摘要
基于已有文献建立的存在传热、摩擦和内不可逆性损失的不可逆Atkinson循环模型,利用有限时间热力学理论,以循环功率密度(循环输出功率与最大比容之比)为目标函数,对工质比热随温度线性变化条件下的循环进行了性能分析。由数值计算给出了循环功率密度与压缩比和效率的特性关系,分析了工质变比热特性、传热、摩擦和内不可逆性损失对Atkinson循环功率密度特性的影响。结果表明:循环功率密度与压缩比的关系曲线呈抛物线型,功率密度与效率的关系曲线呈扭叶型。与最大功率条件相比,Atkinson循环发动机在最大功率密度条件下具有更小的尺寸参数和更高的效率。
Based on the irreversible Atkinson cycle model with heat transfer, friction and internal irreversibility losses established in previous literature and using finite-time thermodynamic theory, this paper analyzes the performance characteristics of the cycle by taking power density(the ratio of cycle power output to maximum specific volume) as the objective function when the specific heats of the working fluid change linearly with the its temperature. The relationships between the power density and compression ratio, as well as between the power density and efficiency are given by numerical calculations. The effects of variable specific heat characteristics of working fluid, heat transfer, friction and internal irreversibility losses on the power density characteristics of the Atkinson cycle are analyzed. The results show that the relation curves of the cycle power density and compression ratio are parabolic, those of power density and efficiency are loop-shaped, and the Atkinson cycle engine has smaller size parameters and higher efficiency at the maximum power density than those at the maximum power.
作者
施双双
陈林根
戈延林
吴志祥
SHI Shuang-shuang;CHEN Lin-gen;GE Yan-lin
出处
《节能》
2020年第6期114-119,共6页
Energy Conservation
基金
国家自然科学基金(项目编号:51779262)。
关键词
有限时间热力学
Atkinson循环
功率密度
工质变比热
性能比较
finite-time thermodynamics
Atkinson cycle
power density
variable specific heats of working fluid
performance comparison
