Date of Award
Summer 1990
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Mechanical & Aerospace Engineering
Program/Concentration
Mechanical Engineering
Committee Director
S. K. Chaturvedi
Committee Member
A. S. Roberts, Jr.
Committee Member
S. N. Tiwari
Call Number for Print
Special Collections; LD4331.E56W43
Abstract
The mixing characteristic of a liquid oxygen (LOX) injector operating under nonideal thermodynamics conditions are analyzed. Oxygen, in supercritical state, is injected into a high pressure airstream flowing through a narrow annulus region of a hypersonic wind tunnel. The objective of the present study is to investigate conditions that would help produce a uniform profile of oxygen concentration at the end of a diverging mixing channel, located downstream of the injector section. Uniformity of oxygen concentration profile is critical to combustion processes that occur downstream of the LOX injector section.
The coupled velocity, temperature, oxygen concentration and enthalpy fields are computed by solving the transport equations for mass, momentum and energy. The turbulence effects are modeled by the two equation k-c turbulence model. The nonideal gas behavior is modeled by employing the Redlich-Kwong equation of state. The energy equation, written in terms of mixture enthalpy, is simplified by applying the ideal solution limit to the oxygen-nitrogen mixture. The governing equations in axi-symmetric form are solved by employing the finite volume method, and the resultant algebraic equations are linearized by the "SIMPLER" algorithm. A computer program based on "SIMPLER" algorithm is developed and applied to the cases involving simple parallel channel geometry, and constant density turbulent flows. However, for more complex geometry cases, and for cases involving large variation of density, the "FLUENT" code is used. The effects of LOX injector geometry, ambient turbulence intensity and injection angle are analyzed. The results indicate that for the chosen geometrical and operational parameters, a nearly uniform profile of 0 2 concentration is obtained at the end of the mixing channel.
Rights
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DOI
10.25777/ymyr-c087
Recommended Citation
Wei, W..
"Investigation of Mixing Characteristics of a LOX Injector Operating at Non-Ideal Thermodynamic Conditions"
(1990). Master of Science (MS), Thesis, Mechanical & Aerospace Engineering, Old Dominion University, DOI: 10.25777/ymyr-c087
https://digitalcommons.odu.edu/mae_etds/749