Study On The Thermoacoustic Resonator With External Excitation

With the developing of electronics and photoelectronics, the limit on the design and manufacture technique of the traditional cooler can satisfaction of wants not any longer. Hence, the new refrigeration mode must be searched for and more dependable refrigeration fashion must be adopted.In recent years, research on thermoacoustic engine has attracted significant attention and has been a new research hotspot due to the advantages of its simplicity, non-moving components, high reliability and environmental safety.However, there is a major technical hitch of the tradition thermoacoustic engine, it is essentially affected by two parameters. One is the too low volume-power ratio of the system, resulting in a big volume for the engine, the other is the low thermoacoustic energy conversion efficiency, the COP/COPcarnot is only 5%.To develop the technique of thermoacoustic engine, these problems must be solved. One is to add the traveling wave component, the other way is to enlarge the impedance of the regenerator. So firstly, the themoacoustic system is described by the network model on the basis of thermodynamics theory, and the quality factor Q is chose to be a criterion to measure the quality of the themoacoustic resonator and regeneration. According to this criterion, a thermoacousitc cooler model is presented, which adopts flat section resonator. The model is anticipated to be driven by distributed loads, to amplify the pressure oscillation amplitude and to enhance the coefficient of the system.Finite element analysis software is used to analyse the oscillation character of different resonator structure models which is designed. The inherence frequencies and the first to fourth steps of oscillation models are calculated, and discuss the relationship between the inherence frequency and young's modulus of elasticity as well as the density of different materials. Based on the discussion, PVC has been chosen to calculate oscillating regime particularly. The results are presented. It is clearly predicted that the series of distributed loads applied on 2 kinds of resonators cause different vibration effect, and achieve anticipated aim. The compressibility and quality factor of porous medium such as glass wool fiber which is used as the regeneration material has been investigated through experiment, the agreement between experimental results and theory is good. The relationship among compressibility, quality factor and frequency of system is also presented.