Aerodynamic Noise: ISA Standard - Intergraph Smart Instrumentation - 13.1 - Reference - Hexagon PPM

Integraph Smart Instrumentation Sizing Equations

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Intergraph Smart Instrumentation
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Reference
Smart Instrumentation Version
13.1

*D2 [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

    2. Common Calculations for Regimes II to V:

    3. Regime II - P2c > P2 > Pncc:

    4. Regime III - Pncc > P2 > P2b

    5. Regime IV - P2b > P2 > P2ce

    6. Regime V - P2ce > P2 > 0

  5. Calculate Lpi:

  6. Calculate TLƒo:

  7. Calculate ƒo:

  8. Three cases are possible when Calculating DTLfp:

  9. Calculate transmission loss:

  10. Calculate Lg:

  11. Calculate sound level