枝管付きループ管における音の熱音響増幅効果

抄録

We demonstrated selective amplification of acoustic power by utilizing thermoacoustic effects.

As acoustic amplification device, a straight resonator tube connected with looped tube was investigated. In experiments, measurements of frequency characteristics, sound pressure, particle velocity, and acoustic intensity were carried out. It was found that when the node of velocity amplitude in the straight tube was connected with the inlet of looped tube, the sound intensity was amplified more efficiently. Summarizing these results, the performance of proposed selective amplification was discussed in relation the resonance tube geometry.