110 平板翼列から放射される空力自励音(空力騒音(1))

概要

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The purpose of this research is to clarify the generation mechanism of aeroacoustics feeddback noise radiated from a flat-plate cascade. The experimental results showed that the resonance frequency of the tonal noise can be determined with the chord length of the flat plate. The open-end correction depends on not only the distance between the blades but also chord length. The empirical equation of the open-end correction was suggested by using the experimental data. The second peak strongly depends on the offset length of the leading edge of the flat plates. The vortex structures were visualized by using the high-speed camera. In the case of resonance mode, the phase differences between the vortices shed from the flat plates were almost constant. The coherence between the vortices and the resonance noise was higher than that of non resonance vortices.
一般社団法人日本機械学会の論文
2010-06-26