Transfiguration of Air Jet in <I>Ab Initio</I> Sounding Process of Organ Pipes

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  • 121 オルガンパイプの発音過程における空気ジェットの変貌
  • オルガン パイプ ノ ハツオン カテイ ニ オケル クウキ ジェット ノ ヘン

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Abstract

Our present knowledge of the sounding mechanism in flue organ pipes seems to be well founded and fully evolved through a long history of the research originated by Helmholtz and Rayleigh. However, if we define the sound excitation as the initial change from a nonsonic to a sonic fluid motion, there is no ab initio theory of the sounding mechanism based on such a definition. From this viewpoint a smoked jet in organ pipes is observed by a digital high-speed video camera when the blowing pressure varies from null to a final steady value. The jet displays complicated transfigurations until it reaches to the periodic orderly back-and-forth deflection. During this process some acoustic spectral components are organized in harmonic relation via mode locking in nonlinear systems. Also, the phase speed and amplification factor of the spatially growing wave on the jet are estimated from the visualized shape in the steady-state oscillation.

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