Numerical Simulation And Experimental Study On The Characteristics Of Regenerator For Stirling Engines

With the situation of the global energy and environmental protection is moresevere,Stirling Engine is being payed more and more attention nowadays because ofits good environmental character and high efficiency. The regenerator is a key part ina Stirling engine,which plays the major role of improving the efficiency and theperformance of Stirling engine, So the research on the regenerator has importantsignificance.On the basis of the existing study, the regenerator in the horizontal opposeddouble pistons Stirling engine as the research object has been determined, the methodnumerical simulation and experiment was applied and the flow and heat transfercharacteristics of the regenerator was investigated, to supply the reference for thetheory research and the design of the regenerator .A numerical investigation of the flow and heat transfer characteristics wasconducted in the model of reciprocating flow in regenerator, Control oftwo-dimensional, unsteady and compressible turbulence flow was analyzed. Clanguage programming technology was used to realize the opposed type doublepistons reciprocating movement, Darcy-Brinkman-Forchheimer porous media flowmodel was adopted in the regenerator, The analysis on the regenerator was made forvelocity field, temperature field and pressure field. The process is close to the actualStirling cycle was obtained, the change of axial velocity gradient in regenerator isuniform,while the temperature has gradient change both in radial and axial directions,maximum resistance but best heat transfer were found in center region.Another numerical investigation of the characteristics was conducted in themodel of unidirectional flow in the regenerator ,different boundary conditions withlast model was set.On the basis of the condition of porosity factor and diameter of thesilk screen,mass flow rate , the properties of axial temperature, heat absorption, heatstorage time and pressure loss was analyzed.The following result was found: Theoverall performance is the best when regenerator is filled with the screen of two kindsporosity. Although the time is longer,better heat and less pressure lose is got when thediameter is larger. The value of the mass flow should be controlled because of it isharmful for the regenerator.A device for testing the regenerator performance was established and theexperiment was taken.The temperature result is fitted between the experiment andsimulation.