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

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

*FL=FLP/Fp

1. Calculate the downstream parameters:

   

2. Calculate the following pressures:

   

3. Calculate Fd,Dj, Mj

   

4. Now 5 regimes are possible:

   1. Regime I - P1 > P2 > P2c

   

   1. Common calculations for II - V Regimes:

      

   2. Regime II - P2c > P2 > Pncc:

   

   1. Regime III - Pncc > P2 > P2b:

   

   1. Regime IV - P2b > P2 > P2ce:

   

   1. Regime V - P2ce > P2 > 0:

   

5. Calculate Lpi:

   

6. Calculate TLƒr:

   

7. Calculate ƒr and ƒo:

   

8. Three cases are possible when calculating DTLfp:

   1. 

   2. 

   3. 

9. Calculate transmission lost:

   

10. Calculate Lg:

    

11. Calculate sound level at the outside diameter of the pipe:

    

12. Calculate sound level at a distance of 1m from the pipe wall: