用于热声发电的曲柄连杆式换能器工作特性

Operating characteristics of crank-rod transducer used in thermoacoustic power generation

针对热声发电系统的曲柄连杆式换能器建立数学物理模型,研究不同活塞质量、转动惯量、压力振幅及负载电阻对换能器工作特性的影响规律.结果表明:由于行程固定,曲柄连杆式换能器阻抗幅值由压力振幅、频率、活塞行程及面积确定,相位角由负载电阻与输入压力振幅共同决定.当输入振幅0.2 MPa、频率65 Hz的压力波,负载电阻为110Ω时,换能器的阻抗实部为1.244×107 Pa·s/m3,虚部为-1.209×107 Pa·s/m3,可输出电功为680.1 W,声电效率约为82.2%.

A mathematical-physical model of crank-rod transducer（CRT）used in thermoacoustic power generation system（TAGS）was developed.The effects of design parameters（such as piston weight,rotational inertia,pressure amplitude and electrical load）on the working performance of the CRT were analyzed.Due to its fixed stroke,the impedance amplitude of CRT is determined by the pressure amplitude,frequency,stoke and area of piston,while the phase angle is decided both by driving pressure amplitude and electrical resistance.When the driving pressure has an amplitude of 0.2MPa,frequency of 65 Hz,with an electrical load of 110Ω,the real part of CRT impedance is 1.244×107 Pa·s/m3,the imaginary part is-1.209×107 Pa·s/m3,outputting 680.1 W electrical power with an acoustic-electrical efficiency of 82.2%.