Data record for performance data that describe volume flow rate versus
pressure rise.
The volume flow rate V_flow must be increasing, i.e.,
V_flow[i] < V_flow[i+1].
Both vectors, V_flow and dp
must have the same size.
This record is identical to
Annex60.Fluid.Movers.BaseClasses.Characteristics.flowParameters,
except that it takes the size of the array as a parameter. This is required
in Dymola 2014. Otherwise, the array size would need to be computed in
Annex60.Fluid.Movers.BaseClasses.FlowMachineInterface
in the initial algorithm section, which is not supported.