论文标题
流体流的工作萃取：Carnot效率的类似物
Work-extraction from fluid flow: the analogue of Carnot's efficiency
论文作者
论文摘要
为了探索风力涡轮机的物理极限，我们开发了一个模型，以确定可从可压缩流体流中提取的工作。该模型采用质量，能量和熵的保护，并导致通用界限，以从动能中提取的工作效率。到达结合，以达到足够缓慢的，弱的准二维无耗散流量。在几个方面，绑定与热引擎效率的Carnot极限相似。更普遍地，我们表明，最大的工作提取需要焓的贡献，并且可以达到声音输出速度和强大的强迫。
Aiming to explore physical limits of wind turbines, we develop a model for determining the work extractable from a compressible fluid flow. The model employs conservation of mass, energy and entropy and leads to a universal bound for the efficiency of the work extractable from kinetic energy. The bound is reached for a sufficiently slow, weakly-forced quasi-one-dimensional, dissipationless flow. In several respects the bound is similar to the Carnot limit for the efficiency of heat-engines. More generally, we show that the maximum work-extraction demands a contribution from the enthalpy, and is reached for sonic output velocities and strong forcing.
