Abstract
In this work, we simultaneously measured the pressure and velocity oscillations in a U-tube of a water Stirling engine. We found that the energy conversion from heat flux to work flux is executed through the Stirling cycles and that the acoustic impedance responsible for the energy conversion is considerably higher than other thermoacoustic engines. We conclude a water Stirling engine can be a powerful device for applications such as a prime mover and a cooler having no mechanical parts.
