Investigation on regenerator temperature inhomogeneity in Stirling-type pulse tube cooler |
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Authors: | DaMing Sun Dietrich Marc Thummes Guenter LiMin Qiu |
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Institution: | (1) Institute of Refrigeration and Cryogenics of Zhejiang University, Hangzhou, 310027, China;(2) Institute of Applied Physics, University of Giessen, Giessen, D-35392, Germany;(3) TransMIT-Centre for Adaptive Cryotechnology and Sensors, Giessen, Germany |
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Abstract: | Regenerator is one of the most crucial components to pulse tube cooler (PTC) and thermoacoustic engine. As such regenerator
is scaled up to high-power, the thermal and hydrodynamic communication transverse to the acoustic axis gets weaker and weaker.
Under this condition, any unsymmetric factor could cause serious instability to the cooler or engine, which degrades their
performance. Investigation has been carried out on a high-power two-stage thermal-coupled U-shape Stirling-type PTC. By detailed
circumferential temperature measurements along the middle heat exchanger and second stage regenerator, a kind of temperature
inhomogeneity caused by unsymmetric pre-cooling effect of inter-stage thermal bridge was found in the lower part of the regenerator
of the PTC. The temperature inhomogeneity originating from the middle heat exchanger of the second stage regenerator amplified
itself in the lower part of the regenerator and then internal streaming formed. The maximal radial temperature difference
could reach 30–40 K. Experimental results show that the temperature inhomogeneity intensifies with increased pre-cooling power
and its direction can be reversed by changing the pre-cooling effect of the first stage PTC to heating effect by using external
thermal load. This research shows that it is important to maintain the heating or cooling effects of heat exchangers uniform
in high-power regenerative coolers and engines.
Supported by the German Ministry of Economics and Technology (BMWi) (Grant Nos. 03SX221A) and German Academic Exchange Service
(DAAD) Foundation |
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Keywords: | pulse tube cryocooler high-power regenerator |
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