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Many engineering devices, such as jet engines, helicopters, cooling fans, and wind turbines, generate sound as a result of the flow of air....


= Encyclopedia Article; = Research Update
Figure 1.Sound waves produced by (a) monopole, (b) dipole, and (c) quadrupole sources in an otherwise stationary uniform medium. Shading is proportional to the wave magnitude. Adjacent lobes of the dipole and quadrupole are noticeably out of phase.
From update 'Aeroacoustics'
Figure 2.Generation of leading-edge noise. Blade is traveling from right to left.
From update 'Aeroacoustics'
Figure 3.Combination of acoustic disturbances from a moving helicopter blade.
From update 'Aeroacoustics'
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