科研之友
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摘要
The climate of the Algerian Sahara is characterized by extreme thermal conditions. The wind turbines installed in the Sahara, namely the electromechanical equipment located inside the nacelle (e.g. electrical generator), are subjected to high and fluctuating temperature gradients during the day and the seasons. This reality might generate contradictory constraints of design and can lead to some difficulties of conception. In order to maintain an appropriate temperature of the air inside the nacelle (i.e. acceptable average temperature of the electromechanical equipment), the heat generated by the generator must be rejected towards the environment, and the resulting heat transfer must be controlled properly. This work deals with heat transfer effects within a reduced scale nacelle, i.e. hypothetical nacelle. For this purpose, a small nacelle dimensions have been considered and represented as rectangular cavity. In this paper, the air flow fields within the nacelle have been described using the Navier-Stokes equations. The energy equation has been used to account for heat transfer effects. ANSYS FLUENT code has been employed to solve the resulting governing equations. The main object of this work is to determine the average temperature inside the nacelle, as well as to investigate its variation with the required cooling capacity.
- 出版日期2017
