-21 | 2016-05-25 | 中航商用航空发动机有限责任公司 | Shock-resistant enhanced turbine engine fan blade |
| CN107542498A (en) * | 2016-06-28 | 2018-01-05 | 中国航发商用航空发动机有限责任公司 | A kind of mixed structure fan blade |
| CN108661945A (en) * | 2017-03-31 | 2018-10-16 | 中国航发商用航空发动机有限责任公司 | A kind of fan blade |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103573469B (en) * | 2013-10-20 | 2016-08-31 | 中国科学院工程热物理研究所 | A kind of fan aerodynamic arrangement structures and methods of fanjet |
| CN106762813B (en) * | 2017-03-31 | 2019-09-17 | 中国航发商用航空发动机有限责任公司 | A kind of fan blade |
-
2019
- 2019-03-19 CN CN201910210227.1A patent/CN111720237B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1004986A (en) * | 1971-07-02 | 1977-02-08 | General Electric Company | Composite compressor blade |
| DE4411679C1 (en) * | 1994-04-05 | 1994-12-01 | Mtu Muenchen Gmbh | Blade of fibre-composite construction having a protective profile |
| CN104889703A (en) * | 2007-12-31 | 2015-09-09 | 涡轮发动机零部件科技公司 | Method of Manufacturing a Turbine Fan Blade |
| CN105604978A (en) * | 2014-11-21 | 2016-05-25 | 中航商用航空发动机有限责任公司 | Shock-resistant enhanced turbine engine fan blade |
| CN107542498A (en) * | 2016-06-28 | 2018-01-05 | 中国航发商用航空发动机有限责任公司 | A kind of mixed structure fan blade |
| CN108661945A (en) * | 2017-03-31 | 2018-10-16 | 中国航发商用航空发动机有限责任公司 | A kind of fan blade |
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| CN111720237A (en) | 2020-09-29 |
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