Abstract
The generalized incorporation of the turbocharging to the automotive
diesel engines makes essential to develop an investigation level able to deepen
in the parameters that influence the performance and the efficiency of the
turbochargers fitted to internal combustion engines.
In this thesis are presented two different tools, which allow the
improvement of the knowledge about turbochargers, and specifically variable
geometric turbines. Firstly, the thesis shows the design and the construction
of a turbocharger test bench which allows a wider knowledge, as much
theoretical as experimental, about the physical phenomena that happen in
design conditions or other conditions. This knowledge about the fluiddynamic
behaviour will held the model development.
In the second part of this thesis, a uni-dimensional fluid-dynamic
model to calculate radial variable geometric turbines is presented. This model
has been set up in a wave action model which reproduces the fluid-dynamic
behaviour of reciprocating internal combustion engines. The model has been
checked with experimental data obtained in the test bench developed in the
first part of this work and in steady and transient engine conditions.