D-233 音響孤立波の再検証実験

概要

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This paper verifies existence of the acoustic solitary waves in an air-filled tube with an array of Helmholtz resonators connected. Following up the previous Letter (Sugimoto et al. 1999), the experiments are improved by using a plane piston driver to generate initial pressure pulse and also by extending the tube length from 7.4m to 10.6m. Direct and indirect checks are made to confirm the existence. The former compares the profiles and propagation speeds of the pulses measured experimentally with the theory. The latter examines validity of the nonlinear wave equations, suggesting the solitary waves in lossless limit, by solving an initial-value problem numerically to simulate real evolution observed in the tube. From the comparison of the simulation with the experiment, it is found that the equations can describe the real evolution very well. Thus it can be concluded that the acoustic solitary waves exist in reality when all lossy effects are suppressed below negligible level.
日本流体力学会の論文
2003-07-28