工质线性变比热内可逆矩形循环功率密度和有效功率特性  

Power density and effective power characteristics of an endoreversible rectangular cycle with linear variable specific heat of working fluid

作　　者：巩启锐 戈延林 陈林根 施双双 冯辉君 GONG Qi-rui;GE Yan-lin;CHEN Lin-gen;SHI Shuang-shuang;FENG Hui-jun

机构地区：[1]武汉工程大学热科学与动力工程研究所,湖北武汉430205 [2]湖北省绿色化工装备工程技术研究中心,湖北武汉430205 [3]武汉工程大学机电工程学院,湖北武汉430205

出　　处：《节能》2022年第1期33-38,共6页Energy Conservation

基　　金：国家自然科学基金(项目编号:51779262);武汉工程大学研究生教育创新基金资助项目(项目编号:CX2020038,CX2020044)。

摘　　要：应用有限时间热力学理论基于已有文献建立的模型,以功率密度和有效功率为优化目标,分析工质比热随温度线性变化条件下,存在传热损失的内可逆矩形循环性能特性,得到循环无因次功率密度P_(d)、无因次有效功率W_(ep)与循环膨胀比γ和效率η之间的关系。结果表明,循环P_(d)-γ和W_(ep)-γ关系曲线均为类抛物线型,P_(d)-η和W_(ep)-η关系曲线均为扭叶型;热机在最大功率密度工作点的效率小于在最大功率工作点的效率,在最大功率密度工作点的热机能够拥有更小的尺寸参数;热机在最大有效功率工作点的效率大于在最大功率工作点的效率。Based on the established model in the previous literature, finite-time thermodynamics theory is applied to analyze the performance characteristics of an endoreversible rectangular cycle with heat transfer and linear variable specific heats of working fluid with its temperature by taking the power density and effective power as the objective functions in this paper. The relationships among the dimensionless power density P_(d), dimensionless effective power W_(ep)versus cycle expansion ratio γ and efficiency η are derived. The results show that the relationship curves of P_(d)-γ and W_(ep)-γ are all parabolic-like, while the relationship curves of P_(d)-η and W_(ep)-η are loop-shaped. Although the efficiency of the heat engine under the maximum power density operation point is less than that under the maximum power output operation point, the heat engine under the maximum power density operation point can acquire a smaller size parameter.The efficiency of the heat engine under the maximum effective power operation point is larger than that under the maximum power output operation point.

关 键 词：有限时间热力学 工质变比热 内可逆矩形循环 功率密度 有效功率 性能优化 

分 类 号：O414[理学—理论物理]