Published online by Cambridge University Press: 04 April 2024
Chapter 5 focuses on free shear layers and jets that involve the merging of two flow streams. Away from a boundary, the mean flow that results is inviscidly unstable and rapidly leads to the formation of coherent vortical structures that drive strong fluid mixing. In jets, it can result in large acoustic levels. Free shear layers are also highly sensitive to sound excitation that can lead to resonant growth of the instability, or a means of control. With this understanding, both passive and active methods of free shear layer control are presented.
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