Research On Performance Of ?-type Stirling Engine Regenerator

Although fossil energy is still the main body of energy use at present,it has faced a huge crisis.In recent years,the development and utilization of solar energy is fast and violent.Dish Stirling solar thermal power generation technology has become a potential application in the development and utilization of renewable energy.Stirling engine is the core part of dish power generation.This paper focuses on the internal heat storage part of Stirling engine.The Stirling engine regenerator is studied theoretically and experimentally.Firstly,the structure of wire mesh regenerator for?Stirling engine is studied in this paper.The various factors affecting the performance of the regenerator are analyzed,and the regenerative degree is calculated by the two-parameter coupling method to obtain the coupled three-dimensional map.Analysis of the losses of the regenerator.Calculate the flow pressure drop of the working fluid through the regenerator and compare the effects of each two-parameter combination on the flow pressure drop.The parameter optimization selection range is obtained:x?1,?=0.6⁰.75,D?0.06 m.In the parameters affecting the regenerative heat and flow pressure drop,the independent parameters are selected as the independent variables,and the regenerative heat and flow pressure drop are the dependent variables respectively.The horizontal orthogonal table of L₁₆?5⁴?factor is selected to study the significance of the influence of parameters on regenerative heat degree and flow pressure drop by means of one-way variance analysis,and multiple comparative analysis is carried out.The conclusion that the porosity has the greatest influence on the heat recovery and flow pressure drop.Secondly,in order to analyze the working process of the oscillating flow of the Stirling engine regenerator,the optimal parameter combination is selected according to the theoretical calculation results,and the three-dimensional model of the Stirling engine wire mesh type regenerator is established and simulated.UDF is used to compile the boundary conditions of the pulsation velocity inlet and the pressure outlet,simulate the high temperature working fluid flowing through the regenerator,store the heat in the heat storage process of the wire mesh,and the low temperature working fluid flows through the regenerator into the wire mesh.The heat takes away the heat release process.The effects of different frequencies,inlet speeds,working fluid types,and hot end temperatures on the heat transfer of the regenerator are investigated.The temperature variation cloud diagram is used to analyze the change of the internal temperature of the regenerator,the dimensionless parameter Re and Nu,fitting correlation of the unsteady heat transfer are studied,and the flow pressure drop in the regenerator is analyzed and calculated.Finally,according to the optimized parameter scheme,the regenerator is designed and processed,and the experimental platform of the wire mesh type regenerator experimental test system is built.The experimental system consists of three parts.The experimental working fluid is air,and the temperature of different pipeline heaters?110?,140?,170??and system flow rate?70 m³/h,90 m³/h,110 m³/h?are set.The temperature measurement point arranged at the inlet and outlet of the regenerator wire mesh records the temperature change every second,and the pressure gauge records the pressure change of the inlet and outlet of the regenerator.The heat storage and heat release performance of the dish Stirling regenerator under different working conditions were studied experimentally.The temperature change curve is analyzed to obtain the variation law of the temperature difference between the inlet and outlet of the regenerator screen under different temperature conditions.The variation law of the average temperature of the inlet and outlet of the regenerator under different flow rates is analyzed.The flow pressure drop generated by air flowing through the regenerator under different temperature and flow conditions is studied.It is concluded that the higher the temperature,the greater the temperature difference between the inlet and outlet of the regenerator,and the flow pressure drop increases with the increase of temperature and flow.The performance of?-Stirling engine regenerator is optimized by theoretical calculation and numerical simulation.It provides a theoretical basis for further research on the regenerator of plate Stirling solar thermal power system.It has certain guiding significance for the application of regenerators on engineering.