Physical Mechanisms of Thermoacoustic Taconis Oscillations
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概要
- 論文の詳細を見る
This paper clarifies quantitatively physical mechanisms of thermoacoustic Taconis oscillations in a helium-filled, quarter-wavelength tube by performing numerical simulations based on the one-dimensional nonlinear theory in the boundary-layer approximation developed in a previous paper. Thermoviscous effects appear in the form of memory integrals and affect the acoustic main-flow region through the radial velocity at the edge of the boundary layer. Solving an initial- and boundary-value problem for a smooth temperature distribution on the tube wall, it is revealed that the boundary layer in the cold part is active to pump energy into the main-flow region and the initial instability of the gas is brought about by a subtle unbalance in the axial distribution of net power input by the boundary layer. Also checked is the validity of Rayleigh's criterion based on the heat flux into the gas through the tube wall. It is also revealed that Rayleigh's criterion is similar to the present one based on the power input but it fails to pinpoint the instability.
- Physical Society of Japanの論文
- 2009-09-15
著者
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Sugimoto Nobumasa
Department Of Mechanical Engineering Faculty Of Engineering Science Osaka University
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Shimizu Dai
Department of Mechanical Engineering, Graduate School of Engineering, University of Osaka, Suita, Osaka 565-0871
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Sugimoto Nobumasa
Department of Mechanical Science, Graduate School of Engineering Science, University of Osaka, Toyonaka, Osaka 560-8531
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