Characterizing temperature fields and species evolution inside explosive fireballs is crucial for providing constraints for model refinement and extending the current understanding of detonation afterburn chemistry. Nitromethane is of interest due to its wide variety of automotive, industrial, and military applications, including as a propellant for rockets. This effort looked to provide accurate characterization of temperature and species evolution inside of a fireball using laser absorption spectroscopy techniques. Recent advances in laser absorption spectroscopy are leveraged to make MHz-rate measurements of temperature and species concentration following the detonation of nitromethane in a controlled environment. A Fixed-Wavelength Tunable Diode Laser Absorption Spectrometer (FW-TDLAS) was developed and characterized before being interfaced with the AFRL's detonation afterburn test facility. Laser diagnostics offer many advantages over traditional measurements techniques such as being non-intrusive and allowing for time-resolved measurements of temperature and multiple species. H2O was targeted at two wavelengths in the mid-infrared to quantify the localized temporal evolution of species and temperature inside the fireball and afterburn of nitromethane. Additional diagnostics were added to allow for CO species evolution to be targeted and resolved as well.
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Vasu Sumathi, Subith
Master of Science in Aerospace Engineering (M.S.A.E.)
College of Engineering and Computer Science
Mechanical and Aerospace Engineering
Aerospace Engineering; Thermofluid Aerodynamic Systems
Length of Campus-only Access
Masters Thesis (Campus-only Access)
Khanal, Nishan, "Advanced Laser Absorption Spectroscopy For Temperature And Species Measurements In Nitromethane Detonation Afterburn" (2023). Electronic Theses and Dissertations, 2020-. 1812.
Restricted to the UCF community until August 2026; it will then be open access.