Patent ID: 11927134
Assignee: GENERAL ELECTRIC COMPANY
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A gas turbine engine defining a centerline and a circumferential direction, the gas turbine engine comprising:
a turbomachine comprising a compressor section, a combustion section, and a turbine section arranged in serial flow order;
a rotor assembly driven by the turbomachine and operable at a first blade passing frequency (f1) greater than or equal to 2,500 hertz and less than or equal to 5,000 hertz during a high power operating condition, the rotor assembly, the turbomachine, or both comprising a substantially annular duct relative to the centerline of the gas turbine engine, the substantially annular duct defining a flowpath;
a heat exchanger positioned within the annular duct and extending substantially continuously along the circumferential direction, the heat exchanger comprising a first material defining a heat exchange surface exposed to the flowpath, wherein the first material defines a heat exchange coefficient and wherein the heat exchange surface defines a surface area (A), wherein a product of the heat exchange coefficient and the surface area, UA, is between 7500 British thermal units per hour per degrees Fahrenheit (Btu/(hr-° F.)) and 45000 Btu/(hr-° F.);
wherein an effective transmission loss (ETL) for the heat exchanger positioned within the annular duct is between 5 decibels and 1 decibels for the high power operating condition,
wherein ETL equals, C
      1
    
    ⁢
    
      e
      
        -
        
          
            C
            2
          
          ⁡
          
            (
            
              
                EOC
                -
                UA
              
              
                C
                3
              
            
            )
          
        
      
    
  
  ;

wherein when the operating condition is the high power operating condition, C1 equals 21.02, C2 equals 0.027, C3 equals 107, and EOC is between 50,347 and 12,587; and
wherein the heat exchanger comprises a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equ al to 0.75, the OARR equal to:, sin
  ⁢
  
    
  
  ⁢
  
    
      (
      
        
          
            2
            ×
            π
            ×
            
              
            
            ⁢
            
              f
              1
            
          
          
            a
            1
          
        
        ×
        
          L
          i
        
      
      )
    
    2
  

wherein a1 is equal to 13,200 inches per second during the high power operating condition.