Silencer

Abstract

In a silencer ( 1 ) for a flow passage ( 2 ) of a turbomachine, in particular of a power plant, a plurality of walls ( 2 ) are arranged in the flow passage ( 3 ), extend parallel to a gas flow ( 4 ) directed in the flow passage ( 3 ), and are spaced apart transversely to the direction of the gas flow ( 4 ). The walls ( 2 ) are designed so as to absorb airborne noise. In order to reduce the vibration tendency of the walls ( 2 ), at least one of these walls ( 2 ) is provided with at least one connecting passage ( 9 ) which passes completely through the wall ( 2 ) transversely to the direction of flow.

1 . A silencer for a flow passage of a turbomachine, the flow passage defining a gas flow direction, the silencer comprising: 
 a plurality of walls arranged in the flow passage, extending parallel to the gas flow direction, and spaced apart transverse to the gas flow direction, the plurality of walls configured and arranged to absorb airborne noise; and    at least one of the plurality of walls comprising at least one connecting passage which passes completely through the at least one of the plurality of walls transverse to the gas flow direction.    
   
   
       2 . The silencer as claimed in  claim 1 , wherein the at least one connecting passage comprises two open ends.  
   
   
       3 . The silencer as claimed in  claim 1 , wherein the at least one connecting passage has a clear width cross section between 0.5 to 1.5 times a wall thickness of said at least one of the plurality of walls.  
   
   
       4 . The silencer as claimed in  claim 1 , wherein the at least one connecting passage has a circular cross section.  
   
   
       5 . The silencer as claimed in  claim 1 , wherein the at least one of the plurality of walls comprises a damper material configured and arranged to absorb airborne noise and a perforated outer skin which encloses the damper material, and wherein the at least one connecting passage passes through the perforated outer skin and the damper material.  
   
   
       6 . The silencer as claimed in  claim 1 , wherein the at least one of the plurality of walls comprises a casing that lines the at least one connecting passage.  
   
   
       7 . The silencer as claimed in  claim 6 , wherein the at least one of the plurality of walls comprises a damper material configured and arranged to absorb airborne noise and a perforated outer skin which encloses the damper material, and wherein the at least one connecting passage passes through the perforated outer skin and the damper material; and 
 (a) wherein the casing separates the at least one connecting passage from the damper material, from the outer skin, or from both; or    (b) wherein the casing is fastened to the outer skin; or    both (a) and (b).    
   
   
       8 . The silencer as claimed in  claim 1 , wherein the at least one of said plurality of walls comprises a plurality of connecting passages arranged in a distributed manner side by side transversely to the gas flow direction, or arranged one behind the other in the gas flow direction, or both.  
   
   
       9 . The silencer as claimed in  claim 1 , wherein: 
 the damper material comprises mineral wool or a foam plastic; or    the outer skin comprises a sheet or a perforated sheet; or    both.    
   
   
       10 . The silencer as claimed in  claim 1 , wherein the turbomachine includes an inlet and an outlet, and wherein the flow passage is configured and arranged to direct the gas flow to said turbomachine inlet or away from said turbomachine outlet.  
   
   
       11 . The silencer as claimed in  claim 1 , further comprising: 
 at least one vibratory diaphragm closing the at least one connecting passage.    
   
   
       12 . A turbomachine comprising: 
 a flow passage; and    a silence according to  claim 1  positioned in the flow passage.    
   
   
       13 . A power plant comprising: 
 a turbomachine according to  claim 12.