Two of these engines, which turn fan blades to produce thrust, are mounted in each of four large pods, called nacelles, at the front and back of the fuselage.
Other orientations are possible, such as the "80 Jump" takeoff which uses nacelles at 80° to quickly achieve high altitude and speed.
Using 11-month, 15-min averaged measurements by nacelle anemometers at 274 wind turbines, we studied the spatial and temporal variability of wind speed in a wind farm over an area of about 20 km by 20 km located in mountainous terrain.
The first mass (Mass1) representing the weight of the complete nacelle was applied at 12 nodes at the top of the tower, so that each node had a mass of 1826 N s2/m.
Both studies employed simple single-degree-of-freedom models with the rotor and nacelle mass lumped at the top of the tower.
The above-mentioned WTs employ a variable-speed doubly-fed induction generator (DFIG) and an individual step-up transformer with output voltage of 33 kV at nacelle or pad-mount, according to the structure stamina of WTs.
Two-dimensional axisymmetric and three-dimensional steady turbulent flow computations around two horizontal-axis wind turbines (Nordex N80 and Jeumont J48) are carried out to investigate the wind-rotor/nacelle interaction and quantify its effects on the wind speed at the nacelle anemometry.
Gamesa's nacelle assembly plant is at Red Hills, 35 km from Chennai.
Comparisons are drawn against nacelle unsteady pressure transducer measurements at two axial locations as well as against near- and far-field microphone array measurements outside the duct.
After discussions with the town, the wind developers agreed to send the tall nacelles, which sit at the top of the turbine towers and contain the electrical generating components, through town at night, so few people would be delayed.
