Experimental Research On The Pressure Drop Characteristics Of Stirling Regenerator Under Oscillating Flow

Free piston Stirling engine（FPSE）has huge potential for solving problem of energyshortage and environmental pollution because of its advantages of wide fuel source, highthermal efficiency, low pollution and low noise etc., So has received widely attention andinterest in Academia. Regenerator and linear motor are both critical components of FPSE,which play the major role of improving the efficiency and performance of the FSPE.Therefore it is necessary to study the characteristics of the regenerator and linear motor.This thesis mainly investigated the flow resistance characteristic of stirling engineregenerator under oscillating flow condition by measuring pressure drop of regeneratorwith experimental method and obtaining velocity with numerical simulation. Firstly, thetransverse flux permanent magnet linear motor (PMLM) of experimental oscillating drivesource is studied. Radial force and electromagnetic force is calculated using3d finiteelement analysis. It is found that the thrust fluctuation of PMLM is mainly caused by thecogging force, while the influence of end effect is weak. Secondly an experiment rig isfounded on designed linear motor to measure pressure drop of regenerator underoscillating flow in the conditions of various work frequency, charge pressure, and phaseangle of the piston. The result shows that there is a phase shift between the two pressuresat the ends of regenerator which was affected by the movement of piston. This resultdemonstrated that the character of oscillating flow is different with single flow.Finally, Soft measurement of flow velocity at the end of regenerator was achievedby CFD numerical simulation on the basis of the experimental parameters.2D model isestablished according to the actual size and structure of the machine. UDF and dynamicgrid technique was adopted to realize oscillation flow boundary condition. Theregenerator was treated as porous media model and its parameters match the test data. Assupplement of the regenerator parametric studies, optimized working parameters ofregenerator is found by REGEN.