The High Frequency Miniature Standing-wave Thermoacoustic Refrigerator Basic Question Research

Low temperature refrigeration, largely depends on mechanical compressor.Therefore, life, reliability and so on are affected by a lot of. Thermoacousticrefrigeration is a new technology, have no moving parts, no wear and high reliability etc,have great application prospect.Paper describes the thermoacoustic refrigerator relevant background and thedevelopment of a standing wave thermoacoustic refrigerator. Thermoacoustic effectinvolves the basic knowledge of fluid mechanics, thermodynamics, acoustic.Thermoacoustic effect is introduced related theory and the implementation process, todescribe the internal heat transfer do stack to a standing wave thermoacousticrefrigerator is a cognitive system.Topics introduced taper pipe, analyzes different Angle cone tube, end pressureincreases after the first decreases with increase slope, relatively suitable Angle, Anglefor model. When the driving frequency and frequency close to design or consistent,there will be a resonance phenomenon, the maximum stress, the refrigeration efficiency.The resonance tube parts and pack design. To the characteristics of the refrigerationstack in the resonance tube placed a solid board, plate fold the left and right sides of thenear end set monitoring point, in a certain temperature gradient along the stack direction.Compare different pressure, temperature changes on both ends of the stack, pressureincrease, the temperature difference.First sound pressure and sound velocity simulated by FLUENT software designmodel, the open end of periodic cosine pressure, get consistent results and classicaltheory. Resonance tube into the single boards, temperature characteristic analysis, withthe pressure, the stack temperature increase at both ends. The standing-wavethermoacoustic refrigerator is introduced into stack and heat exchanger, porous media isused to simulate the hot and cold end heat exchanger, the temperature change along axis direction. Clearance monitoring in the stack, observation of the relationshipbetween temperature change over time in the gap of six symmetrical stack monitoring,middle and big temperature changes in both ends of small variations in temperature, themedium inside the analysis sheet pack clearance flow characteristics. Increment oraverage pressure ratio can improve the refrigeration efficiency.Finally, the paper made a summary, the introduction of cone tube to strengthensound pressure, and the thermoacoustic refrigerator related characteristics are simulated,and also points out the deficiency of the paper.