Experimental Study of a Miniature High Specific Power Thermoacoustic Stirling Generator
A highly efficient,portable power supply capable of delivering several hundred watts is in high demand for applications such as outdoor sports and emergency relief efforts.The external combustion thermoacoustic Stirling generator is a key technology for developing such power sys-tems due to its fuel flexibility,high efficiency,compactness,reliability,and quiet operation.This paper presents a novel approach using a spiral tube hot-end heat exchanger to enhance combustion-alternating flow heat transfer performance and specific power.A 300-watt-class thermoacoustic Stirling power generation system is designed and constructed,leveraging impedance matching and combustion-heat transfer coupling.The system's output characteristics are experimentally examined under varying operating conditions,and a comprehensive loss analysis is conducted.Preliminary ex-perimental results show that the power generation system achieves a maximum output electrical power of 415 W at a flue gas temperature of 765℃,with a corresponding thermoelectric efficiency of 13.9％based on the diesel calorific value.With an ultra-high operating frequency of 135 Hz and lightweight design,the generator body achieves a specific power of 112 W/kg,demonstrating significant application potential.
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