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Title: Acoustic matching of a traveling-wave thermoacoustic electric generator
Authors: Wang, Kai
Zhang, Jie
Zhang, Ning
Sun, Daming
Luo, Kai
Zou, Jiang
Qiu, Limin
Keywords: Thermoacoustic
Linear alternator
Issue Date: 2016
Source: Wang, K., Zhang, J., Zhang, N., Sun, D., Luo, K., Zou, J., et al. (2016). Acoustic matching of a traveling-wave thermoacoustic electric generator. Applied Thermal Engineering, 102, 272-282.
Series/Report no.: Applied Thermal Engineering
Abstract: Acoustic impedance matching is critical to the overall performances of a traveling-wave thermoacoustic electric generator. This paper presents an effective approach for matching the acoustic impedances of the thermoacoustic engine and the linear alternators for maximizing the output electric power and thermal-to-electric efficiency. The acoustic impedance characteristics of the engine and the linear alternators are analyzed separately, and the methods for modulating the acoustic impedances are investigated numerically. Specially, two different coupling locations including one at the resonator and the other one at the loop of the thermoacoustic engine are compared. It is found that the imaginary part of the load acoustic impedance should be near zero for a good output performance of the engine at either coupling location. The real part of the optimal acoustic impedance for the coupling location at the resonator is smaller than that for the one at the loop. The acoustic impedance of the linear alternator can be simply and effectively adjusted to the expected range by tuning the operating frequency, load resistance and the electric capacitance. Both the experiments and numerical simulations show that a better matched condition can be achieved when they are coupled at the location at the resonator. Maximum output electric power of 750.4 W and the highest thermal-to-electric efficiency of 0.163 have been achieved. When they are coupled at the loop, the maximum electric power and the thermal-to-electric efficiency become 506.4 W and 0.146 due to the lower quality of the acoustic matching. The acoustic matching approach presented in the paper would be helpful for guiding the designs of thermoacoustic/alternator and compressor/cryocooler systems.
ISSN: 1359-4311
DOI: 10.1016/j.applthermaleng.2016.03.106
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2016 Elsevier Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Applied Thermal Engineering, Elsevier Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles

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