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Restrictor, Enlargement
The geometry of an enlargement is shown in Figure 60. It is described by the following constants (to be specified in that order on the line beneath the *FLUID SECTION, TYPE=RESTRICTOR ENLARGEMENT card):
- reduced cross section
.
- full cross section
.
- hydraulic diameter
defined by 
where 
is the
perimeter of the cross section.
- oil mass flow in the restrictor (only if the OIL parameter is used to define the kind of oil in the *FLUID SECTION card)
The loss coefficient for an enlargement is taken from [28].
By specifying the parameter LIQUID on the *FLUID SECTION card the loss is calculated for liquids. In the absence of this parameter, compressible losses are calculated.
Example files: piperestrictor, restrictor, restrictor-oil.
guido dhondt 2011-03-26