Organized structures in turbulent jets can be modeled as wavepackets. These are
characterized by spatial amplification and decay, both of which are related to stability …

Modelling the noise emitted by turbulent jets is made difficult by their acoustic inefficiency:
only a tiny fraction of the near-field turbulent kinetic energy is propagated to the far field as …

This study investigates an active control strategy to suppress the precessing vortex core
(PVC) and aims to extend the stable operation range of Francis turbine air model. Large …

Rectangular propulsion nozzles offer thrust-vectoring and air-frame-integration advantages
over their more commonly studied circular counterparts. However, they display many …

The use of high-bypass-ratio engines in civil aviation has resulted in the occurrence of an
additional noise source associated with noise of interaction between a jet and an airplane …

Purpose A key component of aircraft acoustic installation effects relevant for under-wing
turbofan-powered airliners, is studied: jet-flap interaction noise. Observations First, noise …

Instability waves traveling within subsonic turbulent jets have a modal linear growth until
approximatively the end of the potential core. At these stations it is believed that nonlinear …

An experimental study of the azimuthal modes of the sound field generated by a single-
stream round jet installed near a flat plate is presented. The investigation is conducted at …

The possibility of controlling instability waves in the mixing layer of a subsonic unexcited jet
is studied. These waves can be noise sources in both free jets and jets as parts of …

Although near-field acoustical holography (NAH) and acoustic intensity analysis have
previously been used to investigate the apparent jet noise sources produced by military …