These activities generally fall into one of the three categories: noise source modifications (e.g. retrofitting engine nacelles with sound absorption material), land use regulations (e.g. zoning land near an airport as nonresidential), and operational controls (e.g. power cutbacks during operations; this is considered impractical because the pilot workloads and flight safety decrease).
An optimal shape design of the mail-slot nacelle surface with the adjoint method was successfully conducted to reduce the strength of shock waves and flow separations on the cowl surface.
The Akira class featured the traditional saucer section and nacelles combined with a catamaran-style double hull; the Norway class was based on the USS Voyager; the Saber class was a smaller ship with nacelles trailing off the tips of its saucer section; and the Steamrunner class featured twin nacelles trailing off the saucer and connected by an engineering section in the rear.
In Pensacola, Fla., G.E. workers assemble the hub, or nose cone, of the machine, along with the nacelle, which attaches to the hub and houses the turbine's operating "brains".
The calculated velocity field in the vicinity of the nacelle exhibits good agreement with available experimental data.
Results obtained for radiation from an axisymmetric nacelle alone are compared with those obtained when the same nacelle is installed in a generic configuration, with and without a wing.
The lidar measures the component of wind speed along its beam direction but, since it rotates with the nacelle to point into the wind, this component normally differs negligibly from the actual wind speed.
Especially for wind power the potential rises with increasing technological know-how, as more and more surface areas can be used for wind power production, the installed capacity per m rises with rising size of the plants, and full-load hours rise as well with increasing nacelle height (e.g. Haas et al., 2007).
The engine nacelles were redesigned with smaller cross-sections with less drag.
Afterwards, the downstream wake field of the turbine is investigated with two different nacelle shapes.
