Targeting at addressing the low exergy efficiency of micro thermophotovoltaic (MTPV) system, a novel micro combustor with internal spiral fins is proposed. The geometrical parameters, including internal spiral fin number, length and pitch distance, on the thermal performance and exergy efficiency are numerically investigated. The introduction of internal spiral fins can effectively improve the exergy efficiency and energy output of MTPV system, but with higher pressure loss. The results show that the micro combustor with 8 spiral fins exhibits the highest exergy efficiency of 66.9%, which is 6.9% higher than that of the conventional one at the inlet velocity of 5 m/s. Moreover, the micro combustor with 8 spiral fins obtains the highest energy output is 5.01 W at inlet velocity of 8 m/s. Taking the pressure loss into consideration, the optimal internal spiral fins length of 10 mm is suggested.

针对解决微型热光电系统（MTPV）的低火用效率问题，提出了一种新型的带有内部螺旋鳍片的微型燃烧器。数值研究了包括内部螺旋翅片数量，长度和节距的几何参数对热性能和火用效率的影响。内部螺旋翅片的引入可以有效地提高MTPV系统的火用效率和能量输出，但压力损失更大。结果表明，具有8个螺旋​​形翅片的微型燃烧器的最高火用效率为66.9％，在入口速度为5 m / s时比常规燃烧器高6.9％。此外，具有8个螺旋​​形翅片的微型燃烧器在入口速度为8 m / s时获得的最高能量输出为5.01W。考虑到压力损失