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portada Methodology for the Numerical Characterization of a Radial Turbine Under Steady and Pulsating Flow
Type
Physical Book
Publisher
Author
Language
English
Pages
248
Format
Paperback
ISBN13
9783656507239

Methodology for the Numerical Characterization of a Radial Turbine Under Steady and Pulsating Flow

Pablo Fajardo (Author) · Grin Verlag · Paperback

Methodology for the Numerical Characterization of a Radial Turbine Under Steady and Pulsating Flow - Pablo Fajardo

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Synopsis "Methodology for the Numerical Characterization of a Radial Turbine Under Steady and Pulsating Flow"

Doctoral Thesis / Dissertation from the year 2012 in the subject Engineering - Mechanical Engineering, Universidad Politécnica de Valencia (Departamento de M aquinas y Motores T ermicos), 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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