TY - GEN
T1 - Generation of fine particulates in packed granular bed in the Carbon Dioxide Removal Assembly (CDRA)
AU - Zeng, Xiangwu
AU - Juan, H. Agui
AU - He, Chunmei
PY - 2006
Y1 - 2006
N2 - One of the most pressing micro-gravity issues related to air revitalization systems is the generation and migration of fine particulates downstream of a reactor bed. It has been reported that particulate fines caused the failure of desiccant/adsorbent beds in maintaining a vacuum during desorb cycles as well as causing Carbon Dioxide Removal Assembly (CDRA) selector valves to experience transition problems. There are five possible sources for the generation of these fine particulates: they may exist in the initial Zeolite material, they may be produced during compaction of the Zeolite bed, they may be generated during transportation of the bed, they may result from the increased stresses induced by the high level of acceleration during the launch of a rocket or space shuttle, and they may be caused by the breakup of particles resulting from thermal stresses during a space flight. The identification of the main sources of the fine particulates so as to provide a basis for engineering countermeasures, and an effective non-intrusive technique that can continuously monitor the health status of the CDRA system are essential to the future extraterrestrial exploration missions of NASA. This paper reports the results of a study on the generation of fine particles under different stress levels and stress cycles. Particle size analyses were conducted to determine the contents of fines in the Zeolite material before and after the application of different stress intensities and cycles. In addition, we are making an effort to develop a non-intrusive technique that can be configured for real-time health monitoring of the CDRA system using wave velocity measurement.
AB - One of the most pressing micro-gravity issues related to air revitalization systems is the generation and migration of fine particulates downstream of a reactor bed. It has been reported that particulate fines caused the failure of desiccant/adsorbent beds in maintaining a vacuum during desorb cycles as well as causing Carbon Dioxide Removal Assembly (CDRA) selector valves to experience transition problems. There are five possible sources for the generation of these fine particulates: they may exist in the initial Zeolite material, they may be produced during compaction of the Zeolite bed, they may be generated during transportation of the bed, they may result from the increased stresses induced by the high level of acceleration during the launch of a rocket or space shuttle, and they may be caused by the breakup of particles resulting from thermal stresses during a space flight. The identification of the main sources of the fine particulates so as to provide a basis for engineering countermeasures, and an effective non-intrusive technique that can continuously monitor the health status of the CDRA system are essential to the future extraterrestrial exploration missions of NASA. This paper reports the results of a study on the generation of fine particles under different stress levels and stress cycles. Particle size analyses were conducted to determine the contents of fines in the Zeolite material before and after the application of different stress intensities and cycles. In addition, we are making an effort to develop a non-intrusive technique that can be configured for real-time health monitoring of the CDRA system using wave velocity measurement.
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U2 - 10.2514/6.2006-1334
DO - 10.2514/6.2006-1334
M3 - Conference contribution
AN - SCOPUS:34250760265
SN - 1563478072
SN - 9781563478079
T3 - Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
SP - 16163
EP - 16171
BT - Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
T2 - 44th AIAA Aerospace Sciences Meeting 2006
Y2 - 9 January 2006 through 12 January 2006
ER -