... is idealized as a solid body rotation and defined as the acoustic frame of reference. Although the swirl-factor is indeed a function of the radial position (see Fig. 3 ), this simplification in many cases leads to good agreements between predicted and experimentally determined acoustic resonances...

...Bernd Hellmich; Joerg R. Seume Nonharmonic acoustic resonance was detected in the static pressure and sound signals in a four-stage high-speed axial compressor when the compressor was operating close to the surge limit. Based on prior research reported in the literature and measurements...

...A. J. Cooper; A. B. Parry; N. Peake A theoretical model is used to investigate the effect of geometry, flow conditions and acoustic lining on the occurrence of acoustic resonance within aeroengine ducts. Semi-analytical methods are used to demonstrate that two types of acoustic resonance can...