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Restrictor, Contraction
The geometry of a contraction is shown in Figure 61. It is described by the following constants (to be specified in that order on the line beneath the *FLUID SECTION, TYPE=RESTRICTOR CONTRACTION card):
- full cross section
.
- reduced cross section
.
- hydraulic diameter
defined by 
where 
is the
perimeter of the cross section.
- chamfer length
.
- chamfer angle
.
- 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 a contraction 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