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.
作者
齐伟
王文华
陈林根
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)
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)
