直线电机驱动回热器性能研究

Study on the Regenerator Driven by Linear Alternator

本文提出并搭建了一种采用直线电机驱动的回热器热声转换实验台,通过调节负载阻抗改变回热器处声场条件,研究回热器在不同声场下热声转换特性。文中首先对实验系统进行了数值模拟,结果表明,回热器存在最优的工作声场,但由于有限水力半径因素,最优声场会偏离行波相位。计算中系统获得了最大1300 W净输出声功,热声效率达到35%。之后进行的实验实现了回热器处声场的调节,验证了回热器的声功放大作用,并获得了与数值计算相同的趋势。

An experiment rig is proposed and built to study on the performance of regenerator driven by linear alternator. With the change of load impedance, different acoustic field is derived and thermoacoustic conversion of the regenerator in different acoustic field can be investigated. Firstly, numerically work is done and the results show that an optimal acoustic field exists for the performance of regenerator and because of finite hydraulic radius, the optimal acoustic field will deviate the traveling-wave phasing. The maximum net output acoustic power of 1300 W is obtained with a thermoacoustic emciency of 35%. Then preliminary experiments are done which realizes the regulation of acoustic field and verifies the acoustic power amplification in the regenerator. The experimental results have the same trend with the calculation.