Effects of non ideal inlet and outlet pipes on measured compressor efficiency
The thesis is about investigating the inlet and outlet pipes effect on the compres-
sors measured performance. From measurements made in a gas stand, a ther-
modynamic model is to be created and the compressor efficiency further investi-
gated. The temperatures and pressures entering and leaving the compressor does
not have to be the same as the temperatures measured in the gasstand, because
of the thermodynamics of the pipes that connects the measurement equipment
and the compressor. During a gasstand test the turbocharger is connected in a
test bench, it is connected with pipes on both the compressor and turbine side,
to simulate the hot exhaust gases from the car engine and the pressure increase
over the compressor. The air entering and leaving the turbocharger through the
different pipes is controlled and all the entering and leaving temperatures and
pressures are measured. Gasstand data from different tests are available during
the thesis, one specific turbocharger is used as references during the modeling.
Models of the inlet and outlet pipes are created and connected to a compressor
model. The model is controlled to give the same mass flow as the measured data,
to ensure that the work cycle is followed. The effects of the non ideal inlet and
outlet pipes on measured compressor efficiency is studied with help of this model
and the main impacts on the measured compressor efficiency are discovered. The
result shows that the measured values used to calculate the compressor efficiency
could change, depending on the measurement positions on the inlet and outlet
pipes.
Kristoffer Ekberg
2015
Informationsansvarig: webmaster
Senast uppdaterad: 2021-11-10
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