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首页> 外文期刊>Energy Conversion & Management >Optimization of a regenerative Brayton cycle by maximization of a newly defined second law efficiency
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Optimization of a regenerative Brayton cycle by maximization of a newly defined second law efficiency

机译：通过最大化新定义的第二定律效率来优化再生布雷顿循环

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The idea is to find out whether 2nd law efficiency optimization may be a suitable trade-off between maximum work output and maximum 1st law efficiency designs for a regenerative gas turbine engine operating on the basis of an open Brayton cycle. The primary emphasis is placed on analyzing the ideal cycle to determine the upper limit of the engine. Explicit relationships are established for work and entropy production of the ideal cycle. To examine whether a Brayton cycle may operate at the regime of fully reversible characterized by zero entropy generation condition, the cycle net work is computed. It is shown that an ideal Brayton-type engine with or without a regenerator cannot operate at fully reversible limit. Subsequently, the analysis is expanded to an irreversible cycle and the relevant relationships are obtained for net work, thermal efficiency, total entropy production, and second law efficiency defined as the thermal efficiency of the irreversible cycle divided by the thermal efficiency of the ideal cycle. The effects of the compressor and turbine efficiencies, regenerator effectiveness, pressure drop in the cycle and the ratio of maximum-to-minimum cycle temperature on optimum pressure ratios obtained by maximization of 1st and 2nd law efficiencies and work output are examined. The results indicate that for the regenerator effectiveness greater than 0.82, the 2nd law efficiency optimization may be considered as a trade-off between the maximum work output and the maximum 1st law efficiency.
机译：这个想法是要找出第二定律效率优化是否可能是基于开放式布雷顿循环运行的可再生燃气涡轮发动机的最大功输出和最大第一定律效率设计之间的适当折衷。主要重点在于分析理想循环以确定发动机的上限。建立理想循环的显式关系用于功和熵的产生。为了检查布雷顿循环是否可以在以零熵产生条件为特征的完全可逆的状态下运行，计算了循环网络。结果表明，带有或不带有再生器的理想布雷顿型发动机不能在完全可逆的极限下运行。随后，将分析扩展到一个不可逆循环，并获得有关净功，热效率，总熵产生和第二定律效率的相关关系，其定义为不可逆循环的热效率除以理想循环的热效率。研究了压缩机和涡轮效率，再生器效率，循环中的压降以及最大与最小循环温度之比对通过最大化第一和第二律效率和功输出获得的最佳压力比的影响。结果表明，对于再生器效率大于0.82的情况，第二定律效率优化可被视为最大功输出与最大第一定律效率之间的权衡。

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