In order to clarify the principle of oscillation in a two-phase fluid thermoacoustic engine, energy generation in a moisturized stack is theoretically investigated. Theoretical equations to express the energy generation are derived first using Raspet’s theory. The validity of derived equations was suggested by comparing the calculated value and the measured value. Furthermore, on the basis of derived equations, the distribution of the energy generation in a moisturized stack and the ratio of the energy generations in air and water are derived with the measurement results for temperature distribution in the stack. As a result, it is confirmed that the energy generation based on the phase transition of water is significant near the hot end of the stack and occupies around 60% of the total energy generation in a two-phase fluid thermoacoustic engine. It is also suggested that the optimum length of stack may exist.

为了阐明两相流体热声发动机中的振荡原理，从理论上研究了湿电池组中的能量产生。首先使用Raspet理论推导表达能量产生的理论方程。通过比较计算值和测量值，表明推导方程的有效性。此外，基于导出的方程式，利用对电池组中的温度分布的测量结果，得出在潮湿的电池组中的能量产生的分布以及在空气和水中的能量产生的比率。结果，证实了基于水的相变的能量产生在烟囱的热端附近是显着的，并且在两相流体热声发动机中占据了总能量产生的约60％。