加熱により励起される気柱振動の数値解析 : 第2報,非線形域までの解析と励振機構について

概要

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Phenomena such as singing flame or Rijke tube are types of heat-induced vibrations of an air column in a tube and are also classified as vibrations coupled with fluid motion. In a previous paper the growth process of air column vibration was successfully simulated by solving the equations for the thermoacoustic fields, and the fundamental mechanism of air column vibration in the range of small amplitude was discussed. In this paper the computation is extended to the stage when nonlinear vibrations occur. From the results, it appears that the change of amplitude growth rate of pressure variation is influenced by both the reversed flow pattern around the heater and the energy dissipated by viscosity. The time variations of the energy for excitation and dissipation are evaluated by computation. Calculated results of amplitude growth rate are compared with experimental ones for a vertical tube.
一般社団法人日本機械学会の論文
1995-09-25