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Investigation of methods to produce a uniform cloud of fuel particles in a flame tubeThe combustion of a uniform, quiescent cloud of 30-micron fuel particles in a flame tube was proposed as a space-based, low-gravity experiment. The subject is the normal- and low-gravity testing of several methods to produce such a cloud, including telescoping propeller fans, air pumps, axial and quadrature acoustical speakers, and combinations of these devices. When operated in steady state, none of the methods produced an acceptably uniform cloud (+ or - 5 percent of the mean concentration), and voids in the cloud were clearly visible. In some cases, severe particle agglomeration was observed; however, these clusters could be broken apart by a short acoustic burst from an axially in-line speaker. Analyses and experiments reported elsewhere suggest that transient, acoustic mixing methods can enhance cloud uniformity while minimizing particle agglomeration.
Document ID
19900009349
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Siegert, Clifford E.
(NASA Lewis Research Center Cleveland, OH., United States)
Pla, Frederic G.
(Sverdrup Technology, Inc., Cleveland OH., United States)
Rubinstein, Robert
(Sverdrup Technology, Inc., Cleveland OH., United States)
Niezgoda, Thomas F.
(NASA Lewis Research Center Cleveland, OH., United States)
Burns, Robert J.
(NASA Lewis Research Center Cleveland, OH., United States)
Johnson, Jerome A.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1990
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.15:102376
E-5110
NASA-TM-102376
Accession Number
90N18665
Funding Number(s)
PROJECT: RTOP 694-24-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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