Abstract
A coaxial-type thermoacoustic system (coaxial type) has the potential to solve the problem of the practical use of downsizing while keeping high efficiency. However, when a prime mover (PM) is set close to the antinode of the sound pressure distribution, the performance of the coaxial type is degraded due to the shift of the resonance mode. In the present paper, resonance control is experimentally investigated to improve the performance of the coaxial type. On the basis of sound pressure distributions, the setting position to suppress the excitation of the secondary mode is predicted and resonance mode control with an additional PM is attempted. As a result, resonance control is successfully attained and the sound pressure is enhanced compared with the system with a single PM. The oscillation temperature is also lowered by more than 200 °C, and an improvement of performance is confirmed.
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