Ventilation system with skewed rotor cooling ducts of 40-MW synchronous machine: a case study

Franc, J.; Pechánek, Roman; Kindl, Vladimir; Zavrel, Martin

doi:10.1007/s00202-019-00767-z

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…The governing equations are solved with a standard k-ε model for turbulence modeling. Simultaneously, the energy equation is also solved to determine the heat transfer in both solid and fluid regions [40,41]. The basic 3D model of the cooling duct including PEM and cooling fins is depicted in several view sections in Figure 11.…”

Section: Fc Cfd Heat Transfer Simulation and Cooling Duct Optimizationmentioning

confidence: 99%

Heat Transfer Optimization of NEXA Ballard Low-Temperature PEMFC

Chesalkin¹,

Kacor

Moldrik

2021

Energies

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Hydrogen is one of the modern energy carriers, but its storage and practical use of the newest hydrogen technologies in real operation conditions still is a task of future investigations. This work describes the experimental hydrogen hybrid energy system (HHS). HHS is part of a laboratory off-grid system that stores electricity gained from photovoltaic panels (PVs). This system includes hydrogen production and storage units and NEXA Ballard low-temperature proton-exchange membrane fuel cell (PEMFC). Fuel cell (FC) loses a significant part of heat during converting chemical energy into electricity. The main purpose of the study was to explore the heat distribution phenomena across the FC NEXA Ballard stack during load with the next heat transfer optimization. The operation of the FC with insufficient cooling can lead to its overheating or even cell destruction. The cause of this undesirable state is studied with the help of infrared thermography and computational fluid dynamics (CFD) modeling with heat transfer simulation across the stack. The distribution of heat in the stack under various loads was studied, and local points of overheating were determined. Based on the obtained data of the cooling air streamlines and velocity profiles, few ways of the heat distribution optimization along the stack were proposed. This optimization was achieved by changing the original shape of the FC cooling duct. The stable condition of the FC stack at constant load was determined.

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Section: Fc Cfd Heat Transfer Simulation and Cooling Duct Optimizationmentioning

confidence: 99%

Heat Transfer Optimization of NEXA Ballard Low-Temperature PEMFC

Chesalkin¹,

Kacor

Moldrik

2021

Energies

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“…The profile of the sub-slot at the bottom of the rotor slot is often tapered smoothly from the inlet of the sub-slot to the axial center, which helps to enhance the pressure of the hydrogen gas cooling the axially middle part of the rotor, improving the cooling effect of the rotor [14]. Regarding the ventilation duct inside the rotor winding, when using radial straight-type ventilation ducts, changing the inclination angle of the radial ventilation duct can improve the vortex phenomenon inside the ventilation duct but does not affect the temperature distribution of the rotor [15]. To further reduce the temperature rise of the rotor, a solution of adopting a composited radialaxial-radial cooling structure inside the rotor field winding has been proposed.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Coupled Fluid–Thermal Field of a Large Nuclear Turbine Generator with Radial and Composited Radial–Axial–Radial Ventilation Systems

Zhang,

Wang,

Zhang

et al. 2024

Machines

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With the continuous growth of energy demand, the advantages of nuclear power, such as high energy density, low emissions, and cleanliness, are gradually highlighted. However, the increasing capacity of the turbine generator in nuclear power plants has led to greater losses and critical heating issues. Designing an effective cooling system plays an important role in improving the rotor’s heat dissipation ability, especially under the condition of limited rotor space. In this study, the cooling effects of the rotor using a radial straight-type cooling structure and a composited radial–axial–radial cooling structure are compared and analyzed for a 1555 MVA hydrogen-cooled nuclear turbine generator. Three-dimensional fluid thermal coupled models of the rotor with both cooling structures are established, and corresponding boundary conditions are provided. The models are solved using the finite volume method. The flow law of cooling hydrogen gas inside the rotor and the temperature distribution of various parts of the rotor are studied in detail. Compared with the radial straight-type cooling structure, adopting the composited radial–axial–radial cooling structure can reduce the average temperature of the rotor field windings by 4.5 °C. The research results provide a reference for the design and optimization of the rotor cooling system for large-capacity nuclear turbine generators.

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“…J. Franc proposed ventilation system with skewed rotor cooling ducts of 40 MW synchronous turbo-generator, studied and compared the thermal behavior for three different arrangements of the rotor ventilation ducts, and pointed out the ways to improve the cooling system of the turbo-generator [6]. G. Zhou analyzed advantages and disadvantages of various ventilation systems for air-cooled turbo-generator, designed and optimized a multi-chamber forward-flow cooling path for a large air-cooled turbogenerator [7].…”

Section: Introductionmentioning

confidence: 99%

Influence of a Novel Stator Teeth Internal Ventilation Structure on Air-Cooled Turbo-Generator Parameters and Stator Temperature

Liu

Luo

et al. 2020

IEEE Access

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In order to solve the problems of severe heating and cooling difficulty in the stator of air-cooled turbo-generator, a novel stator teeth internal ventilation structure with axial vents in the generator stator teeth is proposed. Based on this structure, global two-dimensional electromagnetic field models of 150MW aircooled turbo-generator with different stator teeth internal ventilation structures are established to study the influence of the axial vents of the internal ventilation structure on air gap magnetic flux density of the generator, magnetic flux density of stator teeth, stator core loss, and synchronous reactance. Furtherly, flow network models of the ventilation system with the different internal ventilation structures and fluid-heat transfer numerical models of stator with half axial and one tooth pitch of generator are established to calculate the effects of the structure on the temperature of stator winding, insulation and teeth. It can provide a new research idea for the ventilation structure of large air-cooled generator. INDEX TERMS Air-cooled turbo-generator, ventilation structure, electromagnetic field, temperature field

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Ventilation system with skewed rotor cooling ducts of 40-MW synchronous machine: a case study

Cited by 8 publications

References 29 publications

Heat Transfer Optimization of NEXA Ballard Low-Temperature PEMFC

Heat Transfer Optimization of NEXA Ballard Low-Temperature PEMFC

A Comparative Study on Coupled Fluid–Thermal Field of a Large Nuclear Turbine Generator with Radial and Composited Radial–Axial–Radial Ventilation Systems

Influence of a Novel Stator Teeth Internal Ventilation Structure on Air-Cooled Turbo-Generator Parameters and Stator Temperature

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