热声发动机非共振自循环换热环路实验研究

Experimental Study of Non-resonant Self-circulation Heat Transfer Loop for Thermoacoustic Engines

为考察非共振自循环换热环路的实际工作特性,将其与热声发动机相耦合,在不同工况下研究了两种厚度的单向阀片对其内部压力分布、换热特性、声功损耗及压比的影响。为减少该新换热环路的阻力损失和声功耗散,提出了一种新型的水冷换热器以取代其中的传统板式换热器。实验结果表明,当由0.1 mm厚的单向阀片所组成的换热环路内的工作气体平均压力为3.0 MPa、驱动频率为66 Hz时,若输入系统内的热量为1.5 kW,换热量为1.05 kW,其热量传输能力已经超过了传统热声换热器。

The non-resonant self-circulation heat transfer loop is coupled with a thermoacoustic engine to research its real working characteristics.The effects of the check valves of two kinds of thickness on inner pressure distribution,heat transfer characteristics,acoustic power dissipation and pressure rate of this new heat transfer loop are studied under different operating conditions.A new type water-cooled heat exchanger is developed to replace the traditional plate heat exchanger to reduce the resistance loss and acoustic power dissipation in this new heat transfer loop.The experimental results show the amount of heat transfer of the loop with 0.1 mm valve disc thickness is 1.05 kW with 1.5 kW heat input into the system while the mean pressure of the working gas is 3.0 MPa and the driving frequency is 66 Hz and the heat transfer capacity is higher than the traditional heat exchanger.