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Methodology for the Numerical Characterization of a Radial Turbine under Steady and Pulsating Flow (Paperback)
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Methodology for the Numerical Characterization of a Radial Turbine under Steady and Pulsating Flow (Paperback)
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Doctoral Thesis / Dissertation from the year 2012 in the subject
Engineering - Mechanical Engineering, Universidad Politecnica de
Valencia (Departamento de Maquinas y Motores Termicos), language:
English, abstract: The increasing use of turbochargers is leading
to an outstanding research to understand the internal flow in
turbomachines. In this frame, computational fluid dynamics (CFD) is
one of the tools that can be applied to contribute to the analysis
of the fluid-dynamic processes occurring in a turbine. The
objective of this thesis is the development of a methodology for
performing simulations of radial turbomachinery optimizing the
available computational resources. This methodology is used for the
characterization of a vaned-nozzle turbine under steady and
pulsating flow conditions. An important effort has been devoted in
adjusting the case configuration to maximize the accuracy
achievable with a certain computational cost. Concerning the cell
size, a local mesh independence analysis is proposed as a procedure
to optimize the distribution of cells in the domain, thus allowing
to use a finer mesh in the most suitable places. Particularly
important in turbomachinery simulations is the influence of the
approach for simulating rotor motion. In this thesis two models
have been compared: multiple reference frame and sliding mesh. The
differences obtained using both methods were found to be
significant in off-design regions. Steady flow CFD results have
been validated against global measurements taken on a gas-stand.
The modeling of a turbine, installed either on a turbocharger test
rig or an engine, requires the calculation of the flow in the ducts
composing the system. Those ducts could be simulated assuming a
one-dimensional (1D) approximation, and thus reducing the
computational cost. In this frame of ideas, two CFD boundary
conditions have been developed. The first one allows performing
coupled 1D-3D simulations, communicating the flow variables from
each dom
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