As suggested by much smaller microscopic Carnot efficiency of a transversely oscillating gas-parcel in a thermoacoustic engine than macroscopic Carnot efficiency of the whole stack, the Lagrangian microscopic energy efficiency of a gas parcel is different from the macroscopic energy efficiency of the whole stack. The relationship of the former to the latter is theoretically discussed. Furthermore, it is numerically shown that the microscopic energy efficiency in a wet stack is considerably lower than that in a dry stack due to both heat loss by latent heat of water evaporation and more heat influx associated with evaporation.

中文翻译：

---

热声发动机中气体包裹的拉格朗日微观能效与宏观能效的关系

正如热声引擎中横向振荡气体小包的微观卡诺效率比整个烟囱的宏观卡诺效率小得多所暗示的那样，气体小包的拉格朗日微观能效不同于整个烟囱的宏观能效。理论上讨论了前者与后者的关系。此外，从数值上显示，由于水蒸发潜热的热量损失和与蒸发有关的更多热量流入，湿式烟囱中的微观能量效率大大低于干式烟囱中的能量效率。