ループ管型熱音響原動機におけるスタック内温度分布特性

抄録

A loop-tube type thermoacoustic refrigerator consists of a thermoacoustic engine, a thermoacoustic refrigerator and a resonance tube. The engine consists of a ceramic stack with thin tubes and two heat exchangers. The temperature profile inside the stack of a thermoacoustic engine is experimentally investigated. Air is introduced as a working gas. In order to enhance the performance of the thermoacoustic system, it is important to examine the influence of the configuration of each element on the system performance, as well as overall energy conversion efficiency. In this paper, the characteristics of the engine inside are examined for various heater input to the hot side of the stack. Here, the work intensity, that is the power intensity of the generated sound, is theoretically estimated using a two-sensor method from the experimentally obtained phase difference of the sound pressure inside a resonance tube. The characteristics of the temperature profiles inside the ceramic stacks are shown. The temperature gradient on the hot side of the stack is larger than the gradient average estimated from both stack edges. This tendency appears as the temperature difference between both edges increases.