Study On The Basic Problems Occurred In The Process Of Thermoacoustic Refrigeration Miniaturization Driven By Magnetostrictive Actuator

Thermoacoustic refrigeration is a new refrigeration technology，It is based on theprinciple of thermoacoustic effect and has the advantages of simple structure, stableoperation, long service life, low noise etc. Especially the miniature thermoacousticrefrigerator has incomparable advantages in microelectronic cooling.This paper describes the research background of miniature thermoacousticrefrigerator and its significance. Describe the domestic and international developmentprocess in detail. The theories which were proposed since the discovery of thermoacousticeffect are summarized. A detailed qualitative analysis on acoustic refrigeration processfrom the view of thermodynamics and about the thermoacoustic effect involved in fluidmechanics, heat transfer and other basic knowledge are described. So we have a completeunderstanding of miniature thermoacoustic refrigerator.In order to verify the feasibility of using software Fluent numerical simulation ofthermoacoustic field. Firstly, simulate sound field of the straight tube, Simulation resultsand theoretical results of wave distribution are convergence. So explain the feasibility ofnumerical simulation with Fluent software. This paper describes the design of a miniaturethermoacoustic refrigerating machine of strengthen type, Using the ways that both frontend of the resonance tube into a conical tube and adjust the tail cavity longitudinaldimensions to reach resonance and increase the amplitude of the resonance tube. Whichimprove the refrigerating efficiency of the refrigerating machine, In order to researchcooling characteristics of a stack, only the resonance tube placed a stack, the stack in thedynamic characteristics of pressure under different cooling conditions were compared bysimulation. Two points as the monitoring points on the left and the right ends of the stack,Displays two point of stack ends refrigeration and temperature specific changes in heatingprocess visually. Form a certain temperature gradient resonant tube, show that the acousticrefrigerating effect at the same time. The integrity of the regenerator and heat exchanger are introduced, The miniaturethermoacoustic refrigerator is analyzed by numerical simulation, the heat exchanger withporous fluid field to numerical simulation analysis. Observe nonlinear phenomena in theregenerator and heat exchanger transitional region. Mainly research on the changes ofdifferent channel stacks temperature, pressure, velocity. Select the channel as a monitoringpoint and observe changes of the temperature, pressure, velocity with time. It also hascarried on the analysis to the axis of a moment in the refrigerator temperature, Through thecomparison of different pressure and frequency on the back to the fluid state of heat ineffect, It plays an important role in selection pressure and the frequency of thermoacousticrefrigeration efficiency.The summary of this thesis and the disadvantages are introduced. And listed a fewresearch achievements, innovatively designed a micro heat enhanced sound refrigerator,Characteristics of refrigerating machine are investigated by numerical simulation analysis...