Abstract
We build a thermoacoustic engine unit composed of a coaxial tube and a regenerator, and measure the acoustic field when the gas column is forced to oscillate at the frequency of 50 Hz. It is found that the engine unit is capable of producing acoustic power when a sufficiently high temperature difference is created along the regenerator. A compact thermoacoustic Stirling engine would be built if the coaxial tube is used instead of a looped tube.
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