Bracket of flame stabiliser of afterburner duct, ventilation chamber of flame stabiliser bracket, and gas-turbine engine

FIELD: engines and pumps.

SUBSTANCE: bracket of flame stabiliser of afterburner duct of gas turbine engine, namely aircraft jet turbine engine includes the housing made in the form of open dihedral angle, and ventilation chamber (24). Ventilation chamber passes inside this housing and has on one of its ends the alignment pin inserted in the hole made in the above housing. Bracket includes fuel header (26) passing inside the housing along ventilation chamber, guide and alignment devices for guiding and alignment of fuel header in relation to ventilation chamber, and heat protection screen (28) fixed on the above housing and closing the open side of dihedral angle. Ventilation chamber includes devices for its fixture in fixed position in the bracket housing, which are independent of heat protection screen. Ventilation chamber of bracket of flame stabiliser includes open end and opposite end made together with axial pin. Pin represents annular projection intended for being supported on the base.

EFFECT: invention allows refusing to use the alignment and fixture projection on ventilation chamber, as well as excluding the following: wear of heat protection screen, wear of pin, and risk of destruction of fuel header.

 

The present invention relates to the bracket stabilizer flame afterburners in a gas turbine engine such as a turbojet engine.

Afterburner chamber in the classic version contains a set of brackets stabilizers flame, each of which is formed hollow dihedral angle, an edge whose vertices are oriented toward the front on the thread part of the afterburning chamber and which is closed at its rear flow side of the screen thermal protection. The fuel manifold is held in the radial direction in the inner cavity of the above-mentioned bracket from the outer casing afterburners. This fuel manifold connected with the means of fuel and contains holes spraying fuel.

The Plenum is held in the above-mentioned bracket is essentially parallel to the fuel manifold, between the collector and the edge of the dihedral angle bracket, and includes at its outer radial end of the hole capture cooling air intended for dispersion in the bracket through the holes drilled in this chamber. The inner radial end of the Plenum is closed and contains a centering finger inserted into the slot in the bracket.

This ventilation chambers which also contains located in close proximity to its inner radial direction of the end of the ledge, oriented in the direction of flow, and the free end of the protrusion is inserted into the corresponding hole screen thermal protection to ensure the retention of the Plenum. In the hole made in the above-mentioned protrusion is inserted the lower end of the fuel manifold to ensure it is centered in the bracket.

In the process of mounting the said bracket is connected with a Plenum and shield thermal protection, which is fixed on the bracket by means of an attached by welding pins with ledges and which still captures the Plenum. Then the fuel manifold is installed in the bracket in the direction from the outer casing afterburners by introducing its interior in the radial direction of the end between thermal protection and ventilation camera up to accommodate this late in the hole centering formed in the above-mentioned protrusion of the Plenum.

However, this operation is carried out blindly, which leads to danger improper installation of the fuel manifold, the inner end of which is able to be inserted in the free space located between the said lip and the side wall of the bracket. The result may be unsatisfactory distributed the e sprayed fuel in the bracket and the deterioration of the cooling bracket, that can lead to the destruction of the screen thermal protection.

In the process of functioning of the Plenum is exposed to significant vibrations, which cause mechanical wear due to the friction of her lip and the corresponding holes made in the screen, thermal protection, which leads to the displacement of the camera in the direction of the inside and the protrusion of the finger center of the Plenum in the primary gas flow, as well as to wear and extending holes of the bracket, into which is inserted the finger in the center of the Plenum.

The offset of the Plenum in the direction of the inside can lead to the exit of the fuel manifold from the hole above ledge and to the destruction of the collector.

The technical problem of this invention is to develop a relatively simple, efficient and economical device which can eliminate the aforementioned problems.

For this purpose, this invention proposes a bracket stabilizer flame afterburners, comprising a housing made in the form of an open dihedral angle, the Plenum held within the housing and containing at one of its ends a finger centering inserted into the hole made in the above-mentioned housing, a fuel reservoir, passing inside of this enclosure along in ntilation camera, guides and centering means for the said fuel manifold relative to the vent chamber and the screen thermal protection, mounted on said housing and overlying the open side of the dihedral angle, wherein the Plenum includes means for fixing it in a stationary position in the body of the bracket, which are independent of screen thermal protection.

Thus, the centering and fixation of the stationary Plenum in the bracket stabilizer flame are enforced regardless of the screen thermal protection that allows you to refuse the use of the point of the centering and fixing provided on the Plenum, known from the prior art.

Also excluded:

mechanical wear of the screen, thermal protection, which is a consequence of the vibration of the projection in the receiving hole formed in the heat-shielding screen;

mechanical wear of the centering finger in the hole formed in the bracket, and the corresponding wear of the edges of the holes;

danger of destruction of the fuel manifold as a result of its exit from the guide and centering means formed on the Plenum.

In accordance with another feature offered from the Britania finger centering the Plenum passes through the hole, formed in the body of the bracket, and includes fixation means in a stationary position this Plenum on the body of the bracket.

Preferably, these fixation means in a stationary position contained annular ledge formed on the centering finger and intended for entry into supporting contact with the edge of the hole made in the body of the bracket inside the bracket, and means to hold the finger in this hole, formed at the end of this finger is on the outside relative to the bracket, contained a circular piece attached by means of soldering or welding on the finger centering of the Plenum.

Preferably, the aforementioned annular ledge finger centering clung to the bracket by means of a ring part, which is mounted at the end of that finger on the outside of the bracket.

This ensures that the mount without gap Plenum on the body of the bracket, and fixed radial vibration of the camera in relation to the chassis bracket.

It is advisable that this ring detail contained at least one planar slice, interacting with emphasis with the corresponding element of the body of the bracket for securing the connection in a stationary position by rotational movement of the veins is ilational camera relative to the bracket.

It is also advisable to vent the chamber also contained a transverse ledge with a hole centering the fuel manifold, almost completely fills the space inside the bracket in order to avoid possible unsatisfactory installation of this fuel manifold.

The specified transverse ledge in the inner cavity of the housing bracket does not allow the installation of the end of the fuel manifold differently than the hole in the center, formed in the ledge.

Thus, the blind installation of the fuel reservoir into the body of the bracket will no longer be able to lead to the incorrect location of the fuel manifold and eliminates the risk of wear and damage to the collector and the housing bracket.

In this invention it is also proposed Plenum bracket stabilizer flame containing the open end and an end formed with an essentially axial finger, wherein the finger is an annular support ledge at the base.

It is advisable to vent the chamber was formed with a transverse ledge containing a through hole whose axis is essentially parallel to the longitudinal axis of this Plenum.

The present invention relates to gas turbine engine of the type of the turbojet engine, characterized in that it contains at least one bracket stabilizer flame type described in the preceding statement.

Other details, features and advantages of the invention will be better understood from the description of non-limiting example of implementation, given with reference to the application drawings, in which:

- Figure 1 is a partial schematic view in axial section afterburner of a gas turbine engine;

- Figure 2 is a schematic view in enlarged scale of part of the bracket stabilizer flame, shown in figure 1, illustrating the mounting of the Plenum in the bracket of the flame stabilizer in accordance with the current level of technology;

- Figure 3 is a schematic view in section along the line III-III shown in figure 2, on an enlarged scale;

- Figure 4 is a schematic view corresponding to the view shown in figure 2, but illustrating the locking device in accordance with the invention;

- Figure 5 is a schematic view in section along the line V-V shown in figure 4, on an enlarged scale;

- 6 is a schematic bottom view of the bracket shown in figure 4.

First of all, there are links to 1 to 3 in which the bracket flame stabilizer 10 to be used in the devices known from the anti-shudder performance techniques, mounted on the casing 12 afterburner turbojet engine, on its outer radial end, and the bracket 10 is held essentially in the radial direction in the afterburner and through the sheet merge 14, which separates the primary thread 16 hot gases of combustion from the secondary airflow 18 coming from the fan that is installed in front of the turbojet engine.

The bracket flame stabilizer 10 includes a housing 20, made in the form of an open dihedral angle, the edge of the top 22 which is oriented in the direction against the flow, and the disclosure of which is oriented in the direction of flow, and in which are located the Plenum 24, the fuel manifold 26 and the screen 28 thermal protection, has a cross-sectional C-shaped and closing the open side of the housing 22.

The Plenum 24 is held within the bracket along the edges of its top 22 and includes an outer radial end, which is made open and is supplied with air from the secondary flow 18 through the hole made in the outer radial direction of the chassis bracket. The inner radial portion of the ventilation chamber 24 contains numerous perforations intended for distribution ohla the giving of the air inside the bracket.

The inner radial end of the Plenum forms a cylindrical finger 30, which is inserted without clearance in the hole 32, is made in the base bracket, and the end of the finger 30 is flush with the outer surface of the base 32, not speaking in an outward direction relative to the bracket.

In close proximity to this outside in the radial direction of the end of the Plenum 24 includes a foot 34, which runs in the direction of flow toward the screen 28 thermal protection essentially perpendicular to the longitudinal axis of the Plenum 24, and the free end of the legs forms a ledge 36 that are inserted into the corresponding hole made in the heat-shielding screen 28.

The pad 34 also contains, in its intermediate part between the ventilation chamber 24 and the ledge 36, through the hole intended for the passage of the lower part of the fuel manifold 26 and ensuring the centering of this fuel manifold within the bracket 10.

In the process of mounting the Plenum 24 is first placed in the housing 20 of the bracket 10, and then set display thermal protection 28 and the ledge 36 of the Plenum is inserted into the corresponding hole of this heat shield, and then heat the safety screen 28 is fixed by welding at four points 34 on the side walls of the housing 20 of the bracket, thereby fixing the ventilation chamber 24 inside the bracket. Then the fuel manifold 26 blind is installed in the internal cavity of the bracket with its outside in the radial direction. This operation requires special care, since the lower end of the fuel manifold 26 must be inserted in an opening provided in the foot 34 of the Plenum 24, but not in the free space between the leg 34 and the side wall of the housing 20 of the bracket 10.

During the operation of the ventilation chamber 24 is subjected to vibration in the radial direction inside of the bracket 10, which leads to mechanical wear her lip 36 and edges corresponding holes made in the heat-shielding screen 28, as well as to mechanical wear of the finger 30, made on the inside in the radial direction of the end of this Plenum, and edges corresponding holes formed in the base 32 of the bracket 10.

This mechanical wear is expressed in a gradual lowering of the Plenum 24 inside the bracket 10, and the end of the finger 30 is gradually begins to act under the base 32 of the bracket 10 and disrupt normal conditions afterburning of fuel in the afterburner. In addition, the offset Plenum 24 in the bracket 10 can allow the shape of the inner radial direction of the end of the fuel manifold 26 to exit its guide holes, formed in the foot 34 of the Plenum, which leads to destruction of the fuel manifold 26.

To eliminate these disadvantages, the present invention serves to vent the chamber 24 has been installed and secured within the bracket 10, regardless of the screen thermal protection 28, as schematically presented in figure 4-6.

As can be seen in these drawings, the inner radial end of the Plenum 24 includes a cylindrical finger 40, which passes along the axis of this Plenum 24 and which contains an annular ledge 42, forming a bearing surface intended to support the edge of the hole 44, is made in the base 32 of the bracket 10, and this cylindrical finger 40 extends out from this hole and contains some of the annular part 46, for example the detail of the type of washer that is fixed, for example by welding or soldering, to the end of the finger 40.

The preferred way of opening 44 forms the bottom wall 48 small recess 49 in the base 32 of the bracket 10, and this bottom wall 48 is perpendicular to the longitudinal axis of the Plenum 24 and the finger 40.

In that case, when the recess 49 has a shape other than cylindrical, as is schematically presented in Fig.6, you can give kolavalli 46 corresponding form for to this ring item served the function of preventing rotational movement of the finger 40 and, accordingly, the Plenum 24, relative to their longitudinal axis.

You can also perform one or two flat cut in the contour of the annular part 46, which will correspond to the flat surfaces of the recesses 49 in order to give the function of preventing rotational movement of the annular part 46.

As it is illustrated in figure 4 and 5, the Plenum 24 in this case does not contain tabs 36 that are inserted into the corresponding hole of the screen 28 thermal protection and foot 34, represented in figure 1, is replaced by a transverse ledge 50 of the Plenum 24, and this ledge 50 has the shape of an angular sector and is held inside the housing 20 of the bracket 10 in such a way as to take in the transverse plane, a predominant portion of the free space inside the bracket 10 between the ventilation chamber 24 and with a heat shield 28.

In the present example of implementation of the sides 52 and 54 of the protrusion 50 is made almost parallel respectively to the side walls of the bracket 10 and the heat shield 28 and are held at a small distance from these walls, preventing the installation of interior in the radial direction of the end of the fuel manifold 26 different than guiding otverstie, formed in the ledge 50. Thus it is possible to significantly facilitate installation of the blind that the fuel manifold 26 in the bracket 10 and to thereby exclude the possibility of incorrect placement of this fuel manifold, while providing the best conditions of cooling of the bracket 10 by means of fuel and prolonging the service life of the above-mentioned bracket.

Axial mounting without gap end of the finger 40 of the Plenum 24 into the hole 44 of the base 32 of the bracket 10 eliminates vibrations in the radial direction of the Plenum 24 in the bracket and addresses associated with these vibrations mechanical wear of the bracket and the Plenum.

In the case of burn-out screen thermal protection 28 Plenum 24 continues to hold in the bracket 10 and continues to perform its cooling function of the various elements of the bracket. The fuel manifold 26 in this case is also kept in its place on the ventilation chamber 24 inside the bracket and cannot be destroyed.

1. Bracket stabilizer flame afterburners, comprising a housing (20)made in the form of an open dihedral angle, the ventilation chamber (24)located inside the housing and containing at one of its ends a finger centering (40)inserted into the hole (44)made in the above-mentioned case, t is Pliny collector (26), passing inside the housing along the Plenum (24), guide and centering means for guiding and centering the fuel manifold (26) relative to the vent chamber (24), and the screen thermal protection (28)fixed to the said casing (20) and overlying the open side of the dihedral angle, characterized in that the air chamber (24) includes means (46) it locks into a stationary position in the body of the bracket, which are independent of screen thermal protection.

2. The bracket according to claim 1, characterized in that the finger (40) centering the Plenum passes through the hole (44)formed in the bracket, and includes means (46) locks into a stationary position of the Plenum on the body of the bracket.

3. The bracket according to claim 1, characterized in that the finger (40) contains an annular centering ledge (42)intended for entry into supporting contact with the edge of the hole (44)made in the body of the bracket, this bracket.

4. The bracket according to claim 2, characterized in that the end of the finger (40), which is located outside with respect to said bracket includes means for retention (46) of the finger in the above-mentioned hole.

5. The bracket according to claim 4, characterized in that the said means of retention contain annular part (46)fixed p and soldering or welding on this finger centering of the Plenum.

6. The bracket according to claim 5, characterized in that the annular ledge (42) finger Plenum pressed against the bracket by means of a ring part (46)fixed to the end of this finger.

7. The bracket according to claim 5, characterized in that the annular part (46) includes at least one planar slice, interacting with emphasis with the corresponding element of the bracket to resist rotational movement of the above-mentioned finger in the above-mentioned hole.

8. The bracket according to claim 1, characterized in that the air chamber (24) has a transverse ledge (50)containing the hole centering (56)fuel manifold (26).

9. The bracket of claim 8, wherein the lateral protrusion (50) of the Plenum is almost completely occupies the free space inside the bracket (10) to prevent incorrect installation of the fuel manifold (26).

10. The bracket of claim 8, characterized in that the air chamber (24) formed as a single part with your finger (40) and the transverse protrusion (50).

11. The Plenum bracket stabilizer flame containing the open end and the opposite end is formed together with the essentially axial finger (40), characterized in that the finger is annular ledge (42)intended for the support on the base.

12. Ventilatio the Naya Luggage in claim 11, characterized in that it is formed with a transverse ledge (50)containing a through hole (56), whose axis is essentially parallel to the longitudinal axis of this Plenum.

13. Gas turbine engine type aircraft turbojet engine, characterized in that it contains at least one bracket stabilizer flame (10)made in accordance with paragraph 1.



 

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