NDLI: Investigation on regenerator temperature inhomogeneity in Stirling-type pulse tube cooler

Content Provider	Springer Nature Link
Author	Sun, DaMing Marc, Dietrich Guenter, Thummes Qiu, LiMin
Copyright Year	2009
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.
Starting Page	986
Ending Page	991
Page Count	6
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	54
Issue Number	6
e-ISSN	18619541
Language	English
Publisher	SP Science in China Press
Publisher Date	2009-03-13
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	pulse tube cryocooler high-power regenerator Engineering Earth Sciences Chemistry/Food Science Physics Life Sciences Science
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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