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Description
High cooling power (i.e., from several hundred Watt to thousand Watt) free piston Stirling cryocooler could find important application in fields such as boil-off gas recondensation and superconducting. This work reveals the acoustic field characteristics mainly concerning the regenerator and acoustic impedance match between cooler and linear compressor. Based on thermoacoustic theory, parameter sensitivity and physical mechanisms behind are clearly shown. A further step toward experimental validation is carried out by monitoring some key parameters, including dynamic pressure, acceleration, current, voltage, etc. The good agreement between experiments and calculations is beneficial to a better understanding. So far, a cooling power of 350 W at 80 K has been achieved, corresponding to an acoustic-to-cooling efficiency of 35% of Cannot and the electric-to-acoustic efficiency reaches 82%.