熱音響現象の直接数値解析(波動・音・衝撃波(3),一般講演)

概要

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When a temperature gradient give along the axis of a narrow tube exceeds some critical value, the fluid in the tube oscillates spontaneously. In a thermoacoustic engine, these themoacoustic oscillations are used for an energy conversion. In this study the thermoacoustic oscillations are simulated by using a 3D compressible Navier-Stokes equations for a simple model and the flow field in the tube are investigated. The result shows that the energy conversion from heat to acoustic intensity takes place the center region of the tube where the steep temperature gradient is imposed. And we find that the acoustic intensity to the radial direction is not negligible for the energy conversion, although the velocity to the radial direction is too small in comparison with the axial velocity.
日本流体力学会の論文
2007-08-06