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【期刊论文】Investigation on a thermoacoustically driven pulse tube cooler working at 80K
邱利民, L. M. Qiu*, D. M. Sun, W. L. Yan, P. Chen, Z. H. Gan, X. J. Zhang, G. B. Chen
Cryogenics 45(2005)380-385,-0001,():
-1年11月30日
The pulse tube cooler (PTC) driven by a thermoacoustic engine can completely eliminate mechanical moving parts, and then achieves a simpler and more reliable device. A Stirling thermoacoustic heat engine has been constructed and tested. The heat engine can generate a maximal pressure ratio of 1.19, which makes it possible to drive a PTC and get good performance. Frequency is one of the key operating parameters, not only for the heat engine but also for the PTC. In order to adapt to the relatively low design frequency of the PTC, the operating frequency of the thermoacoustic heat engine was regulated by varying the length of the resonance tube. Driven by the thermoacoustic engine, a single stage double-inlet PTC obtained the lowest refrigeration temperature of 80.9K with an operating frequency of 45Hz, which is regarded as a new record for the reported thermoacoustically driven refrigerators.
Thermoacoustics (, C), , Pulse tube cooler (, E), , Frequency match (, D),
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【期刊论文】A separate two-stage pulse tube cooler working at liquid helium temperature
邱利民, QIU Limin, HE Yonglin, GAN Zhihua, WAN Laihong & CHEN Guobang
Chinese Science Bulletin Vol. 50 No.1 January 2005,-0001,():
-1年11月30日
A novel 4K separate two-stage pulse tube cooler (PTC) was designed and tested. The cooler consists of two separate pulse tube coolers, in which the cold end of the first stage regenerator is thermally connected with the middle part of the second regenerator. Compared to the traditional coupled multi-stage pulse tube cooler, the mutual interference between stages can be significantly eliminated. The lowest refrigeration temperature obtained at the first stage pulse tube was 13.8K. This is a new record for single stage PTC. With two compressors and two rotary valves driving mode, the separate two-stage PTC obtained a refrigeration temperature of 2.5K at the second stage. Cooling capacities of 508mW at 4.2K and 15W at 37.5K were achieved simultaneously. A one-compressor and one-rotary valve driving mode has been proposed to further simplify the structure of separate type PTC.
pulse tube cooler,, liquid helium.,
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【期刊论文】Experimental study of a large-scale multifunction thermoacoustic engine
邱利民, Qiu L. M. Sun D. M. Zhang W. Chen G. B. Gan Z. H. Yan W. L.
,-0001,():
-1年11月30日
It is a new way of thinking to drive a pulse-tube refrigerator or other thermoacoustic refrigerator by using thermoacoustic engine instead of mechanical compressors so as to completely eliminate moving parts of refrigeration system for more reliable operation. Ceperley first proposed the idea of traveling-wave thermoacoustic heat engine in 1979 [1] and practically realized by Swift in 1999 [2]. Because the thermoacoustic conversion process occurs in its regenerator is reversible and velocity is in phase with pressure, traveling-wave thermoacoustic engine can produce and transmit acoustic power with higher efficiency theoretically. A large-scale multifunction thermoacoustic engine has been designed and constructed in Zhejiang University with the maximal input power of 5kW. The preliminary results show that the self-made engine has lower onset temperature, higher pressure ratio and higher efficiency, compared with those of the standing-wave thermoacoustic heat engine. With the filling nitrogen of 0.9MPa, the maximal pressure ratio reaches 1.21 and the operation frequency is 25Hz.
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【期刊论文】Frequency characteristics of a 4K pulse tube cooler
邱利民, Qiu L. M.a, b, Thummes G.a
,-0001,():
-1年11月30日
Frequency effects on the performance of a two-stage 4K pulse tube cooler (PTC) have been extensively explored. The dependence of refrigeration temperature, cooling power and efficiency on the operating frequency of a 4K PTC are investigated and compared with those of G-M and Stirling coolers. The cooling performance can be considerably improved by frequency optimization. Cooling powers of 30W at 70K, 500mW at 4.2K (1.2Hz) and 20W at 65K, 590mW at 4.2K (1.1Hz) are obtained.
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【期刊论文】Valve timing effect on the cooling performance of a 4K pulse tube cooler
邱利民, L. M. Qiu a, b, G. Thummes a, *
Cryogenics 42(2002)327-333,-0001,():
-1年11月30日
Generally, a compressor together with a rotary valve system generates the pressure oscillation in GM-type cryocoolers. The timing of the rotary valve, which is one of the key operating parameters for cryocoolers, determines the relationship between intake andexhaust processes. A systematic investigation of valve timing effects on cooling performance of a two-stage 4K pulse tube cooler (PTC) is reported. The experiments show that the optimization of valve timing can considerably improve the cooling performance for both stages. For the same PTC, a performance comparison for operation on different compressors with various input powers ranging from 0.5 to 6.0kW is also presented.
Pulse tube (, E), , Liquidhelium (, B), , Valve timing
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