3818 円柱から放射される空力音に対する乱流の影響(J15-1 流体関連の騒音と振動(1)-円柱と渦-,J15 流体関連の騒音と振動,2005年度年次大会)

概要

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In this paper we attempted to develop a low-noise "active turbulence generator (ATG)" for aerodynamic noise measurement in a large scale turbulent flow field. The aerodynamic noise from the developed ATG was only 10 dB larger than that of the conventional wind tunnel. Aerodynamic noise from a circular cylinder was measured to estimate sound generation effect on turbulence intensity. Karman vortex was observed at both of the laminar and turbulent flow. The Aeolian tone from the cylinder placed at turbulent flow was the almost same as that of laminar flow. It is well known that intermittent holes on the cylinder surface can be reduced the Aeolian tone form a cylinder. However, the noise reduction level decreased when the incoming flow was turbulence. The turbulent intensity of incoming flow is important parameter of the aerodynamic noise generation. The active turbulence generator is therefore one of the useful devices to estimate effect of turbulence on aerodynamic noise generation.
社団法人日本機械学会の論文
2005-09-18