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提出了声学放大器的概念,有意识地用一根长管来连接热声发动机与脉冲管制冷机.理论计算表明,合适的管长及管径可以大幅度地放大来自热声发动机的压力波动,脉冲管制冷机从而可以获得更大的驱动压比.在理论分析的基础上,初步的研究也证实了压力波动的放大效果.在平均压力2.46MPa,工作频率69Hz时,一根内径8mm,长2.8m的紫铜管把来自热声发动机的压力波动幅值平均放大为2.5倍以上.特别地,使用1.67kW的加热功率,发动机的压比为1.11,脉冲管制冷机入口的压比到达了1.32,进而在脉冲管制冷机的冷头获得了65.7K的温度.
The concept of acoustic amplifier was proposed and a long tube was used to connect the thermoacoustic engine and the pulse tube refrigerator.The theoretical calculation shows that the suitable tube length and diameter can greatly amplify the pressure fluctuation from the thermoacoustic engine, In the theoretical analysis, based on the preliminary study also confirmed the magnification effect of pressure fluctuations in the average pressure 2.46MPa, the operating frequency of 69Hz, an inner diameter of 8mm, length 2.8 m of the copper tube to amplify the pressure fluctuation amplitude from the thermoacoustic engine by an average of 2.5 times or more.In particular, with a heating power of 1.67 kW, the engine pressure ratio was 1.11 and the pressure ratio at the entrance of the pulse tube refrigerator reached 1.32 , And then in the pulse tube refrigerator cold head obtained 65.7K temperature.