Abstract
The species of working gas greatly influences the performance of Stirling engine. The superiority of hydrogen and helium with light molecular weight has been confirmed experimentally. In thermoacoustic engine which resembles Stirling engine, the mixed gas is the optimum for the working gas, and the mixed gas of helium and argon is used. In this study, the effect of mixing ratio of helium and argon on the Stirling engine performance is examined experimentally in order to examine the possibility of the application of mixed gas to Stirling engine. As the result, though the indicated power increases with the increase of mixing ratio of argon to helium, the buffer loss also increses and the brake power decreases.
