1992 年 27 巻 1 号 p. 63-69
In order to discuss energy flows in a regenerator, distributions of temperature, energy flows, amplitude of displacement and phase angle are calculated using thermoacoustic theory of inviscid fluid. Although function of the regenerator varies depending on the phase at the cold end, the regenerator behaves as a converter between heat and work flows. Enthalpy flow for the refrigeration mode is a part of energy flow, which remains unconverted, and it corresponds to regenerator loss. Regarding the regenerator as an amplifier of energy flows, the regenerator of work-amplifier mode amplifies work-flow by using heat flowing in at the hot end as an energy source. The amplification coefficient is smaller than a ratio of temperature at the hot end to one at the cold end, TH/Tc. The regenerator of refrigeration mode amplifies heat flow by using work flowing in at the hot end as an energy source. The amplification coefficient is larger than TH/Tc. Regarding the regenerator as a converter of energy flows, it converts work flow to heat flow of the inverse direction for the refrigeration mode, and it converts heat flow to work flow for the work-amplifier mode and the self-sustained oscillation mode. Efficiencies of these conversions are COP of the regenerator for the refrigeration mode and thermodynamic efficiency of the regenerator for the work-amplifier mode and the self-sustained oscillation one.