Research On Regenerator Characteristics And System Performance Of Stirling Engine Based On Finite Time Thermodynamics

As the energy crisis becomes more and more serious,the development of clean energy and the improvement of energy efficiency have become the focus of all sectors of society.Under such a circumstance,the Stirling engine has been paid new attention by its good heat source adaptability,high energy efficiency and reliable stability.Stirling engine uses Stirling cycle,the highest thermal efficiency of the Stirling cycle is the same as the Carnot efficiency,and it can output more work.The key component to achieve all this is the regenerator.The regenerator is the core component of the Stirling engine and the focus of scholars’ research.In the actual process,the losses occurring inside the regenerator can be mainly divided into irreversible heat losses and irreversible hydraulic resistance losses.In this paper,a new regenerator theoretical model is established by considering the effect of viscous dissipation caused by hydraulic resistance to calculate the irreversible heat losses of the heat regeneration process.Through derivation,the calculation formula of regeneration efficiency is obtained,and the irreversible regeneration heat loss in the regeneration process is analyzed.Then,considering the changing of the properties of the working fluid during the heat regeneration process,a theoretical model closer to the actual working conditions was established.The values of temperature,pressure and other parameters of the working fluid during the regeneration process were solved by numerical methods,and the influence of varying-properties on the performance of the regenerator was studied.After the regenerator model is established,it is coupled with the existing Stirling engine isothermal model to form a new model considering the hydraulic resistance.By adjusting the model parameters related to hydraulic resistance,the influence of hydraulic resistance on the performance of regenerator was studied.,providing a theoretical support for the optimized design of the Stirling engine.