Duct With Friction - GasTurb

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Duct With Friction

In a constant area duct with friction the exit number increases with duct inlet Mach number until the duct exit chokes. A series of friction pressure loss points with duct exit Mach numbers from subsonic to supersonic plotted in the temperature-entropy diagram is called the Fanno line.

The total pressure loss in a constant area duct with friction depends on the inlet Mach number and the dynamic head loss coefficient cld. The duct total pressure at the duct exit is calculated as P
2 = P1-cld * (P1 - Ps1).

 
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