Numerical Study of the Turbulent Air Flow through the Turbocharger Compressor Using Different Rotor Shapes
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Date
2021
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Abstract
The turbulent air flow through the turbocharger
is studied, considering the full stage of the centrifugal
compressor, consisting of an air inlet, leading to an impeller
that discharges the air radially through a vaneless diffuser
in the volute. The objective of this study is the prediction of
the influence of impeller blades geometry on the flow local
characteristics (velocity and pressure) and on the local
characteristics of turbulence represented by the standard k-
ε model, for this, three types of impellers that have the same
size and the same number of blades are considered, they
differ only in inlet and exit blade angle. All simulations are
carried out for the same rotational speed of 100000 rpm,
and several points of the operating range, it is chosen for
representing the results one of these points at flow rate of
0.47 kg/s, the velocity fields is presented in the axial plane,
and transverse plan, whereas for the turbulence intensity
we show the diffuser with each type of impeller to give an
idea about the distribution of turbulence intensity in the
diffuser. It is found from the computational fluid dynamics
analysis that the rotor design presents a considerable effect
not only on the fluid flow field and turbulence
characteristics, but also on the performances and operating
range of the turbocharger compressor