Ozone Transport in 311 MVA Hydrogenerator: Computational Fluid Dynamics Modelling of Three-Dimensional Electric Machine

Rodrigo M. S. de Oliveira (), Gustavo G. Girotto, Licinius D. S. de Alcantara, Nathan M. Lopes and Victor Dmitriev
Additional contact information
Rodrigo M. S. de Oliveira: Instituto de Tecnologia (ITEC), Federal University of Pará (UFPA), Rua Augusto Correa n∘ 01, Belém 66075-110, Brazil
Gustavo G. Girotto: Instituto de Tecnologia (ITEC), Federal University of Pará (UFPA), Rua Augusto Correa n∘ 01, Belém 66075-110, Brazil
Licinius D. S. de Alcantara: Instituto Ciberespacial (ICIBE), Federal Rural University of Amazon (UFRA), Avenida Presidente Tancredo Neves, n° 2501, Belém 66077-830, Brazil
Nathan M. Lopes: Instituto de Tecnologia (ITEC), Federal University of Pará (UFPA), Rua Augusto Correa n∘ 01, Belém 66075-110, Brazil
Victor Dmitriev: Instituto de Tecnologia (ITEC), Federal University of Pará (UFPA), Rua Augusto Correa n∘ 01, Belém 66075-110, Brazil

Energies, 2023, vol. 16, issue 24, 1-35

Abstract: In this paper, a three-dimensional turbulent fluid dynamics numerical model of a 311 MVA full hydroelectric power plant unit is made, using the finite element method, to study and understand the ozone transport mechanisms inside the enclosured electric machine structure. In the real world, ozone is produced by partial discharges related to faults on stator bars. In order to analyse ozone transport from localised sources, a 3D fluid dynamic model of a complete hydrogenerator in operation is developed and presented for the first time. The model has a high level of geometric detail. Furthermore, a new proposal to simplify the modelling of radiators is implemented and validated. The modelled structure is based on a Campos Novos hydrogenerator electric machine and it consists of 378 coil-type stator bars made of copper covered by mica and, more externally, by a semiconductor coating layer. Other parts are also represented, including the stator core and air directors made of stainless steel, copper radiators, the rotor with its epoxy surface, and the concrete floor and concrete external walls. In the fluid dynamics model, a finite element mesh was designed to represent the air regions inside the hydrogenerator and the material surfaces that react with ozone (with their respective reaction rates), where the airflow and ozone transport are modelled using the Navier–Stokes equations and the mass conservation law. Partial discharge sources are represented by ozone sources with prismatic shapes, placed on surfaces of stator bars. Ozone concentrations have been calculated inside and around the generator machine. The rotor radius is 3.8075 m and its rotation frequency is 200 RPM. Radial air velocity due to interpole ventilation is also considered (2.2 m/s, as experimentally verified in loco. The radial velocity in the vicinity of the radiators is 3 m/s. It has been concluded that the ozone transport profile is influenced by the source positioning on the stator bars in such a way that source pinpointing is possible and it depends on determining the local and global maxima areas of ozone concentration at the radiators.

Keywords: partial discharges; ozone transport; hydrogenerator; computational fluid dynamics; finite element method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/24/8072/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/24/8072/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:16:y:2023:i:24:p:8072-:d:1300525

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().