JP2001065366A - Air intake for gas turbine engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air intake for a gas turbine engine provided with a nose cone decreased in manufacturing cost in a simple structure. SOLUTION: This air intake 31 is provided with a hollow nose cone 1 and a fixed part 3 fixing its opening end part 1a to a base part 2. The nose cone 1 is integrally molded by laminating a plurality of sheet materials, formed of fiber reinforced plastic continued in a cone-shaped peripheral direction, in this cone-shaped inner/outer direction. An outer side surface S of the opening end part 1a is formed in tapered shape so as to be continued to an external peripheral surface of the base part 2, the fixed part 3 is provided with a connection member 4 connecting an inner side surface U of the opening end part 1a of the nose cone 1 and the base part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air intake for a gas turbine engine.

[0002]

2. Description of the Related Art The structure of an air intake of a conventional gas turbine engine will be described with reference to FIG. 3, for example. In the gas turbine engine 30 shown in FIG. After being converted into high-pressure compressed air by the compressor 32, it is sent to the downstream combustion chamber, where it is burned together with the injected fuel to become high-temperature high-pressure gas. The hot, high-pressure gas exiting the combustion chamber is sent to a turbine, which expands the hot, high-pressure gas and extracts its thermal energy as mechanical work to drive each output.

[0003] In the gas turbine engine 30 having such a configuration, a nose cone 33 for forming an air flow path is provided in the air intake 31. The nose cone 33 has a substantially conical shape having a hollow inside, and a portion corresponding to the bottom is open. The open end 33a of the nose cone 33 is fixed to a rotor blade (base) 34.

FIG. 4 is an enlarged sectional view of the vicinity of a connecting portion A between the nose cone 33 and the base 34 in FIG. FIG.
, The open end 33a of the nose cone 33 is formed so as to have a step, and the end face is
It has a flange portion 35 directed to the side. Then, the nose cone 33 and the base portion 34 are connected by connecting the flange portion 35 and the base portion 34 with each other via a connecting member 36 and bolting them.
Is fixed. Further, a fairing 37 made of a thin metal plate is provided at a step portion of the opening end 33a, and the outer surface of the nose cone 33 and the outer peripheral surface of the base 34 are continuous with the fairing 37.

At this time, the nose cone 33 is formed by arranging a plurality of members made of fiber reinforced plastic (FRP). That is, nose cone 3
3, a step (a) of cutting the fiber woven fabric body 40 to form a triangular binder 41 and a step (b) of preforming the binder 41 into a molded binder 42 as shown in FIG.
And a predetermined number (for example, 100) of the molding binders 42
(C) a step of forming a preform 43 having a substantially hollow conical shape with a bottom opened by arranging, and a step of accommodating the preform 43 in a mold 44 and injecting a resin R between fibers of the preform 43 ( d). In this case, in the step (c), the forming binder 4
2 are arranged by hand.

[0006]

As described above, the workability is low because the molding binders 42 are arranged manually in the step (c). In addition, the nose cone 33 is formed by cutting the fiber woven fabric 40 and arranging the forming binders 42 obtained by the cutting, and requires many steps, so that the manufacturing cost is increased. Further, the fairing 37 provided for stabilizing the shape of the air flow path is formed by, for example, superplastic processing, and its manufacturing cost is high. Further, since the fairing 37 is often damaged during use and needs to be replaced at a high frequency, the efficiency is low and the cost is further increased.

The present invention has been made in view of such circumstances, and has as its object to provide an air intake of a gas turbine engine having a nose cone with a simple structure and reduced manufacturing cost.

[0008]

In order to solve the above-mentioned problems, an air intake of a gas turbine engine according to the present invention comprises a hollow conical nose cone having an open bottom, and an open end of the nose cone. A fixing portion for fixing to the base portion, wherein the nose cone is formed by integrally laminating a plurality of sheet materials continuous in the circumferential direction of the cone shape in the inward and outward directions of the cone shape. .

According to the present invention, since the number of manufacturing steps is reduced by integrally forming the nose cone, manufacturing costs can be reduced.

The outer surface of the open end of the nose cone is formed in a tapered shape so as to be continuous with the outer peripheral surface of the base. The obtained air flow path shape can be obtained.

The fixing portion includes a connecting member for connecting the inner surface of the opening end of the nose cone to the base.
For example, the nose cone and the base can be stably connected without forming a projecting portion such as a bolt on the outer surface of the nose cone. That is, since there is no projecting portion on the outer surface of the nose cone, the air flowing through the flow path is stabilized.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an air intake of a gas turbine engine according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a main part of an air intake of a gas turbine engine according to the present invention.
This is a portion corresponding to the connection portion A in FIG.

That is, the nose cone 1 in FIG.
The gas turbine engine 30 shown in FIG. 3 is provided at the air intake 31 and forms a flow path for the intake air. The nose cone 1 has a substantially conical shape in which the inside is formed to be hollow. The nose cone 1 is disposed with its apex facing toward the upstream side of the air intake 31, and the bottom is open.

In FIG. 1, an air inlet 31 has a hollow nose cone 1 formed in a substantially conical shape for forming a flow path of air to be introduced, and an open end 1a of the nose cone 1 as a base. And a fixing portion 3 for fixing the fixing portion 2 to the fixing portion 2.
This nose cone 1 is made of fiber reinforced plastic (FRP)
Are integrally formed by the method. Specifically, the nose cone 1 is formed by laminating a plurality of sheet materials made of FRP that are continuous in the circumferential direction of the cone and are laminated in the inside and outside directions of the cone.

Outer surface S of open end 1a of nose cone 1
Is formed in a tapered shape so as to be continuous with the outer peripheral surface of the base 2. That is, the outer surface S of the nose cone 1 and the base 2
Is provided so as to be substantially linear in cross section.

The fixing portion 3 is an opening end 1 of the nose cone 1.
a coupling member 4 for coupling the inner surface U of FIG. The coupling member 4 is formed of, for example, a metal such as aluminum, and has a contact surface 4 a that is in contact with the inner surface U of the open end 1 a of the nose cone 1. The opening end 1a of the nose cone 1 is formed with a bolt hole provided corresponding to the coupling member 4, and the nose cone 1 and the coupling member 4 are separated from the outer surface S of the nose cone 1 by the bolt hole. Is fixed by bolts inserted into the joint member 4 and the coupling member 4 and the base 2 are fixed by bolts.
The nose cone 1 and the base 2 are joined. At this time, the bolt inserted into the open end 1a does not protrude outward from the outer surface S of the nose cone 1, that is, the open end 1a
Are provided so as to be accommodated in the bolt holes provided in the bolt holes.

Such a nose cone 1 is manufactured by a manufacturing method having steps as shown in FIG. That is, as shown in FIG. 2, the nose cone 1 is configured such that a predetermined number of laminated sheet-like fiber woven bodies (sheet materials) 20 are formed into a predetermined conical shape.
a) forming the preform 22 by pressing the fiber woven body 20 into the formwork 21 from the outside of the inlet 21a using a deformation load jig or the like (P1); A step (P2) of injecting the resin R between the fibers of the preform 22 housed therein.

In this case, in the step (P1), the mold 21
The peripheral edge portion of the fiber woven fabric body 20 disposed at the entrance 21 a of the rim is fixed so as to be sandwiched between the formwork 21 by a wrinkle holding jig 23. When the resin R is injected in the step (P2), the inlet 21a of the mold 21 is
Is closed by a lid 24. In this case, the clamping force by the wrinkle holding jig 23, the deformation speed by the deformation load jig, the injection amount of the resin R per unit time, and the like are set to predetermined values.

The nose cone 1 integrally formed through the steps described above is fixed to the base 2 by the fixing portion 3.
Fixed to

As described above, the nose cone 1 is
Since it is manufactured by injecting the resin R into the fiber woven body 20 after pushing the sheet-like fiber woven body 20 into the inside, the number of steps is greatly reduced as compared with the related art. Therefore, manufacturing costs can be reduced.

Further, the outer surface S of the open end 1a of the nose cone 1 is formed in a tapered shape so as to be substantially flush with the outer peripheral surface of the base 2, so that an expensive fairing as in the prior art can be formed. Without providing, a stable air flow path shape can be obtained. That is, high-cost fairing is not required, so that the cost of the entire nose cone 1 can be reduced.

The fixing part 3 is an open end 1 of the nose cone 1.
Since the coupling member 4 for coupling the inner surface U and the base 2 is provided, stable coupling between the nose cone 1 and the base 2 can be realized without forming a projecting portion such as a bolt on the outer surface S. That is, since the outer surface S of the nose cone 1 has no protruding portion, the air flowing through the flow path is stabilized.

The present invention can be applied to, for example, a propeller spinner for an aircraft or an industrial fan (such as a tunnel fan) as a member having the same shape as the nose cone 1 described above.

[0024]

The gas inlet of the gas turbine according to the present invention has the following effects. (1) Since the number of manufacturing steps is reduced by integrally forming the nose cone, manufacturing costs can be reduced. (2) Since the outer surface of the open end of the nose cone is formed in a tapered shape so as to be continuous with the outer peripheral surface of the base portion, for example, a stable air flow path is provided without providing an expensive fairing as in the related art. Shape can be obtained. (3) Since the fixing portion includes a coupling member that couples the inner surface of the opening end of the nose cone to the base, the nose cone and the base can be formed without forming a projecting portion such as a bolt on the outer surface of the nose cone. Can be stably bonded. That is, since there is no projecting portion on the outer surface of the nose cone, the air flowing through the flow path is stabilized.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing an embodiment of an air intake of a gas turbine engine of the present invention.

FIG. 2 is a diagram illustrating a method of manufacturing a nose cone relating to an air intake of a gas turbine engine according to the present invention.

FIG. 3 is a cross-sectional view for explaining the entire air intake of the gas turbine engine.

FIG. 4 is an enlarged sectional view of a main part relating to an air intake of a conventional gas turbine engine.

FIG. 5 is a diagram for explaining a method of manufacturing a nose cone relating to an air intake of a conventional gas turbine engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nose cone 1a Open end 2 Base 3 Fixed part 4 Coupling member 31 Air intake S Outer side surface U Inner side surface

Claims (3)

[Claims] 1. A nose cone having a hollow cone shape with an open bottom, and a fixing portion for fixing an open end of the nose cone to a base portion, wherein the nose cone is continuous in a circumferential direction of the cone shape. An air inlet for a gas turbine engine, wherein a plurality of sheet materials are laminated and formed integrally in the inner and outer directions of the cone. 2. The air intake of a gas turbine engine according to claim 1, wherein an outer surface of an open end of the nose cone is formed in a tapered shape so as to be continuous with an outer peripheral surface of the base. Characteristic air intake for gas turbine engines. 3. The air intake of a gas turbine engine according to claim 1, wherein the fixing portion includes a coupling member that couples an inner surface of an opening end of the nose cone to a base. The air intake of a gas turbine engine.