Compressor flow extrapolation and library design for the modelica vehicle propulsion library - VehProLib
Modelbased systems engineering is becoming an important tool when
meeting the challenges of developing the complex future vehicles
that fulfill the customers and legislators ever increasing demands for
reduced pollutants and fuel consumption. To be able to work
systematically and efficiently it is desirable to have a library of
components that can be adjusted and adapted to each new situation.
Turbocharged engines are complex and the compressor model serves
as an in-depth example of how a library can be designed,
incorporating the basic physics and allowing fine tuning as more
information becomes available. A major part of the paper is the
summary and compilation of a set of rules of thumb for compressor
map extrapolation. The considerations discussed are extrapolation to
surge, extrapolation to restriction region, and extrapolation out to
choking. Furthermore the compressor diameter is coupled to the
maximum performance of the compressor such as maximum speed,
mass flow, and pressure ratio. All this is a result of an analysis of a
database of more than 300 compressors. The paper uses the
compressor modeling to discuss how wishes for extendability and
reuse of component performance influences the library design. A
Modelica library named Vehicle Propulsion Library VehProLib has
been developed to meet these goals by including basic components
that give a starting point for modeling and at the same time allows
reuse and extendablility.
Lars Eriksson, Vaheed Nezhadali and Conny Andersson
2016
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