Using the DLR ThermoFluidStream Library

• Basic ideas of the TFS library:
  • incorporate pressure difference due to fluid inertia
    • 
    • often neglected in quasi-static processes (MFL)
    • inertance L independent of thermodynamical state
    • in TFS generally defined as small global constant
  • steady mass flow pressure given by
    • 
    • approximate its change in a component
    • 
    • leads to decoupling of components
    • makes initialization problem feasible
  • connectors
    • 
• Specialized library PneuBibTFS:
  • mainly wrappers around TFS components
    • define medium as SimpleAir
    • reduce number of parameters
  • examples
    • Pipe, Bend
    • Tank (with inflow and outflow)
    • PressureSource, PressureSink
  • MassFlowSource, MassFlowSink
    • mass flow is state variable in TFS!
    • implemented with control valve using PT1 dynamic
    • simpler with linear valve
    • actuator = linear MassFlowSink
  • tee branches need special care