等温加热修正双布雷顿循环分析与优化  

Exergy Analysis and Optimization for Binary Brayton Cycle with Two Isothermal Heat Additions

作　　者：齐伟[1,2,3] 王文华[1,2,3] 陈林根[1,2,3] QI Wei WANG Wenhua CHEN Lingen(Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan 430033, China Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan 430033, China College of Power Engineering, Naval University of Engineering, Wuhan 430033, China)

机构地区：[1]海军工程大学热科学与动力工程研究室,武汉430033 [2]海军工程大学舰船动力工程军队重点实验室,武汉430033 [3]海军工程大学动力工程学院,武汉430033

出　　处：《热力透平》2017年第2期76-81,共6页Thermal Turbine

基　　金：国家自然科学基金(51576207)

摘　　要：采用热力学第二定律分析法研究等温加热修正的双布雷顿循环性能,导出了循环比功和效率解析式。通过数值计算,讨论了循环中换热器有效度等参数对系统效率的影响,发现存在顶循环和底循环最佳压比使得系统效率和输出比功最大,上下两循环等温加热过程能显著提高循环效率,顶循环中的燃烧和等温燃烧过程导致的损失最大。The binary Brayton cycle with two isothermal heat additions was analyzed using second law thermodynamics. The analytical formulae for specific work and exergy efficiency of the cycle were then derived. The effects of various parameters including effectiveness of heat exchanger in the cycle on the exergy efficiency were addressed by detailed numerical examples. It is found that there exist optimum pressure ratios of the topping and bottoming cycles, resulting in the maximum exergy efficiency and specific work, and the exergy efficiency increases greatly as the two isothermal heat addition processes are involved in the topping and bottoming cycles. Also, it is found out that the major exergy loss are caused by conventional combustion and isothermal combustion.

关 键 词：等温加热 双布雷顿循环 [火用]效率 [火用]损失 

分 类 号：TK472[动力工程及工程热物理—动力机械及工程]