Exhaust stack having a co-axial silencer

Abstract

An exhaust stack includes an inlet section extending along a first axis and an outlet section extending along a second axis. A co-axial silencer is arranged in one of the inlet section and outlet section. The co-axial silencer includes a plurality of concentric baffles configured and disposed to absorb acoustics generated by fluid flow through the exhaust stack.

What is claimed is: 
     
         1 . An exhaust stack comprising:
 an inlet section extending along a first axis;   an outlet section extending along a second axis; and   a co-axial silencer arranged in one of the inlet section and outlet section, the co-axial silencer including a plurality of concentric baffles configured and disposed to absorb acoustics generated by fluid flow through the exhaust stack.   
     
     
         2 . The exhaust stack according to  claim 1 , wherein each of the plurality of concentric baffles includes a substantially constant diameter. 
     
     
         3 . The exhaust stack according to  claim 1 , wherein each of the plurality of concentric baffles taper from a first end to a second end. 
     
     
         4 . The exhaust stack according to  claim 3 , wherein each of the plurality of concentric baffles taper outwardly from the first end to the second end. 
     
     
         5 . The exhaust stack according to  claim 4 , wherein the first end defines an inlet of the co-axial silencer. 
     
     
         6 . The exhaust stack according to  claim 1 , wherein the plurality of concentric baffles extend about a central member. 
     
     
         7 . The exhaust stack according to  claim 6 , wherein the central member is formed from an acoustic attenuating material. 
     
     
         8 . The exhaust stack according to  claim 6 , wherein the central member includes a substantially constant diameter. 
     
     
         9 . The exhaust stack according to  claim 1 , wherein the co-axial silencer is arranged in the inlet section. 
     
     
         10 . The exhaust stack according to  claim 1 , wherein the co-axial silencer is arranged in the outlet section. 
     
     
         11 . A turbomachine comprising:
 a compressor portion;   a turbine portion operatively connected to the compressor portion, the turbine portion including an exhaust outlet;   a combustor assembly including at least one combustor fluidically connected to the compressor portion and the turbine portion; and   an exhaust stack fluidically connected to the exhaust outlet of the turbine portion, the exhaust stack comprising:
 an inlet section extending along a first axis; 
 an outlet section extending along a second axis; and 
 a co-axial silencer arranged in one of the inlet section and outlet section, the co-axial silencer including a plurality of concentric baffles configured and disposed to absorb acoustics generated by fluid flow through the exhaust stack. 
   
     
     
         12 . The turbomachine according to  claim 11 , wherein each of the plurality of concentric baffles includes a substantially constant diameter. 
     
     
         13 . The turbomachine according to  claim 11 , wherein each of the plurality of concentric baffles taper from a first end to a second end. 
     
     
         14 . The turbomachine according to  claim 13 , wherein each of the plurality of concentric baffles taper outwardly from the first end to the second end. 
     
     
         15 . The turbomachine according to  claim 11 , wherein the co-axial silencer is arranged in the inlet section. 
     
     
         16 . A turbomachine system comprising:
 a compressor portion;   a turbine portion operatively connected to the compressor portion, the turbine portion including an exhaust outlet;   a combustor assembly including at least one combustor fluidically connected to the compressor portion and the turbine portion;   a generator operatively connected to the compressor portion; and   an exhaust stack fluidically connected to the exhaust outlet of the turbine portion, the exhaust stack comprising:
 an inlet section extending along a first axis; 
 an outlet section extending along a second axis; and 
 a co-axial silencer arranged in one of the inlet section and outlet section, the co-axial silencer including a plurality of concentric baffles configured and disposed to absorb acoustics generated by fluid flow through the exhaust stack. 
   
     
     
         17 . The turbomachine system according to  claim 16 , wherein each of the plurality of concentric baffles includes a substantially constant diameter. 
     
     
         18 . The turbomachine system according to  claim 16 , wherein each of the plurality of concentric baffles taper from a first end to a second end. 
     
     
         19 . The turbomachine system according to  claim 18 , wherein each of the plurality of concentric baffles taper outwardly from the first end to the second end. 
     
     
         20 . The turbomachine system according to  claim 16 , wherein the co-axial silencer is arranged in the inlet section.