The present work investigates the turbulent jet flow mixing of downward
impinging jets within a staggered rod bundle based on previous experimental work.
The two inlet jets had Reynold's numbers of 11,160 and 6,250 and were chosen to
coincide with the available data. Steady state simulations were initially carried out
on a semi-structured polyhedral mesh of roughly 13.2 million cells following a
sensitivity study over six different discretized meshes. Very large eddy simulations
were carried out over the most refined mesh and continuous 1D wavelet transforms
were used to analyze the dominant instabilities and how they propagate through the
system in an effort to provide some insight into potential problems relating to
structural vibrations due to turbulent instabilities. The presence of strong standing
horseshoe vorticies near the base of each cylinder adjacent to an inlet jet was noted
and is of potential importance in the abrasion wear of the graphite support columns
of the VHTR if sufficient wear particles are present in the gas flow.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2010-05-7796 |
| Date | 2010 May 1900 |
| Creators | Salpeter, Nathaniel O. |
| Contributors | Hassan, Yassin A. |
| Source Sets | Texas A and M University |
| Language | English |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | application/pdf |
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