一般論文[学術論文]
数値計算を用いた熱音響機関とリニア発電機の高効率接続手法
キーワード:
thermoacoustic generator,
linear alternator,
acoustic connection,
acoustic impedance,
waste heat
2023 年 31 巻 4 号 p. 531-541
詳細
2023 年 31 巻 4 号 p. 531-541
In this study, numerical calculations were performed to find for a combination of parameter values that maximizes the efficiency of a thermoacoustic generator within the variable range of the parameters that can be varied in the device while acoustically connecting a thermoacoustic engine (TAE) and a linear alternator (LA). In the numerical calculations, the thermoacoustic generator was separated into its constituent elements, TAE and the LA. The acoustic impedance Z and the efficiency were calculated individually for each separated component while varying the parameters on which the acoustic impedance Z depends for each. From the individually calculated Z, combinations of parameters (frequency f, the hot end temperature of the regenerator TH of the TAE, the coordinates of the branch pipe x of the TAE, the external resistance R2 of the LA, and the capacitance C of the LA) were obtained that allow the acoustic connection between the TAE and the LA. Furthermore, the efficiency of the whole thermoacoustic generator was obtained by multiplying of the efficiency of the TAE by that of the LA for the combination of parameters satisfying the above mentioned conditions. As a result, the maximum efficiency of the thermoacoustic generator of 0.358 was obtained under the following condition: TH = 800K, x = 11.026 m, f = 47 Hz, R2 = 7.95 Ω, C = 405 μF.
