The subject matter disclosed herein relates to the art of turbomachines and, more particularly, to a turbomachine combustor including a vortex modification system.
In general, gas turbine engines combust a fuel/air mixture that releases heat energy to form a high temperature gas stream. The high temperature gas stream is channeled to a turbine via a hot gas path. The turbine converts thermal energy from the high temperature gas stream to mechanical energy that rotates a turbine shaft. The turbine may be used in a variety of applications, such as for providing power to a pump or an electrical generator.
Many gas turbines include an annular combustor within which are formed the combustion gases that create the high temperature gas stream. Other turbomachines employ a plurality of combustors arranged in a can-annular array. In such a turbomachine, the combustion gases are formed in each of the plurality of combustors, combusted in a combustion chamber defined by a combustor body, and delivered to the turbine through a transition piece. Often times, compressor discharge air is passed into the combustor to cool various surfaces and aid in forming the fuel/air mixture. In certain arrangements, compressor discharge air is often channeled along a combustor liner toward a venturi.
A portion of the compressor discharge air is directed onto internal surfaces of the venturi for cooling. The compressor discharge air passes from the venturi into a passage formed between the combustor body and the combustor liner. In certain arrangements, a plurality of turbulator members is arranged in the passage. The turbulator members create flow vortices that enhance heat transfer in the combustor body. The compressor discharge air exits the passage into the combustion chamber to mix with the combustion gases.
According to one aspect of the exemplary embodiment, a turbomachine combustor assembly includes a combustor body, and a combustor liner arranged within the combustor body and defining a combustion chamber. The combustor liner includes a venturi portion arranged within the combustion chamber. A fluid passage is defined between the combustor body and the combustor liner, and at least one turbulator is arranged in the fluid passage. The at least one turbulator is configured and disposed to create vortices in the fluid passage. A vortex modification system is arranged at the fluid passage and is configured and disposed to disrupt the vortices.
According to another aspect of the exemplary embodiment a turbomachine includes a compressor portion, a turbine portion, and a combustor assembly fluidly connecting the compressor portion and the turbine portion. The combustor assembly includes a combustor body, and a combustor liner arranged within the combustor body and defining a combustion chamber. The combustor liner includes a venturi portion arranged within the combustion chamber. A fluid passage is defined between the combustor body and the combustor liner, and at least one turbulator is arranged in the fluid passage. The at least one turbulator is configured and disposed to create vortices in the fluid passage. A vortex modification system is arranged at the fluid passage and is configured and disposed to disrupt the vortices.
According to yet another aspect of the exemplary embodiment, a method of mitigating undesirable noise in a combustor assembly with compressor discharge air includes passing compressor discharge air into a venturi portion arranged within the combustor assembly, guiding the compressor discharge air across interior surfaces of the venturi portion to provide cooling, passing the compressor discharge air from the venturi portion into a fluid passage defined in the combustor assembly, creating vortices in the compressor discharge air passing through the fluid passage to facilitate heat exchange, and disrupting the vortices in the compressor discharge air to minimize undesirable noise in the combustor assembly.
These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
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In the exemplary embodiment shown in
As further shown in the exemplary embodiment, a plurality of turbulators 80 is arranged on venturi wall 64. Turbulators 80 extend between an upstream end turbulator 81 and a downstream end turbulator 82. Turbulators 80 create vortices in the portion of compressor discharge air passing through fluid passage 74. The vortices enhance heat transfer between venturi wall 64 and combustor liner 43. However, the vortices have been shown to create undesirable high frequency noise in combustor assembly 20. In order to mitigate the undesirable noise, combustor assembly 20 includes a vortex modification system 86. In accordance with the exemplary aspect shown, vortex modification system 86 includes a jet member 90 formed in combustor liner 43 and positioned downstream from downstream end turbulator 82. Jet member 90 directs a stream of fluid at the portion of combustor discharge air passing through fluid passage 74. The fluid passing from jet member 90 disrupts the vortices imparted to the portion of combustor discharge air created by turbulators 80 to mitigate undesirable noise in combustor assembly 20.
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In addition, a spacing between the first plurality of turbulators 183-188 and the second plurality of turbulators 194-195 is varied to further disrupt vortices in fluid passage 74. Of course it should be understood that spacing between adjacent ones of the first plurality of turbulators 183-188 and/or between adjacent ones of the second plurality of turbulators could also vary. The second plurality of turbulators along with the varied spacing between turbulators collectively operate to disrupt the first plurality of vortices in order to mitigate the creation of undesirable noise in combustor 20 while also ensuring a desired heat transfer from venturi wall 64 to combustor liner 43.
At this point it should be understood that the exemplary embodiment provides a system that not only generates vortices in a combustor fluid passage to enhance heat transfer, but also a system for disrupting those vortices to mitigate noise in the combustor. It should also be understood that the number of turbulators could vary. It should be further recognized that the number, size and shape of vortex modifying turbulators could also vary.
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.
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