A high-performance thermoacoustic refrigerator operating in room-temperature range

The working principle of an efficient travelling- wave thermoacoustic refrigerator operating in room-temperature range has been analyzed and an experimental set-up has been built. The experiment showed that suppressing DC-flow streaming was very critical to efficient operation, and an elastic membrane was used to solve the problem successfully. At the most efficient operating point, the novel thermoacoustic refrigerator achieved a cooling capacity of about 80 W at -20℃, with a much higher efficiency than previously developed standing-wave thermoacoustic refrigerator.     

A thermoacoustically driven cooler capable of reaching temperature below 77 K with no moving part

The pulse tube cooler has no cryogenic displacer and has attracted lots of attention in the field of cryocooler research. On the other hand, the thermoacoustic engine can generate self-oscillation and output work .without moving components. Combining both technologies leads to a cryogenic cooler system with no moving components at all,     

热声技术研究进展

热声技术是基于热致声效应的一种技术,它可以将热能转化为声能,进而用于发电或制冷等.特别是热声发电技术是一种全新的热发电技术,可将热能转化为声能并直接由直线发电机等换能设备产生电能.……     

回热式低温制冷研究进展

 很多特殊的物理现象伴随着低温而出现,低温技术正逐渐渗透到社会生活中的很多领域。回热式制冷作为两类主流低温制冷技术之一,主要包括斯特林制冷机、G-M 制冷机、脉冲管制冷机3 种结构形式。前两种结构技术成熟,但在寿命或效率方面有一定的不足;脉冲管制冷机可靠性和效率均较高,近年来发展最为迅猛。热声理论从声波与固壁相互作用的角度解释了回热式制冷的工作机制,正逐步发展成为研究回热式制冷的统一的理论工具,同时也使一种新的回热式制冷机结构--热声制冷机诞生。其中,双作用热声制冷可能存在较大的发展前景。目前回热式制冷正呈现多热点的发展趋势。回热式制冷在不断拓展应用的同时也在不断深化内在的科学问题研究,改进自身结构,孕育新的发展的机会。     

An acoustical pump capable of significantly increasing pressure ratio of thermoacoustic heat engines

A thermoacoustic heat engine is a new device pow- ered by differential-temperature heat energy. It is highly reliable without any moving part and is now becoming an ideal driving source of pulse tube refrigerators or thermoacoustic refrigerators. Most of …     

A high pressure-ratio, energyfocused thermoacoustic heat engine with a tapered resonator

Heat energy with temperature difference may lead to self-excited acoustical oscillation under appropriate condition, which is called “thermoacoustic phenomenon”. The physical phenomenon was observed about two hundreds years ago. However, the research on high-energy thermoacoustic devices was begun only about a decade ago.Thermoacoustic machines use inert gases as working medium and have no moving mechanical pans; consequently they are really environment-friendly and highly reliable.The efficiencies of thermoacoustic machines are now greatly improved, close or even higher than that of conventional heat engines.     

A novel coupling configuration for thermoacoustically-driven pulse tube coolers： Acoustic amplifier

A thermoacoustically-driven pulse tube cooler has re-cently reached temperatures below 77 K[1] by modifying the resonance tube of the thermoacoustic engine and the hot end phase adjuster of the pulse tube cooler. Normally, the pulse tube cooler is directly connected with the ther-moacoustic engine so that pressure ratio available to the pulse tube cooler is limited by what the thermoacoustic engine can provide[1,2]. To obtain temperatures below 70 K, the high frequency pulse tube cooler genera…