Numerical Study of Flow and Heat Transfer Around a Rotor

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Gerami, Mohammad | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 48135 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Nouri Borujerdi, Ali
Abstract:
The purpose of this study is to investigate the distribution of air flow and temperature in electric machines. The fluid flow equations are solved by using the characteristic Galerkin. The unsteady equations of the air flow and heat transfer between the rotor, stator and radial cooling channels of the generator are solved by finite element method. Tetrahedral elements are used, but hexahedral elements can also be used. The upwind method is used to discretize the convection terms, but the central difference for the diffusion parts, that is equal to Petrov-Galerkin method in steady state situation. Due to the large number of channels and specific geometry, to reduce the computation costs, the lumped parameters method is used by some assumptions. The results show that the pressure drop across the 200 MW generator air gap with 2 meters length and 12 cm hydraulic diameter, is about 1.2 kPa, and the air temperature has increased about 80 K. Also there is an optimized depth of the stator body slots (slots for installation of coils) due to heat transfer, which is calculated by trial and error
Keywords:
Incompressible Flow ; Finite Element Method ; Lumped Parameter Method ; Air Cooling ; Electrical Machines ; Characteristics Method ; Petrov-Galerkin Approach

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