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Title:Computational Fluid Dynamics Methodologies for Simulation of Chemical Oxygen-Iodine Laser Flowfields
Author(s):Madden, Timothy John
Doctoral Committee Chair(s):Solomon, Wayne C.
Department / Program:Aerospace Engineering
Discipline:Aerospace Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Fluid and Plasma
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.
Issue Date:1997
Description:385 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997.
Other Identifier(s):(MiAaPQ)AAI9812689
Date Available in IDEALS:2015-09-25
Date Deposited:1997

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