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Repeatability of Cryogenic Multilayer InsulationDue to the variety of requirements across aerospace platforms, and one off projects, the repeatability of cryogenic multilayer insulation has never been fully established. The objective of this test program is to provide a more basic understanding of the thermal performance repeatability of MLI systems that are applicable to large scale tanks. There are several different types of repeatability that can be accounted for: these include repeatability between multiple identical blankets, repeatability of installation of the same blanket, and repeatability of a test apparatus. The focus of the work in this report is on the first two types of repeatability. Statistically, repeatability can mean many different things. In simplest form, it refers to the range of performance that a population exhibits and the average of the population. However, as more and more identical components are made (i.e. the population of concern grows), the simple range morphs into a standard deviation from an average performance. Initial repeatability testing on MLI blankets has been completed at Florida State University. Repeatability of five GRC provided coupons with 25 layers was shown to be +/- 8.4 whereas repeatability of repeatedly installing a single coupon was shown to be +/- 8.0. A second group of 10 coupons have been fabricated by Yetispace and tested by Florida State University, through the first 4 tests, the repeatability has been shown to be +/- 16. Based on detailed statistical analysis, the data has been shown to be statistically significant.
Document ID
20170008743
Acquisition Source
Glenn Research Center
Document Type
Presentation
Authors
Johnson, W. L. (NASA Glenn Research Center Cleveland, OH United States)
Vanderlaan, M. (National High Magnetic Field Lab. Tallahassee, FL, United States)
Wood, J. J. (Yetispace, Inc. Huntsville, AL, United States)
Rhys, N. O. (Yetispace, Inc. Huntsville, AL, United States)
Guo, W. (National High Magnetic Field Lab. Tallahassee, FL, United States)
Van Sciver, S. (National High Magnetic Field Lab. Tallahassee, FL, United States)
Chato, D. J. (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
September 11, 2017
Publication Date
July 12, 2017
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
GRC-E-DAA-TN43917
Meeting Information
Meeting: 2017 Cryogenic Engineering Conference
Location: Madison, WI
Country: United States
Start Date: July 9, 2017
End Date: July 13, 2017
Sponsors: Centennial Conferences
Funding Number(s)
WBS: WBS 448887.04.03.03
CONTRACT_GRANT: NNL12AA09C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
multilayer insulation
Cryogenic propellants
cryogenic fluid management

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