Turbo Heat Transfer Modelling for Control
The demand for lower emission engines forces the car industry to build more
efficient engines. Turbocharged engines are on the rise, and better understanding
of the heat transfer and efficiency of the turbocharger is needed to build better
ones. A lot is known about the overall efficiency of the turbocharger, but not
much is known about where the heat losses are located and how they interact
with each other.
This thesis presents a one dimensional model for heat exchange in the turbocharger
and investigates how the heat flows from the hot exhaust gases to
the cold intake air. Data is gathered by performing tests on a single scroll turbocharger
in an engine test bench at Linköping University. The tests are focused
on operating points where the air mass flow is low and neither the compressor
nor the turbine works adiabatically.
The results show that it is possible to estimate the heat flows together with
the efficiency of the turbine and compressor using only known parameters, eliminating
the need to add any new sensors to the engine.
Anton Nordlöf and John Lundqvist
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Last updated: 2021-11-10