境界層理論に基づくタコニス振動の数値的研究(波動(2),一般講演)

概要

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Emergence of Taconis oscillations in a helium-filled, quarter-wavelength tube is examined in detail numerically by solving an initial- and boundary-value problem to nonlinear equations derived previously on the basis of the boundary-layer theory. It is found that the instability is controlled by the mean value of the acoustic energy flux due to the boundary layer over the side wall of the tube. It is also found that Rayleigh's criterion for instability based on the heat flux into the tube is qualitatively valid but it fails to pinpoint the emergence of instability. The acoustic field is clarified quantitatively for steady state of marginal case. It is revealed that the variations of density, temperature and entropy are much greater than the pressure and axial velocity.
日本流体力学会の論文
2008-09-04