Abstract
Because of the importance of the thermoacoustic prime mover for all sorts of applications, we have investigated its performance at different operating conditions. Of special interest is the onset of oscillation temperature difference and its dependence on the geometry of the device. This was investigated in miniature heat engines, with resonant frequencies of 2 – 5 kHz, with temperature differences where one end of the device was below room temperature and also when the other end was above room temperature. All the devices were operated with air at 1 atm in the wave resonator configuration. The onset temperature ratios depended strongly on geometry, stack, heat exchangers, and on the degree of traveling wave admixture to the standing wave produced by the resonator.
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