Controlling soil disturbance of a lunar regolith simulant bed during depressurization in a vacuum chamber.

Abstract:

:A dusty thermal vacuum chamber (DTVC) containing a regolith simulant bed is essential for testing equipment and techniques related to lunar surface exploration. Space agencies have been reluctant to operate a DTVC because of the challenge of controlling soil disturbance of the lunar regolith simulant bed during pumping down or depressurization, which may contaminate or even damage the chamber and vacuum equipment. There appears to be no previously available solution to this problem, or how to avoid it. We investigated the mechanism of soil disturbance during depressurization and established a criterion for evaluating its occurrence. The proposed criterion was validated by extensive experiments and numerical modelling to simulate air evacuation from soil voids. There is a critical pressure difference (CPD) between the top and bottom of the lunar regolith simulant bed that causes soil disturbance during depressurization. We found a simple equation estimating the CPD and further provided guideline on the optimum depressurization rate to avoid soil disturbance before the target vacuum level is achieved under varying soil conditions.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Go GH,Lee J,Chung T,Ryu BH,Jin H,Zhuang L,Shin HS,Kim JH,Yun TS

doi

10.1038/s41598-021-81317-1

subject

Has Abstract

pub_date

2021-01-21 00:00:00

pages

1878

issue

1

issn

2045-2322

pii

10.1038/s41598-021-81317-1

journal_volume

11

pub_type

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