High Frequency Thermoacoustic Oscillators And The Characteristic Of Array Resonator

With the advantages of simple structure, convenient maintain, low cost, no or littlemoving parts, higher reliability, and pollution-free to the environment, thermoacouticoscillators became more and more active in energy conversion and management.Especially with the small size of high frequency self-excited thermoacoutic oscillators andsound driven thermoacoustic refrigerator, they could obtain higher power density, whichmade them more suitable for use in miniature electronic devices for heat dissipation. In theaspects of using low-temperature heat source driven thermoacoutic refrigeration,thermoacoutic driven pulse tube refrigeration and heat transportation, thermoacouticoscillators have showed wide application prospects. In this paper, the high frequencythermoacoutic oscillator was simulated based on the method of thermal dynamic network;the main contents include the following aspects:First of all, the present research situation of high frequency thermoacoutic technologywas introduced and the advantages and disadvantages of the existing achievements wereanalyzed. Following this, the topic and significance of this paper were put forward.Then, based on the basic simulation equations, the simulation program was designedto calculate high frequency thermoacoutic oscillators. According to the program, thesound-driven thermoacoustic refrigerator and heat-driven self-excited oscillator weresimulated and their frequency and sound field characteristics were analyzed. Emphatically,how the parameters of the stack and the operation condition affect the performance of thesystem was analyzed. From the analysis results, we could obtain the optimal parameters ofthe stack and the operating conditions for good performance. Meanwhile, the simulationof a single thermoacoustic oscillator provided good guidance for thermoacoutic arraysystem.And then, the frequency characteristics and the acoustic distribution of the arrayresonant cavities in resonant tube were analyzed, and the impact of the array cavities tothermoacoutic oscillation system was discussed, from which the restrain effects tononlinear phenomena such as high order harmonic wave were verified. After these,different structures of two column resonance resonators in thermoacoutic system were simulated with the analysis of its influences to the system characteristics, which providedvaluable reference to thermoacoutic array system.Finally, the theoretical basis of the synchronization phenomenon and its applicationin the use of thermoacoustic oscillator were illustrated. And based on the theory, theexperiment prototype was established and the corresponding test system was introduced.At last, basic experimental schemes were put forward to do the research ofsynchronization and coupling to two column self-exited thermoacoutic oscillators.