摘要
用有限时间热力学理论,以功率密度(循环输出功率与最大比容之比)为优化目标,分析了存在传热损失时内可逆空气标准矩形循环的性能特性,导出了循环功率密度与循环膨胀比和效率的关系,通过数值计算给出了传热损失以及循环中各参数对功率密度特性的影响。所得结果表明,功率密度与循环膨胀比的关系曲线为类抛物线型,功率密度与循环效率的关系曲线是扭叶型,热机在最大功率密度时的效率虽然小于最大功率时的效率,但最大功率密度下的热机尺寸参数更小。
Using finite-time thermodynamic theory,the performance characteristics of an endoreversible air standard rectangular cycle are analyzed by taking the power density(the ratio of cycle power output to maximum specific volume)as the objective function,and the relationships between the power density and expansion ratio,as well as between the power density and efficiency are derived.The effects of heat transfer loss and the cycle parameters on the power density characteristics are given by numerical calculations.The results show that the relation curves of the cycle power density and expansion ratio are parabolic-like,those of the power density and efficiency are loop-shaped,and the engine efficiency at the maximum power density is smaller than those of at the maximum power,while the size parameter at the maximum power density is smaller than that of at the maximum power.
出处
《节能》
2020年第9期65-69,共5页
Energy Conservation
基金
国家自然科学基金资助项目(项目编号:51779262)。
关键词
有限时间热力学
矩形循环
内可逆循环
功率密度
热效率
性能分析
finite-time thermodynamics
rectangular cycle
endoreversible cycle
power density
thermal efficiency
performance analysis
