Hydrodynamic Noise: IEC Standard - Intergraph Smart Instrumentation - Reference - Hexagon

*D2 [m], P1 [Pa-a], P2 [Pa-a], PV [Pa-a], Pc [Pa-a], W[kg/s]

1. Calculate the downstream speed of sound:

   

2. Calculate characteristic pressure ratio:

   

3. Calculate Differential pressure ratio

   

4. Calculate Ring frequency

   

5. Calculate Internal sound power level

   • Case Xr<Xfz - Non-cavitating flow

     

   • Case Xf=> Xfz - Cavitating flow

   1. Calculate Liquid critical pressure ratio factor

      1. 

   2. Calculate Differential pressure

      1. 

      2. 

   3. Calculate Lwi

      

6. Calculate Un-weighted extenral sound power levels

   

   

   

   

   

7. Calculate External A-weighted sound power level

   

8. Calculate External A-weighted sound pressure level