Abstract
A standing wave thermoacoustic engine is composed of a stack introduced inside a tube. The tube used for general thermoacoustic engines has high aspect ratio which is the ratio of its length to its diameter. When the length of a thermoacoustic engine is set to 10 mm with keeping the same aspect ratio, the diameter of the engine becomes excessively small and little output power can be delivered from it. Therefore, it is necessary to reduce the aspect ratio in order to develop a miniature thermoacoustic engine. In this paper, we investigate the onset temperature ratio T_h/T_c of a thermoacoustic engine with the low aspect ratio.
