Abstract
For the downsizing, the coaxial thermoacoustic system (coaxial-type) has been proposed. The coaxial-type is expected to have high efficiency because the energy conversion with traveling wave phase like looped-tube is realized. Additionally, this system is more compact than the looped-tube. The circular flow path of the coaxial-type is made of an annular flow path between the inner and the outer tube and a cylindric flow path in the inner tube. By propagating in the cylindric flow path after passing through the annular flow path, a traveling-wave sound field is generated. The edge space between the annular flow path and the inner tube was studied due to the reduction of the propagation loss. The influence of the inner tube length and the edge shapes of outer tube on the energy conversion was examined. The two edge shapes were used: the flat one and the spherical one. It was confirmed the sound energy generated in the system with the spherical shape is higher than the one with the flat shape. It is suggested a traveling-wave sound field is easily generated by the spherical shape because of the focus effect. Thus, the edge shape is one of important points for designing the coaxial-type.
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