Experimental Study of an Evaporative Combustion-Driven Ultra-high Frequency Thermoacoustic Stirling Electric Generator
Portable power generator with several hundred watts capacity plays an important role in off-grid applications and emergency scenarios.Free piston Stirling electric generator is quite promising due to their outstanding advantages of high efficiency,high reliability,low noise and multi-source adaptability.This paper presents a novel diesel evaporative combustion-driven free piston Stirling generator for the first time.Based on the design optimization of impedance match and combustion-alternating flow thermal coupling,an experimental setup was fabricated and tested.Output characteristics under different combustion power was systematically investigated and the system losses were analyzed.Preliminary experimental results of a maximum output electric power of 320 W at a heating temperature of about 600℃ and a maximum thermal-to-electric heating efficiency of 11.28％in terms of input diesel fuel calorific value were obtained.Benefiting from the ultra-high operating frequency of 130 Hz,the generator has a specific power of 90 W/kg.
diesel evaporative combustionultra-high frequencyfree-piston stirling electric gen-eratoroutput characteristics
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