内可逆闭式Braysson循环生态学有效功率特性  

Ecological Efficient Power Performance for an Endoreversible Closed Braysson Cycle with Constant-temperature Heat Reservoirs

作　　者：巫云雷 戈延林 刘鹏[1,2,3] 陈林根[1,2,3] 齐丛正 刘旭 WU Yun-lei;GE Yan-lin;LIU Peng(Institute of Thermal Science and Power Engineering,Wuhan Institute of Technology;School of Mechanical&Electrical Engineering,Wuhan Institute of Technology;Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment)

机构地区：[1]武汉工程大学热科学与动力工程研究所 [2]武汉工程大学机电工程学院 [3]湖北省绿色化工装备工程技术研究中心

出　　处：《电站系统工程》2024年第3期15-18,共4页Power System Engineering

基　　金：国家自然科学基金(52171317,51779262);武汉工程大学研究生教育创新基金项目(CX2022081)资助。

摘　　要：基于有限时间热力学理论和前人建立的恒温热源闭式Braysson循环模型,以生态学有效功率E_(η)为目标,研究了循环性能特性,推导出了E_(η)的表达式。通过数值分析的方法,分析了工质热容率C_(wf)、工质对数温比x和热导率分配u对E_(η)性能的影响,比较了循环工作在最大无因次生态学有效功率E_(η,max)、最大无因次功率P_(max)、最大无因次生态学函数E_(max)和最大无因次有效功率E_(P,max)条件下的性能差异。研究结果表明:在给定C_(wf)的情况下,存在最佳的工质对数温比(x_(opt))和热导率分配(u_(opt))使循环的E_(η)达到最大值;在分别给定x和u的情况下,E_(η)随着C_(wf)的增大而减小;当设计目标从其他目标转为E_(η)时,可以通过牺牲部分功率换取效率的提升。Based on the finite-time thermodynamic theory and endoreversible closed Braysson cycle model with constant temperature heat reservoirs established in previous literature,this paper studies the cycle performance characteristics with ecological efficient power(E_(η))as the objective function.The expression of E_(η)is derived.Through numerical analysis method,the effects of heat capacity(C_(wf))of working fluid,logarithmic temperature ratio(x)of working fluid and thermal conductivity distribution(u)on E_(η)are analyzed.The performance differences are compared when cycle works under the maximum dimensionless ecological efficient power E_(η),the maximum dimensionless power P_(max),the maximum dimensionless ecological function E_(max) and the maximum efficient power E_(P,max) conditions.The results show that there are the optimal logarithmic temperature ratio(x_(opt))of working fluid and optimal thermal conductivity distribution(u_(opt))to maximize the cycle E_(η) with the given C_(wf).With the given x and u,E_(η) decreases with the increase of C_(wf).When the design objective is changed from other objectives to E_(η),the efficiency can be improved with the sacrifice of part power.

关 键 词：有限时间热力学 内可逆闭式Braysson循环 生态学有效功率 主要性能 性能比较 

分 类 号：TK17[动力工程及工程热物理—热能工程]