熱音響システムの周波数応答計測における定常発振制御を用いた発振周波数の決定

抄録

Thermoacoustic systems utilizing the thermoacoustic phenomena are one of means for recovering waste heat from factories and automobiles. In the practical application of thermoacoustic systems, it is important to estimate the steadystate pressure amplitude for thermoacoustic self-excited oscillation at the system design stage. In this paper, we propose a frequency response measurement method with large amplitude excitation using the resonance characteristics of the measurement tube by steady-state oscillation control. The oscillation frequency is determined automatically by the resonance frequency which depends of the tube length without using a sinusoidal reference signal. It is shown that the frequency response obtained by the proposed method agrees well with the one obtained using a sinusoidal reference signal. Furthermore, the pressure amplitude for thermoacoustic self-excited oscillation of thermoacoustic engine was estimated with in about 10% error.