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搭建一个实验测试平台,对回热器热声转换特性进行实验研究。实验系统由分别充当压缩机和发电机的多台直线电机及被测的回热器、换热器、热缓冲管等组成。实验对不同加热温度与声场条件下回热器的热声转换特性进行系统的研究。在平均压力为4 MPa时,实验获得的最大净输出声功为688 W,最大热声效率为34.2%。实验结果表明,在同等条件下,回热器加热温度越高,其输出声功越大,同时热声转换效率越高;回热器工作存在最优的声场条件,使其净输出声功与热声效率分别达到最大。
An experimental test platform is set up to study the thermoacoustic conversion characteristics of regenerator. The experimental system consists of multiple linear motors acting as compressors and generators respectively, as well as the regenerators, heat exchangers and thermal buffers tested. Experiments were conducted to study the thermoacoustic conversion characteristics of the regenerator under different heating temperature and sound field conditions. When the average pressure is 4 MPa, the maximum net output sound power is 688 W and the maximum thermoacoustic efficiency is 34.2%. The experimental results show that under the same conditions, the higher the heating temperature of the regenerator, the greater the output sound power and the higher the thermoacoustic conversion efficiency. The optimum condition of the regenerator is that the net output sound power and The thermoacoustic efficiency reaches the maximum respectively.