A small‐scale, thermoacoustic‐Stirling electric generator for deep‐space applications

Although thermoacoustic‐Stirling hybrid engines (TASHE) have not been previously coupled to transducers to produce useful electric power, they have demonstrated high thermal‐to‐acoustic power conversion efficiencies. Electric generation is investigated by coupling a small TASHE to an electrodynamic linear alternator with an emphasis on satisfying NASA’s need for a small, lightweight, efficient electric generator for deep‐space missions. The combined goals of low mass and high efficiency require the TASHE to have the largest acoustic power output possible from a minimum enclosed volume, which imposes a relation between various impedances of the TASHE’s lumped‐element loop. The design of the TASHE and alternator used in this generator will be reviewed, performance data presented, and possible improvements discussed. [Work supported by NASA.]