Patent ID: 11931199
Assignee: nan
Field: Other consumer goods (Other fields)
Classification: CPC A  G | IPC A  B  F  G

Claim 5:
6. A sound-silencer [3.A];
the sound-silencer comprising the acoustic nozzle of claim 1, wherein the inner canal is configured as a convergent-divergent pipe comprising:
a converging funnel having the open sound-inlet [3.A1],
a divergent exhaust tailpipe having the open sound-outlet [3.A2], and
a narrow throat [3.A4] between the converging funnel and divergent exhaust tailpipe;

wherein the cross-sectional profile function A(x) is further specified as a convergent-divergent cross-sectional profile function ASILENCER(x) expressed as:, A
     SILENCER
    
    (
    x
    )
   
   =
   
    
     
      A
      
       *
       SILENCER
      
     
     
      
       M
       SILENCER
      
      (
      x
      )
     
    
    ⁢
    
     
      (
      
       
        γ
        -
        1
       
       γ
      
      )
     
     
      1
      2
     
    
    ⁢
    
     
      (
      
       
        2
        +
        
         
          γ
          ⁡
          (
          
           
            M
            SILENCER
           
           (
           x
           )
          
          )
         
         2
        
       
       
        γ
        +
        1
       
      
      )
     
     
      
       γ
       +
       1
      
      
       2
       ⁢
       
        (
        
         γ
         -
         1
        
        )
       
      
     
    
   
  
  ,
  

  
   
    x
    a
   
   <
   x
   <
   
    x
    b, where xa and xb are x-coordinates of the open sound-inlet and open sound-outlet, correspondingly, MSILENCER(x) is a monotonically-decreasing gradually-smooth function of x representing an M-velocity profile of the fluid tiny portion moving within and through the convergent-divergent sound-silencer, and A*SILENCER is a constant, being lesser than both the cross-sectional area of the open sound-inlet AIN and the cross-sectional area of the open sound-outlet AOU and having a sense of a minimal cross-sectional area of the narrow throat between the converging funnel and divergent exhaust tailpipe, wherein the condition, A
    IN
   
   
    A
    
     *
     SILENCER
    
   
  
  =
  
   
    
     (
     
      
       γ
       -
       1
      
      γ
     
     )
    
    ⁢
    
     
      (
      
       
        2
        +
        γ
       
       
        γ
        +
        1
       
      
      )
     
     
      
       γ
       +
       1
      
      
       (
       
        γ
        -
        1
       
       )
      
     
    
   
  
 

is satisfied.