| Mechanical and Energy Engineering |
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| Impedance matching of traveling-wave thermoacoustic electric generating system |
| ZHANG Jie, SUN Da-ming, WANG Kai, LUO Kai, ZHANG Ning, ZOU Jiang |
| Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China |
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Abstract The output characteristics of a thermoacoustic engine and the input characteristics of linear alternators were calculated based on the decoupling method and theoretical analysis. Moreover, the performance of the traveling-wave thermoacoustic electric generator was studied theoretically and experimentally. Simulation results show that the engine output power and thermal-to-acoustic efficiency are high when the real part of output impedance is in the range of 1.0×107 to 2.0×107 Pa·s/m3, and the imaginary part is under magnitude order of 106 Pa·s/m3; the high-efficiency operating frequency is 65.5 Hz. The performance of the linear alternator is remarkably influenced by working frequency, load resistance, etc. The best working frequency for the alternator is 72 Hz and the optimal range of load resistance is 80 to 200 Ω. The electric generating system can attain 520 W in power and 24.4% in thermal-to-electric efficiency theoretically when the mean pressure is 3.16 MPa and the heating temperature is 550 ℃ in simulation. The experiment gives a maximum power of 481 W and a highest thermal-to-electric efficiency of 15.1%. The theoretical and experimental results are in coincidence basically, which proves the correctness of the physical model and the good impedance matching of the thermoacoustic electric generating system.
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Published: 01 March 2017
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Cite this article:
ZHANG Jie, SUN Da-ming, WANG Kai, LUO Kai, ZHANG Ning, ZOU Jiang. Impedance matching of traveling-wave thermoacoustic electric generating system. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(3): 494-499.
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行波热声发电系统的阻抗匹配
通过系统解耦的方法和理论分析,计算行波热声发动机输出特性和直线发电机的输入特性,同时开展行波热声发电机性能的理论和实验研究.模拟发现,当发动机声功输出处阻抗实部为1.0×107 ～2.0×107 Pa·s/m3、阻抗虚部在106 Pa·s/m3量级内时,发动机输出声功率及热声效率高,发动机高效工作的频率约为65.5 Hz；直线电机性能受工作频率、外接负载等因素的影响,最佳工作频率约为72 Hz,最优外接负载为80～200 Ω；在3.16 MPa的充气压力和550 ℃的加热温度下,该发电系统的理论发电功率达到了520 W以上,最高热电效率达到了24.4%；实验中,最高电功率达到了481 W,最高热电效率达到了15.1%.数值模拟结果与实验结果基本吻合,验证了物理模型的正确性,说明该热声发电系统实现了良好的阻抗匹配.
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