2002 大型の風洞吸込口に設けたスリット状膨張空洞の消音効果

概要

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In many cases of fan noise, discrete-frequency noise (DFN), which is usually caused by rotor-stator interaction, is observed. Hence, DFN is realized as one of the main target of fan noise reduction. For such a discrete component of noise, a slit--an expansion chamber with very short axial length in a duct--may be effective as a resonator muffler. Since the slit is easy to be attached to actual machinery for its compactness, some results of its performance on an actual fan have already been obtained by the authors. As one of them, in the case of the wind tunnel in our laboratory, which has a considerably large open end, multiple components of DFN radiated from its inlet were observed. In this report, in order to reduce these components simultaneously, multiple slits--each of them is expected to have a resonant frequency coincides with each DFN--was used as located side by side on the inlet of the wind tunnel. As a result of the measurement of noise, the effectiveness of them was confirmed.
社団法人日本機械学会の論文
2002-09-20