SCOPE OF THE PROJECT
This project is executed for Siemens Gamesa Renewable Energy. The objective is to conduct CFD analysis for the Wind Turbine generator (WTG) unit at the assembly level and to estimate the temperature developed on all the subsystems. We carried out CFD analysis for two configurations, a) The existing configuration consists of four exhaust fans on top of the WTG system and converter refrigerant cooling fan capacity is 1.5 KW. b) The proposed configuration with three exhaust fans at the top of the WTG system and converter refrigerant cooling fan capacity is enhanced to 2.6 KW All the major subsystems in the WTG unit, like transformers, Generator & slip ring system, converter panel, gearbox unit, hydraulic oil tank and converter coolant (refrigerant) systems are considered in the CFD analysis.
The primary subsystems within the wind turbine generator (WTG) unit include three transformers, a generator with a slip ring system, a converter panel, a gearbox unit, a hydraulic oil tank, and a converter coolant system. Each of these subsystems is equipped with its own dedicated fan cooling system. The exhaust fans generate a suction effect within the WTG unit, drawing in ambient air through inlet ducts, which enhances convective heat transfer. In addition to the exhaust fans, every subsystem features an internal fan cooling system, and all fans are incorporated into the computational fluid dynamics (CFD) analysis.
The flow inside the WTG unit is modelled as steady state. Three dimensional Viscous, Incompressible, turbulent Navier-Stokes equations are solved with SIMPLE algorithm on a mesh consisting of 2 million tetrahedral volume cells. Turbulence closure is addressed with K-epsilon turbulence model with standard wall functions (desirable y plus value is > 30 and < 300).Governing equations are discretized with second order upwind scheme.
In this configuration, WTG unit consists of four number of exhaust fans at the top of the nacelle. Converter coolant (refrigerant) fan capacity is 1.5 KW.
In this configuration, WTG unit consists of three number of exhaust fans at the top of the nacelle. Converter coolant (refrigerant) fan capacity is enhanced to 2.6 KW.
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