吸込風洞を用いた気流発生音の計測に関する研究(J13-1 空力音I,J13 流体関連の騒音と振動)

概要

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In this study, in order to examine the noise measurement technique of the internal flow, the flow noise due to vortex shedding from a circular cylinder was measured by use of a suction type wind tunnel which was equipped with glass wool walls and a condenser microphone. As a result of experiments, it was confirmed that the operation noise of the blower was sufficiently cut off. In case of the glass wool wall, the uniformity of flow distribution was good but the thickness of the boundary layer became thick. The directivity of both of the source and the microphone did not influence a measurement result in the experiment range. It was proved that the microphone was measuring a fluid noise by the fluid vibration which was based on the Karman vortex shedding. It was obtained that this measurement technique was suitable for the fluid noise measurement of the internal flow.
一般社団法人日本機械学会の論文
2004-09-04