CMCEC Life Test Results and Related Issues

Yuan, Shandong; Kuo, D. T.; Lody, T. D.

doi:10.1007/0-306-47919-2_12

Cited by 5 publications

(3 citation statements)

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“…Alcohol and acetone were brought into cooler due to the cleaning procedure of components. And the outgassing rate can be described by the exponential equation to the base e, which is consistent with the research achievements of Yuan [6,8,9] . …”

Section: Gaseous Contaminationmentioning

confidence: 78%

“…The failure modes, such as fatigue, leakage and piston wear, can be effectively controlled by improving design and screening processes. However, the gas contamination is still the most notorious cause of cooler's performance degradation, and a number of studies have been performed on the effect of gas contamination in cryocoolers [5][6][7][8][9][10] . Contamination has been thoroughly investigated and the control procedures have been recommended [5] , and several researchers have studied the effect of material outgassing [6,8,9] .…”

Section: Introductionmentioning

confidence: 99%

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Performance degradation of space Stirling cryocoolers due to gas contamination

Liu

Yang³

et al. 2011

SPIE Proceedings

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With extensive application of infrared detective techniques, Stirling cryocoolers, used as an active cooling source, have been developed vigorously in China. After the cooler's cooling performance can satisfy the mission's request, its reliability level is crucial for its application. Among all the possible failure mechanisms, gas contamination has been found to be the most notorious cause of cooler's performance degradation by failure analyses. To analyze the characteristic of gas contamination, some experiments were designed and carried out to quantitatively analyze the relationship between failure and performance. Combined with the test results and the outgassing characteristic of non-metal materials in the cryocooler, a degradation model of cooling performance was given byunder some assumptions, where t is the running time, T is the Kelvin cooling temperature, and T0, A, B are model parameters, which can be given by the least square method. Here T0 is the fitting initial cooling temperature, A is the maximum range of performance degradation, and B is the time dependent constant of degradation.But the model parameters vary when a cryocooler is running at different cooling temperature ranges, or it is treated by different cleaning process. In order to verify the applicability of the degradation model, data fit analysis on eight groups of cooler's lifetime test was carried out. The final work indicated this model fit well with the performance degradation of space Stirling cryocoolers due to gas contamination and this model could be used to predict or evaluation the cooler's lifetime. Gaseous contamination will not arouse severe performance degradation until the contaminants accumulate to a certain amount, but it could be fatal when it works. So it is more serious to the coolers whose lifetime is more than 10,000 h. The measures taken to control or minimize its damage were discussed as well. To the long-life cryocooler, internal materials must be baked and organic/epoxy materials should be used as few as possible. Further more, pipeline for filling working fluid must have purifying facilities.

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