广义传热规律下的斯特林热机的Z函数优化

Z-function optimization of Stirling heat engine under generalized heat transfer law

基于广义传热规律Q∝(ΔT)m,建立不可逆斯特林热机模型,并考虑热阻、热漏和回热损失对热机的影响.以Z函数为目标实现功率与效率之间的协调优化,对比研究Z函数与效率、功率与效率,功率与效率的关系曲线,讨论漏热率、回热器效率、回热时间等参数对斯特林热机性能的影响.结果表明:漏热率越小,回热时间越短;回热器效率越大,斯特林机性能越好.

Based on the generalized heat transfer law Q∝(ΔT)^m,an irreversible Stirling heat engine model was established and the effects of thermal resistance,heat leakage and heat recovery losses on the heat engine were considered.The Z-function is used as the goal to achieve the coordination and optimization between power and exergy efficiency.The relationship between the Z-function and exergy efficiency,power and exergy efficiency,power and efficiency is studied and compared.The influence of parameters such as heat-recovery rate,regenerator efficiency and reheating time on the performance of Stirling heat engine is discussed.In addition,the smaller the heat loss rate,the shorter the regenerative time,and the greater the efficiency of the regenerator,the better the performance of the Stirling machine.