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Research and Design of Loudspeaker-driven Thermoacoustic Refrigerator

Author: LiuChangJian
Tutor: LiQing
School: Huazhong University of Science and Technology
Course: Refrigeration and Cryogenic Engineering
Keywords: Thermoacoustic refrigerator Speaker driver Inverting CFD simulation
CLC: TB651
Type: Master's thesis
Year: 2009
Downloads: 54
Quote: 1
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Abstract


Thermoacoustic refrigerator has a simple structure , reliable operation , the use of non-polluting industrial quality characteristics , a new technology solutions to the refrigeration cryogenic field . The speaker has the advantages of low cost , widely used and easily available , so the power unit to drive the speaker as a thermoacoustic refrigerator become a hot research topic . The paper first reviews the history and background of the thermoacoustic engine and thermoacoustic theory , focuses on the study on the speaker driver thermoacoustic refrigerator . Then focus on the sound design of the drive . By theoretical analysis, to adjust the magnitude and phase of the impedance of the speaker outlet , the electro-acoustic conversion efficiency of the speaker can be improved . Theoretically, the outlet of the speaker impedance the closer to the phase of the traveling wave , the greater the impedance magnitude , the higher the efficiency of the electro-acoustic converter of the speaker . Generally, only the front of the speakers of the acoustic power of the radiation from being used , but actually , a speaker both sides are radiation aloud function . In order to take advantage of the speaker pros and cons on both sides of the acoustic power radiated acoustic network model to analyze the design inverted sound drive structure , making the speaker pros and cons on both sides of the acoustic power radiated through the superimposed play a mutually reinforcing effect , thereby increasing the speaker driver warm-up the cryocooler of electro-acoustic conversion efficiency. DeltaE thermoacoustic of one-dimensional numerical simulation software to set up a quarter-wavelength sound driver simulation model of the thermoacoustic refrigerator . Thermoacoustic refrigerator operating parameters and structural parameters optimization regenerator arrangement should be near the pressure the belly point , and the room temperature end should point to the pressure antinodes . Thermoacoustic refrigerator model has been established on the basis of the one-dimensional numerical simulation of two - dimensional CFD simulation using the CFD simulation software Fluent commercialization successful simulation of nonlinear phenomena in the refrigerator to guide we improve the design of the refrigerator . Finally, the development of a loudspeaker -driven thermoacoustic refrigerator , and to establish the experimental platform preliminary experimental study .

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CLC: > Industrial Technology > General industrial technology > Refrigeration Engineering > Refrigeration machinery and equipment > Refrigerator
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