Numerical simulations of a three dimensional diamond jet interaction flowfield at
various diamond injector half angles into a supersonic crossflow were presented in this
thesis. The numerical study was performed to improve the understanding of the flame
holding potential by extending the numerical database envelop to include different
injector half angles and examine the flow at Mach 2 and Mach 5. The configuration of a
diamond injector shape was found to reduce the flow separation upstream, and produce
an attached shock at the initial freestream interaction and the injection fluid has an
increased field penetration as compared to circular injectors. The CFD studies were also
aimed at providing additional information on the uses of multiple injectors for flow
control.
The numerical runs were performed with diamond injectors at half angles of 10ð and
20ð at a freestream Mach number of 5. The transverse counter-rotating pair of vortices
found in the 15ð does not form within the 10ð and 20ð cases at freestream Mach number
5. The 10ð case had a barrel shock that became streamlined in the lateral direction. The
20ð barrel shock had a very large spanwise expansion and became streamlined in the
transverse direction. In both cases the trailing edge of their barrel shocks did not form the flat âÂÂVâ shape, as found in the baseline case. At Mach 2 the 10ð and 15ð cases both
formed the flat âÂÂVâ shape at the trailing edge of the barrel shocks, and formed the
transverse counter rotating vortex pairs.
The 10ð multiple injector case successfully showed the interaction shocks forming
into a larger planer shock downstream of the injectors. The swept 15ð case produced
interaction shocks that were too weak to properly form a planar shock downstream. This
planar shock has potential for flow control. Depending on the angle of incidence of the
injector fluid with the freestream flow and the half angle of the diamond injector, the
planar shocks will form further upstream or downstream of the injector.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/4270 |
| Date | 30 October 2006 |
| Creators | McLellan, Justin Walter |
| Contributors | Bowersox, Rodney D.W. |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | 6265317 bytes, electronic, application/pdf, born digital |
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