To provide a thermoacoustic engine and an α-type Stirling engine with minimized change in a flow passage sectional area.
A flow passage of working fluid is formed by a plurality of narrow tubes 8 to extend from a heater connection section 6 in which a heater 3 is connected to an acoustic cylinder 2 to a cooler connection section 7 in which an opposite acoustic cylinder 2 is connected to a cooler 4. The plurality of narrow tubes 8 are arranged leaving a space between the narrow tubes in a part between the heater 3 and the cooler 4 via a regenerator 5, and the space between the plurality of narrow tubes 8 is gradually reduced toward the acoustic cylinders 2 respectively in the heater connection section 6 and in the cooler connection section 7 to closely arrange the plurality of narrow tubes 8 toward the acoustic cylinders 2, and the difference between the flow passage sectional area in the acoustic cylinders 2 and the total flow passage sectional area by the plurality of narrow tubes 8 is a predetermined value or less.
HASEGAWA SHINYA
ABE MAKOTO
