内可逆Ericsson循环最大生态学有效功率性能

Maximum ecological efficient power performance of endoreversible Ericsson cycle

应用有限时间热力学分析方法,在已有文献建立的内可逆Ericsson循环模型基础上,以生态学有效功率为目标函数,研究循环的性能特性。通过数值计算,分析参数K/lnr_(p)(K是与回热时间系数有关的变量,rp是压力比)和传热系数对生态学有效功率与效率、温比和功率特性关系的影响,并对比循环在最大生态学有效功率、最大功率、最大有效功率和最大生态学函数条件下的性能差异。结果表明:生态学有效功率与温比和效率呈类抛物线型,生态学有效功率与功率呈扭叶型,循环的最大生态学有效功率及其对应的最优温比和功率随K/lnr_(p)增大或传热系数的降低而减小;以生态学有效功率为优化目标时牺牲部分输出功率,提高了效率,降低了熵产率,为实际热机性能优化设计提供一种新的方案。

Using the finite-time thermodynamics analysis method,based on the endoreversible Ericsson cycle model established in existing literature,the ecological efficient power is taken as the objective function to study the performance characteristics of the cycle.Through numerical calculations,the impact of the parameter K/lnr_(p)(K is a variable related to the reheat time coefficient,rp is the pressure ratio)and the heat transfer coefficient on the relationship between ecological efficient power and efficiency,temperature ratio,and power characteristics is analyzed.The performance differences of the cycle under the conditions of maximum ecological efficient power,maximum power,maximum effective power,and maximum ecological function are compared.The results show that the ecological efficient power is parabolic with temperature ratio and efficiency,and loop-shaped with power.The maximum ecological efficient power of the cycle and its corresponding optimal temperature ratio and power decrease with the increase of K/lnr_(p) or the reduction of the heat transfer coefficient.When optimizing for ecological efficient power,some output power is sacrificed,which improves efficiency and reduces the rate of entropy production,providing a new scheme for the performance optimization design of actual heat engines.