| Thermoacoustic engine(refrigerator)is a new type of energy conversion device has the advantages of low grade energy,no environmental pollution and high reliability.With the development of thermo acoustic refrigeration technology and the outstanding performance in the field of power engineering,it has great application prospects in the fields of high temperature superconductivity,space aviation,refrigeration and cryogenic engineering and medical treatment.Thermoacoustic engine in energy use and energy conversion has significant technical advantages,and thermal acoustic rich research results and good application prospect was shown to development of thermoacoustic theory research and thermoacoustic engine has a flourishing development.In full understanding and summary based on the thermoacoustic theory,respectively from the network model,time characteristics,finite time thermodynamic angle analysis the performance of dual source thermal acoustic refrigerating machine,on the basis of experimental analysis of the inflation pressure,resonance frequency,back effect of heat exchanger and mesh on the refrigeration temperature,and lay a theoretical and experimental basis for the engineering of the thermoacoustic refrigerator.The main researches include the following sections:From the derivation of basic equations of thermo acoustic,push the network transmission equation in the flow channel,on the basis of constructing the network model of dual source thermoacoustic refrigerator parts,and the network model of transmission matrix and dual source thermoacoustic refrigerator in various parts of the network.Through the establishment of the network model parameters distribution system for dual source thermoacoustic oscillation frequency,using impedance matching principle to calculate the sound sources of thermoacoustic system,the relationship between the two sources for the thermoacoustic refrigerator system,oscillation frequency and length of gas static pressure.From the change of similarity analysis method of gradual characteristic time of thermoacoustic system and points out that as an important characteristic parameter ofthermoacoustic system significance.In the finite time thermodynamic theory based on ecology as the regenerator performance objective function driven thermoacoustic refrigerator of double sound source analysis.The method of thermodynamic analysis of entropy generation analysis and finite time are intrinsically linked,to drive back double sound source entropy expression of heat flow and heat transfer in the process of thermoacoustic refrigerator is analysis of the effect of double acoustic driven thermoacoustic refrigerator characteristics and impedance matching time entropy rate.By using the method of finite time thermodynamics on the second law of thermodynamics performance as the optimization goal,analysis of variable temperature heat reservoirs is not reversible cycle performance of thermoacoustic refrigerator and thermodynamics,from the numerical analysis of the impact of the equilibrium position of the temperature gradient and tiny gas mass oscillation of thermoacoustic efficiency of refrigerator According to the practical experience of research on thermoacoustic device thermal acoustic theory and for many years,because the system optimized the single sound source driven the resonance tube boundary conditions and regenerator in the resonance tube in position adjustment is very tedious to double source thermoacoustic refrigeration machine,all parts of structure and operation parameters,some actual it is difficult to debug through the sound system of single sound source driver.Dual source system by two driving source,sound regulation system of flexible work.Finally,based on the existing laboratory experiment for dual source thermoacoustic refrigerator were carried out respectively according to the regenerator filler material selection,effects of air pressure,and the temperature difference between the resonant frequency of the sound pressure amplitude and resonant frequency,pressure amplitude and phase difference relationship and other aspects of the experiment,and the heat a cold end temperature theoretical calculation and experimental measurement results are compared. |
