Computational Fluid Dynamics Methodologies for Simulation of Chemical Oxygen-Iodine Laser Flowfields
Madden, Timothy John
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https://hdl.handle.net/2142/85126
Description
Title
Computational Fluid Dynamics Methodologies for Simulation of Chemical Oxygen-Iodine Laser Flowfields
Author(s)
Madden, Timothy John
Issue Date
1997
Doctoral Committee Chair(s)
Solomon, Wayne C.
Department of Study
Aerospace Engineering
Discipline
Aerospace Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Fluid and Plasma
Language
eng
Abstract
Simulation of chemical lasers such as the chemical oxygen-iodine laser (COIL) is of timely interest due to the recent acceleration of the airborne laser military research program and ongoing commercial development programs. As a part of these efforts, a 3-D COIL simulation model was developed based on the Computational Fluid Dynamics (CFD) code GASP which solves the conservative, finite-volume formulation of the full Navier-Stokes equations coupled to a finite-rate non-equilibrium chemistry model. The GASP code was improved to need the demands of COIL simulation by the addition of a conservative, multicomponent molecular diffusion model to ensure accurate molecular diffusion transport modelling. Additionally, a 13 reaction, 10 species finite rate chemistry model was developed with the GASP thermo-chemical database for use with chemistry modelling capability. A series of 3-D simulations of the COIL flowfield were performed and compared to detailed species distributions measurements from experiment for the purposes of validation using a unique averaging technique that mimics the actual physics of the experimental gain measurement. These detailed comparisons demonstrate that the simulation model accurately predicts the experimentally measured distributions, a significant result in 3-D simulation of reacting flows. Important findings from the validated simulations include: strong evidence indicating the presence of H$\sb2$O condensation in the COIL mixingnozzle, establishing the mechanism for mixing between the primary and secondary streams as being a combination of the diffusive mixing and distortion of the secondary jet after penetration into the primary flow resulting in rapid O$\sb2(\sp1\Delta)$ mixing into the secondary fluid, establishing the I$\sb2$ dissociation process as chemistry limited for the COIL configuration investigated here, and demonstrating that pressure gradient diffusion is not a significant factor in the COIL flowfield. Future work incorporating a power extraction model in the simulations and further examination of the issue of H$\sb2$O condensation is suggested.
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