DAMPER FOR GAS TURBINE

Abstract

The invention relates to a damper for reducing pulsations in a gas turbine, which includes an enclosure, a main neck extending from the enclosure, a spacer plate disposed in the enclosure to separate the enclosure into a first cavity and a second cavity and an inner neck with a first end and a second end, extending through the spacer plate to interconnect the first cavity and the second cavity. The first end of the inner neck remains in the first cavity and the second end remains in the second cavity. A flow deflecting member is disposed proximate the second end of the inner neck to deflect a flow passing through the inner neck. With the solution of the present invention, as a damper according to embodiments of the present invention operates, flow field hence damping characteristic in the second cavity constant regardless the adjustment of the spacer plate in the enclosure.

Claims

1. A damper for reducing pulsations in a gas turbine, the damper comprising: an enclosure; a spacer plate disposed in the enclosure to separate the enclosure into a first cavity and a second cavity; a main neck extending from the second cavity of the enclosure; an inner neck with a first end and a second end, the inner neck extending through the spacer plate to interconnect the first cavity and the second cavity, wherein the first end of the inner neck remains in the first cavity and the second end remains in the second cavity; and a flow deflecting member is disposed proximate the second end of the inner neck to deflect a flow passing through the inner neck, wherein the flow deflecting member comprises at least one guiding tube disposed proximate the second end of the inner neck, wherein an outlet of the guiding tube is configured to direct a flow at an angle shifted from a longitudinal axis of the inner neck, wherein the outlet of the guiding tube is configured to direct the flow at the angle ranging from greater than 0 to 90 degrees shifted from the longitudinal axis of the inner neck.

2. The damper according to claim 1, wherein the outlet of the guiding tube is configured to direct the flow at the angle ranging from 45 degrees shifted from the longitudinal axis of the inner neck.

3. The damper according to claim 1, wherein the guiding tube is arranged as a quarter of a ring.

4. The damper according to claim 1, wherein the second end of the inner neck is blinded or plugged.

5. The damper according to claim 3, wherein the second end of the inner neck is blinded or plugged.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The objects, advantages and other features of the present invention will become more apparent upon reading of the following non-restrictive description of preferred embodiments thereof, given for the purpose of exemplification only, with reference to the accompanying drawing, through which similar reference numerals may be used to refer to similar elements, and in which:

[0017] FIG. 1 shows an elevation side view of a damper according to one example embodiment of the present invention;

[0018] FIG. 2 is an elevation side view of a damper according to another example embodiment of the present invention;

[0019] FIG. 3 is a section taken along the line A-A in FIG. 1 showing the arrangement of the guiding tubes;

[0020] FIG. 4 is an elevation side view of a damper according to an alternative embodiment of the present invention; and

[0021] FIG. 5 is an elevation side view of a damper according to another alternative embodiment of the present invention.

DETAILED DESCRIPTION

[0022] FIG. 1 shows an elevation side view of a damper 100 according to one example embodiment of the present invention. The damper 100 comprises an enclosure 150 with an inlet tube 102 to function as the resonator; a main neck 140 extending from the enclosure 150 for communicating the enclosure 150 and a combustion chamber of a gas turbine, not shown; a spacer plate 130 disposed in the enclosure 150 to separate the enclosure into a first cavity 160 and a second cavity 170; an inner neck 110 with a first end 112 and a second end 114, extending through the spacer plate 130 to interconnect the first cavity 160 and the second cavity 170, wherein the first end 112 of the inner neck 110 remains in the first cavity 160 and the second end 114 remains in the second cavity 170.

[0023] It should be noticed by those skilled in the art that the spacer plate 130 may be fixed in the enclosure 150, in which case the volume of the first cavity 160 and the second cavity 170 remain constant hence the resonant frequency they may reduce, or be movably disposed in the enclosure 150, in which case the volume of the first cavity 160 and the second cavity 170 may be adjusted by means of known method. The inlet tube 102 of the enclosure 150 communicates a plenum outside the enclosure 150 and the first cavity 160 in order to provide a flow path for a fluid entering and exiting the enclosure 150. Those skills in the art should understand that, the damper 100 may more than one main neck 140, and/or more than one inner neck 110, and/or more than two cavities 160, 170 in accordance with particular actual applications.

[0024] According to embodiments of the present invention, the damper 100 comprises a flow deflecting member disposed proximate the second end 114 of the inner neck 110 to deflect a fluid flow passing through the inner neck 110. It should be recognized by those skilled in the art that, as used herein, the term proximate the second end covers the meaning of near the second end and/or at the second end. As shown in FIG. 1, the flow deflecting member may be embodied to be a hole 116 disposed on the peripheral surface of the inner neck 110 proximate the second end 114 thereof. In this case, the second end 114 of the inner neck 110 may be blinded or plugged in order to prevent fluid leakage therefrom. When the damper 100 is operated, the fluid coming through the inner neck 110 from the first end 112 thereof will exist therefrom by way of the hole 116 that directs sideway from the inner neck 110, which will keep the flow field hence damping characteristic in the second cavity 170 constant regardless the adjustment of the spacer plate 130 in the enclosure 150.

[0025] According to a preferable embodiment of the present invention, the flow deflecting member may comprises a plurality of holes 116 evenly spaced around the peripheral surface of the inner neck 110 proximate the second end 114 thereof. For example, even not shown, the flow deflecting member may comprise two holes 116 diametrically disposed on the peripheral surface of the inner neck 110 proximate the second end 114 thereof. As another example, not shown, the flow deflecting member may comprise four holes 116 disposed and spaced by 90 degree, i.e. evenly, around the peripheral surface of the inner neck 110 proximate the second end 114 thereof. At a particular situation, the adjoining portion between adjacent holes 116 may be simplified to be studs extending from the second end 114 of the inner neck 110, and the terminal of the inner neck 110 at the second end 114 may be regarded as an end cap supported by the four studs.

[0026] FIG. 2 is an elevation side view of a damper 100 according to another example embodiment of the present invention. The damper shown in FIG. 2 is different from that shown in FIG. 1 in that the flow deflecting member takes different structures. The rest of the structure of the damper 100 as shown in FIG. 2 is similar to that of the damper 100 as shown in FIG. 1. As shown in FIG. 2, the flow deflecting member comprises at least one guiding tube 118 disposed at a first end 120 thereof on the peripheral surface proximate the second end 114 of the inner neck 110, wherein an outlet of the guiding tube 118, i.e., a second end 122, as shown in FIG. 3, directs at an angle 90 degree shifting from the longitudinal axis of the inner neck 110. That is, the outlet of the guiding tube 118 radially directs outwards. It should be understood by those skilled in the art that an angle shifting from the longitudinal axis of the inner neck, when it is mentioned herein, refers to the angle between the direction running from the second end 114 of the inner neck 110 to the first end 112 of the inner neck 110 and the direction to which the free end of the flow deflecting member faces. As an alternative of the flow deflecting member as shown in FIG. 2, the guiding tube 118 may be integrated at the first end 120 thereof with the inner neck 110 at the second end 114 thereof, in order to make a one-piece structure that may function the same as the flow deflecting member, even this is not shown in the drawings. In this case, the flow deflecting efficiency of the flow deflecting member may be improved due to stronger guiding capacity introduced by the tube shape structures. Hence, the flow field produced in the second cavity 170 will be further maintained stable.

[0027] FIG. 3 is a section taken along the line A-A in FIG. 1 showing the arrangement of the guiding tubes 118. According to a preferable embodiment of the present invention, the flow deflecting member may comprises four guiding tubes 118 evenly spaced around the peripheral surface of the inner neck 110, and disposed on the peripheral surface proximate the second end 114 of the inner neck 110. In this case, similar like the case shown in FIG. 1, the second end 114 of the inner neck 110 may be blinded or plugged in order to prevent fluid leakage therefrom.

[0028] FIG. 4 is an elevation side view of a damper 100 according to an alternative embodiment of the present invention. The damper 100 as shown in FIG. 4 is generally similar to the damper 100 as shown in FIG. 2. The damper 100 as shown in FIG. 4 differs in that the outlet of the guiding tube 118 direct at an angle of 45 degree shifting from the longitudinal axis of the inner neck 110, i.e., e=45. In this case, similar like the case shown in FIG. 1, the second end 114 of the inner neck 110 may be blinded or plugged in order to prevent fluid leakage therefrom. According to a preferable embodiment of the present invention, not shown, the flow deflecting member may comprises two or four guiding tubes 118 evenly spaced around the peripheral surface of the inner neck 118, and disposed on the peripheral surface proximate the second end 114 of the inner neck 110.

[0029] FIG. 5 is an elevation side view of a damper 100 according to another alternative embodiment of the present invention. The damper 100 as shown in FIG. 5 is generally similar to the damper 100 as shown in FIG. 2. The damper 100 as shown in FIG. 5 differs in that the guiding tube 118 consists of a quarter of a ring tube with the first end 120 attached to the peripheral surface of the inner neck 100 proximate to the second, end 114 thereof and the second end 122 directs to the spacer plate 130, i.e., reversely. In other words, the outlet of the guiding tube 118 directs at the angle of 0 degree shifting from the longitudinal axis of the inner neck 110. According to a preferable embodiment of the present invention, not shown, the flow deflecting member may comprise two or four guiding tubes 118 evenly spaced around the peripheral surface of the inner neck 118, and disposed on the peripheral surface proximate the second end 114 of the inner neck 110. In this case, similar like the case shown in FIG. 1, the second end 114 of the inner neck 110 may be blinded or plugged in order to prevent fluid leakage therefrom.

[0030] As a simple alternative embodiment, not shown, the guiding tube 118 as shown in FIG. 5 may integrate at the first end 120 thereof with the inner neck at the second end 114 thereof. This structure may even apply to the case that the flow deflecting member comprises a plurality of guiding members 118 as shown in FIG. 5.

[0031] It should be noticed by those skilled in the art that, where necessary, the outlet of the guiding tube 118 may be determined in the range from 0 to 90 degrees shifting from the longitudinal axis of the inner neck 110, in order to adjust the flow field produced therefrom.

[0032] While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.