Date of Award

Summer 2006

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Surendra N. Tiwari

Committee Member

Taj. O. Mohieldin

Committee Member

Sushil Chaturvedi

Call Number for Print

Special Collections; LD4331.E56 L84 2006

Abstract

Upstream interaction in a transient two-dimensional dual-mode scramjet engine is examined. This research is performed to compare completed and verified steady results with unsteady results in order to have a better understanding of the flow field. The flow is solved numerically with a Mach 2.5 free stream and sonic normal injection of hydrogen fuel emanating from facing walls while no symmetry assumptions were made. The free stream is modeled as vitiated air in order to produce comparable flight enthalpies and stagnation properties at the combustor inlet during flight conditions of approximately Mach 7. The vitiated stream consists of water vapor and carbon dioxide along with air. The convergence is slowed considerably due to the flow characteristics and complexities dealing with the effect of property coupling in high-speed viscous flows involving combustion along with the increased time necessary to solve the unsteady equations. Comparisons are made with steady flow results which have been verified previously with experimental results. The extreme asymmetry of the second order steady flow does not appear in the experimental results previously performed while the transient flow case produces a more symmetric flow field. The transient flow however does produce a degree of asymmetry and it will be seen that this lack of symmetry has also been shown in experimental results, although with slightly different geometry. The results produced using both transient and steady analysis appear to indicate that the asymmetric flow-structure is a physical phenomenon and not developed due to numerical modeling, although in the steady case there appears be numerical enhancement of the asymmetry.

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DOI

10.25777/0p5e-dq73

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