Carbon Seal

A carbon seal is used to prevent the gas from leaking through the space between a rotating and a static device and thus reducing the efficiency (Figure ).

**Figure:** Geometry of a carbon seal
$\begin{figure}\epsfig{file=Carbonseal.eps,width=11cm}\end{figure}$

The formula governing the flow through a carbon seal has been derived in [71]. A carbon seal is described by the following parameters (to be specified in that order on the line beneath the *FLUID SECTION,TYPE=CARBON SEAL card):

D: largest diameter of the gap
s: size of the gap between rotor and carbon ring
L: length of the carbon seal

Please look at the figure for the meaning of these parameters.

Example files: carbonseal.