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مکانیک::
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The whirl frequency ratio is expressed by f (k/C).
The whirl frequency ratio is negative for labyrinth seal with shunt injection, and is caused by the negative cross-coupled stiffness.
Whirl frequency ratio
In an experiment conducted at NASA's Marshall Space Flight Center, test measure- ments focused on the capacity of annular damping seals to minimize the whirl frequency ratio in the presence of a highly prerotated fluid at the inlet (Darden, Earhart, and Flowers, 1999).
The whirl frequency ratio is given by k/(Cs), and is overpredicted by 20 percent for the low-preswirl condition.
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