All the provided data make possible the correct computation of
the model parameters in order to use it coupled with GT-Power, in a
similar way to the work done in Ref. [26] in which only gas stand
data have been analysed. The procedure is outlined in Fig. 3, which
shows that HT&ML model is built on the basis of thermal properties
and heat transfer correlations for convection. Those correlations
have been obtained from test campaigns on both thermohydraulic
test bench and gas stand and from turbocharger simple geometrical
data (detailed geometry is not needed). The model for a given
turbocharger is programmed in an external library for further use.
It is important to take into account that the HT&ML model coupled
with the engine model uses adiabatic compressor and turbine
performance maps. These maps can be obtained from direct adiabatic
measurements or from supplier (or hot) maps using the
HT&ML in the inverse form, i.e. removing the heat from the
measured hot map [23]. For that inverse use additional information
about map measurement conditions (temperatures, mass flows,
etc.) is needed. Using the described arrangement, simulations in
GT-Power can be performed taking into account the turbocharger
heat transfer and mechanical losses model and using on engine test
data for boundary conditions definition