热声斯特林发电系统的实验研究

本文介绍了一台由热声斯特林发动机及其驱动的直线发电机组成的热声斯特林发电系统原理样机.一方面为满足发电机与发动机间体积流率和相位的匹配要求,另一方面为了能在直线发电机活塞处获得较好的压力波与体积流率间相位关系、提高直线发电机的电功输出能力,装置保留了发动机原有的锥形谐振管.初步实验以氦气为工质,在2.5MPa平均压力、64Hz工作频率下,获得了97W的电功.本文还分析了该热声发电系统的效率,得出直线发电机声电转换效率超过了0.8.然而由于谐振管耗散了大量的声功,目前整机的热电转换效率还较低.

EXPERIMENTAL INVESTIGATION ON A THERMOACOUSTIC STIRLING ELECTRICAL POWER GENERATION SYSTEM

In this paper,a prototype of a thermoacoustic Stirling electrical power generator(TASEPG) is introduced,which contains a thermoacoustic Stirling heat engine and a linear alternator.In the system setup,a tapered resonance tube is used to meet the coupling requirements on the volume flow rate and phase between the engine and the alternator.Moreover,a better phase angle between pressure and volume flow rate can also be achieved to enhance the performance of the alternator. In the preliminary experiments,97 W electrical power was achieved under 2.5 MPa mean pressure helium and 64 Hz working frequency.Additionally,the acoustic-to-electrical transduction efficiency was obtained above 0.8 by efficiency analysis of the TASEPG.However,due to the great dissipation in the resonance tube,the efficiency of the whole system nowadays is relatively low.