The Fifth International Exergy, Energy and Environmental Symposium, IEEES-5 Luxor, Egypt,, 2011
The present paper introduces a turbocharger system that operates in dual modes. In the first mode... more The present paper introduces a turbocharger system that operates in dual modes. In the first mode, the turbocharger is power assisted at lower engine rotational speeds. Thereafter, the second mode is switched leading the compressor and the turbine to rotate separately for best performance. Sequential analysis is presented to introduce simply procedure for turbocharger dimensioning and bade profile assignment. This procedure begins from turbocharger system as whole unit then its turbine and finally ends with its centrifugal compressor. The analytical procedure based on simple measured data as well as assignment of percentage of the assisted power in the first operating mode. For assigning compressor and turbine blade profiles, some basic assumptions are proposed that should be further verified by system parameter identifications. According to different analysis, demonstrative operational charts of turbocharger, its turbine and its compressor for two operating modes are presented.
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Papers by Nazih Bayomi
consideration from the scientists in comparison with the circular
cylinders, although they are widely used in many engineering applications
such as buildings and electronic components. Therefore
the main object of this work is to study experimentally and numerically
the flow around the square cylinder. An experimental test rig
was implemented to measure the pressure distribution on cylinder
surfaces for different angles of incident flow. Three Reynolds
numbers of 13.5, 9.5 and 6.8×104 were considered for these cases.
The drag and side forces were estimated for different angles of
attack. The flow was visualized for the different conditions considered.
The experimental data were verified by numerical data that
were provided for the same used conditions by ANSYS 5.4 commercial
code. The code was modified to simulate the considered
cases; it is reliable enough to provide different flow patterns by
computational fluid dynamics (CFD) tools. Compressible turbulent
flow was taken into consideration to solve the two-dimensional
Navier-Stokes equations with a turbulent model. The numerical
simulation as a cheap tool allowed presenting full flow visualization
and variables distribution in the considered test domain. A close
agreement between the experimental and numerical results was
obtained.
consideration from the scientists in comparison with the circular
cylinders, although they are widely used in many engineering applications
such as buildings and electronic components. Therefore
the main object of this work is to study experimentally and numerically
the flow around the square cylinder. An experimental test rig
was implemented to measure the pressure distribution on cylinder
surfaces for different angles of incident flow. Three Reynolds
numbers of 13.5, 9.5 and 6.8×104 were considered for these cases.
The drag and side forces were estimated for different angles of
attack. The flow was visualized for the different conditions considered.
The experimental data were verified by numerical data that
were provided for the same used conditions by ANSYS 5.4 commercial
code. The code was modified to simulate the considered
cases; it is reliable enough to provide different flow patterns by
computational fluid dynamics (CFD) tools. Compressible turbulent
flow was taken into consideration to solve the two-dimensional
Navier-Stokes equations with a turbulent model. The numerical
simulation as a cheap tool allowed presenting full flow visualization
and variables distribution in the considered test domain. A close
agreement between the experimental and numerical results was
obtained.