Abstract
The purpose of this research is to clarify the generation condition of aeroacoustic resonance noise radiated from a cascade of flat blades. Resonance frequencies and the sound pressure levels were measured in a low noise wind tunnel. The results showed the strong tonal noise generated when the shed frequency of wake vortex was equal to the acoustic resonance frequency of the flat-plate. Moreover, an empirical model for the estimation of the open-end correction of the resonance frequency was suggested. Also, we clarified the effects of the offset length between the blades on the range of velocity for the occurrence of the 2nd peak of aeroacoustic resonance noise and the sound pressure level of the 2nd peak.
