The adaptation of annular thermoelectric generator (ATEG) to cylindrical heat sources exhibits a better performance compared to widely studied flat plate type thermoelectric generator (FTEG). To enhance heat transfer and improve the overall performance, a novel structure of the heat exchanger of the twisted-tape annular thermoelectric generator (TT-ATEG) is proposed in this paper. A three-dimensional finite element model of TT-ATEG is established for the first time. The net power gain coefficient and the efficiency gain coefficient are defined to quantify the performance of TT-ATEG, and the gain effects of the length, twist ratio and radius of the twisted tape are analyzed respectively. To maximize the comprehensive performance of TT-ATEG, the optimal weighting factor of net power and efficiency are determined, and the full-parameter optimization of the twisted tape is completed. The results reveal that the optimal performance of TT-ATEG is obtained if the weight ratio of net power and conversion efficiency is 1:4. In our case study, dimensionless factors radius ratio R_r, length ratio L_r and twist ratio of the twisted tape are 0.714, 0.479 and 136.84 respectively. Compared with the ATEG without twisted tape, the net power and efficiency are improved by 10.41% and 22.51%, respectively. The results demonstrate that the novel design of TT-ATEG could accelerate the heat transfer effectively and enhance the overall performance.

与广泛研究的平板型热电发电机 (FTEG) 相比，环形热电发电机 (ATEG) 对圆柱形热源的适应表现出更好的性能。为加强传热，提高整体性能，本文提出了一种新型扭带环形热电发电机（TT-ATEG）换热器结构。首次建立了TT-ATEG的三维有限元模型。定义净功率增益系数和效率增益系数来量化TT-ATEG的性能，分别分析了扭带长度、扭比和半径对增益的影响。为了最大化TT-ATEG的综合性能，确定了净功率和效率的最佳加权因子，完成了扭带的全参数优化。结果表明，当净功率与转换效率的重量比为1:4时，TT-ATEG的性能最佳。在我们的案例研究中，无量纲因子半径比R _r、长度比L _r和加捻带的捻比分别为0.714、0.479和136.84。与无扭带的ATEG相比，净功率和效率分别提高了10.41%和22.51%。结果表明，TT-ATEG的新颖设计可以有效地加速传热并提高整体性能。