IL48433A - Cooling liner for an exhaust nozzle of a jet engine fixed structure - Google Patents

Description

nt**B~vna may *m*p~nsea COOLING LINER FOR AN EKHAUST NOZZLE OF A rer £ 6iNe PiyEo STRUCTURE. housing structure 12 by a conical shaped connecting member 16. This member is attached to the outer housing by bolts 18 and extends forwardly to a point where it is connected to the inner casing by bolts 20, forming the section of a cone. An inner liner 22 is positioned around and fixedly spaced from the inner side of inner case 14. Spaced fingers 23 extend rearwardly from the end of the inner liner 22 and are formed to be resilient for a purpose to be hereinafter described.

A plurality of main flaps 30 are mounted for pivotal movement at the rear end of the outer housing structure 12. These flaps are each pivotally mounted on a bracket member 32 which extends inwardly from the end of the structure 12. An actuating arm 34 extends outwardly from each flap and movement of the arm actuates the attached main flap 30 about its pivotal mounting. Each flap 30 is pivotally mounted at a desired balance point. In one nozzle design, this location was made approximately one-third of the distance from its forward edge.

So that all the main flaps 30 are moved in unison, the free end of each of the arms 34 is connected to a unison ring 36 by a connecting link 38. A plurality of actuators 40 are mounted in the space between the housing structure 12 and the inner case 14 in front of the connecting member 16. An actuating rod 39 extends from each of the actuators 40 and is attached to the unison ring 36. The unison ring 36 is centered within and slides on track members 37 spaced around the outer housing structure 12. Each actuating rod 39 extends through an opening 41 in the connecting member 16. A nozzle control 42 connects one side of the actuator to an actuating pressure while opening the opposite side to drain thereby movably positioning the main flaps 30. An arrangement of this type is shown in U.S. Patent No. 2,815,643.

A plurality of balance flaps 50 extend forwardly of the main flaps 30. Each flap 50 has its rearward end pivotally connected to the forward end of a main flap 30 while its forward end has cylindrical means 51 thereon which is mounted for axial movement in a track means 53. Each track "means 53 is formed between a rearward extension of the inner case 14 and a rearward extending flange 15 on the connecting member 16. While a simple cylinder and track means has been shown, any type of device permitting axial movement along with a change in angular position of the balance flap 50 can be used.

A plurality of divergent flaps 60 extend rearwardly of the main flaps 30. Each flap 60 has its forward end pivotally connected to the rearward end of a main flap 30 while its rearward end is pivotally connected to the rear end of an external flap 70. Each external flap 70 has its forward end pivotally mounted at the rear end of the housin structure 12 ust rearwardl of the bracket members 32. Each of these pivotal connections can include a lost-motion movement.

Each of the annular set of flaps, the balance flaps 50, the main flaps 30, the divergent flaps 60, and the external flaps 70, have seal means positioned along adjacent side edges of cooperating flaps to prevent an excessive amount of leakage therebetween. Seal means for this type of nozzle are shown in U.S. Patent No. 3,730,436 and U.S. Patent No. 3,794,244.

The balance flaps 50, the diverging flaps 60 and the external flaps 70 can have simple seal flaps located therebetween for sealing, however, the main flaps 30 have a seal means 77 which cooperates with the main flaps 30 to provide ¾ cooling liner around the flaps which can vary to provide liner circumferential continuity while the nozzle changes position.

As seen in Fig. 2, each main flap 30 includes an inner flap member 44 which is connected by a rib member 46 along its length at the center thereof to the center of an outer flap member 48. While the rib member 46 can be continuous, it can also be made of a plurality of smaller members, in line, providing for flow therearound, or have holes therethrough. Said inner flap member 44 extends for approximately the length and width of the outer flap member 48. The rear end of each inner flap member 44 is between the inner flap member 44 and outer flap member 48 along the inner surface of divergent flaps 60. The forward end of the flap 30 receives a cooling fluid between the inner flap member 44 and outer flap member 48 from between the inner liner 22 and inner case 14 and balance flaps 50 (note airflow arrows) . This flow can be directed from any source desired. The spaced fingers 23 contact the inner surface of the inner flap members 44 at a point inwardly from the connection of actuating arms 34.

To provide for sealing between the flaps 30 and maintain a cooling liner at this point, each seal means 77 includes an inner seal member 54 which is connected by a rib member 56 along its length at the center thereof to the center" of an outer seal member 58, said inner seal member 54 extends for approximately the length and width of the outer seal member 58. Rib member 56 can also be formed with holes therein to permit flow therethrough, or of a plurality of smaller members. Outer seal member 58 is positioned with each side extending into the space between the outer flap member 48 and inner flap member 44 of each adjacent flap 30. Each inner seal member 54 extends over the inner face of the adjacent portion of the adjacent inner flap members 44. This arrangement places the inner flap member 44 of each main flap 30 extending ΐ between the inner seal member 54 and outer seal member 58 i of the adjacent seal means 77. flap member 48A. The projections of each set are located on each side of a guide, or rib, 98 on the seal means 77A.

In a construction shown in Fig. 3 the main flap 30B can be constructed as shown in Fig. 7 with each half of the inner flap member 44B being comprised of a separate member pivotally mounted at an edge to the center of the inner surface of the outer flap member 48B, each half of the inner flap member 44B being pivotally movable independently of each other. This can be done in the manner of a piano hinge. The flap means 77B would be constructed in the same manner as it was in Fig. 3.

In the modification shown in Fig. 3 each half of the inner flap member 44 extending outwardly from the rib member 46 can be made with a degree of flexibility which will provide the desired contact between the flaps 30 and the seal means 77.

Claims (1)

1. 3. A combination as set forth in Claim 2 wherein said guide means includes a laterally extending rib connected to said outer seal member and two spaced projections extending from each adjacent flap, said projections being placed on each side of a rib. 4. A combination as set forth in Claim 2 wherein said guide means includes a laterally extending rib on the inner surface of the outer seal member and two spaced projections extending from the outer surface of the inner flap member, said projections being placed on each side of the rib. 5. A combination as set forth in Claim 1 wherein said flaps "are "convergent flaps, divergent flaps extending rearwardly of said convergent flaps, said divergent flaps having their forward ends pivotally mounted to the rearward ends of said convergent flaps, said divergent flaps also being pivotally connected downstream of their forward ends to said fixed structure, said coolant flow being directed from said passageway outlet over the inner surface of said divergent flaps . 6. A combination as set forth in Claim 5 wherein the rearward end of each divergent flap is pivotally connected to said fixed structure through a connecting member. 7. A combination as set forth in Claim 2 wherein said outer seal member extends between the inner flap member and outer flap member of each adjacent flap, said guide means being positioned between said outer seal member and said inner flap member. 8. A combination as set forth in Claim 6 wherein said connecting member is a third flap. 9. A combination as" set forth in Claim 1 wherein a cooling liner extends around said exhaust duct forming an annular duct, means for directing a coolant into the annular duct, said means for directing a coolant into the inlet of said passageway including a connecting means between said annular duct and said inlet of said passageway. 10. A combination as set forth in Claim 9 wherein said connecting means includes a sealing means between the exhaust duct and the inner flap member and inner seal member. \ 11. A combination as set forth in Claim 10 wherein said I connecting means includes a second sealing means between the i cooling liner and the outer flap member and outer seal member 12. A combination substantially as hereinbefore described with reference to and as illustrated in the accompanying drawi