【作者】 欧阳录春；

【导师】 邱利民；

【作者基本信息】 浙江大学 ， 制冷及低温工程， 2004， 硕士

【摘要】 扬声器驱动热声制冷机是以声能作为动力源，利用热声效应获得制冷的装置。该制冷机具有结构简单、运行可靠、寿命长、对环境无污染等突出优点，在航天、航空，低温电子、超导、低温生物等众多领域具有十分广阔的应用前景。该制冷机中的声源主要包括连接在充满气体的共振管一端的扬声器、共振管适当位置放置着许多平行流道组成的板叠和冷、热端两个换热器。扬声器的作用在于使气体驻波频率维持在共振管的基频附近，声波使气体在板叠通道里压缩和膨胀形成振荡。振荡气体与板叠表面热交换进行声功泵热，系统通过板叠的冷、热端换热器与外界交换热量。 本文首先介绍了扬声器驱动热声制冷机的课题背景和研究意义，回顾了热声制冷的发展历史和研究现状，并对扬声器驱动热声制冷机的原理进行了说明，较为详细地介绍了热声制冷的基本理论。在原有的扬声器驱动热声制冷机的基础上，通过改进获得了27℃的温降，这是目前国内所报道的最好结果，并从理论上对此结果进行了解释。 最后，针对原有试验台自身存在的缺陷，本文设计搭建了一台热声制冷机，并对其结构进行了详细介绍，用专业软件DeltaE对其性能进行了预测，计算结果表明：该制冷机性能均符合设计要求。针对当前扬声器驱动热声制冷机COP值较低的现状，提出了采用稀有气体的混合气体作为制冷工质。理论计算表明，使用混合工质有望大幅提高扬声器驱动热声制冷机的COP值。更多还原

【Abstract】 The thermoacoustic refrigerator driven by the loudspeaker takes advantage of thermoacoustic effect to obtain refrigeration. The refrigerator is easy to construct, reliable, long-life and friendly to environment. It is expected to be widely applied in aerospace, cryo-electronics, superconductivity, cryobiology and so on. The acoustic driver consists of a loudspeaker attached to one end of gas filled resonance, stacks of parallel channels placed in proper position of the resonance, cold and hot heat exchangers. The loudspeaker keeps the frequency of the standing wave around the basic frequency. The gas experiences compression and expansion in the stack channels, and so the gas oscillation is formed. The heat is transferred between the oscillating gas and the surface of the stack and is pumped from the cold to the hot end. The hot and cold heat exchangers transfer heat between the refrigerator and the environment.Firstly, the background and significance of the research of the thermoacoustic refrigerator are given. The history and the present state are summarized in brief. And the principle of the thermoacoustic refrigerator is also introduced for further discussion. Secondly, important modification have been done on the previous refrigerator and a temperature drop of 27C has been obtained, which is the best result reported in China. Finally, to further improve the performance of the refrigerator, a new thermoacoustic refrigerator is designed. The performance of the refrigerator is calculated by the DeltaE program. And the simulation results agree with the requirement of the design. To increase the COP of present thermoacoustic refrigerator, the idea to use the mixture of noble gases is proposed. The theoretical calculation shows that the COP of refrigerator can be significantly increased by using appropriate gas mixture.更多还原