Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Laser diagnostic"”.
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Laser Diagnostic Techniques with Ultra-High Repetition Rate for Studies in Combustion Environments
When conducting laser based diagnostics in combustion environments it is often desirable to obtain temporally resolved information. This can be due to several factors such as combustion taking place in a turbulent flow field, flame propagation from a spark plug in an initially quiescent combustible …
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Development of novel laser diagnostic techniques for the quantitative study of premixed flames
… concerns the development and application of laser diagnostic techniques for accurate temperature measurements and for the determination of flamefront properties in premixed flames that can serve as input data for computational fluid dynamical (CFD) models in technical combustion. The work …
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Laser diagnostic investigation of the structure of steady and driven hydrogen jet diffusion flames
… coherent anti-Stokes Raman scattering (CARS) and laser-induced fluorescence (LIF) to obtain temperature and nitric oxide (NO) concentrations in steady laminar flames and during the interaction of induced fuel-side vortices with the diffusion flame sheet. The accuracy of the CARS system was …
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Pyrolysis oil combustion characteristics and exhaust emissions in a swirl-stabilized flame
… speed imaging of flame luminosity and several laser diagnostic methods including Mie scattering, hydroxyl radical planar induced fluorescence (OH-PLIF), fuel planar laser-induced fluorescence (Fuel-PLIF), and laser induced incandescence (LII). Spray characteristics have been investigated by …
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Occupant tenability in large-scale residential fires: an analysis of heat exposure, toxic gases, water application, and fire-service ventilation
… trapped occupants. Additionally, a tunable diode laser absorption spectroscopic technique was employed to measure water vapor in the fire environment. Twenty-four experiments were performed in identical one-story structures with ignition occurring in the bedroom(s) at Underwriters Laboratories in …
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Diode laser gas sensing for high-speed temperature and speciation measurements inside explosive fireballs
… of a wide variety of proven tunable diode laser absorption techniques in explosive applications. In addition, details of the theory, application, and data analytics for the relevant spectroscopic measurements are also addressed. The developed hardware and technique were used to measure …
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Studies of premixed turbulent flames under flamelet assumptions
… on a turbulent piloted Bunsen flame by the 2D laser diagnostic. A number density method was defined to detect flame edges from particle Mie scattering images so that a high-speed PIV system could provide both velocity field and instantaneous flame edges with an acceptable uncertainty. By that, …
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Development of high-speed laser diagnostics for the study of advanced propulsion systems
… this effort that the progressing capabilities of laser diagnostics open new possibilities of exploring the chemistry and fluid dynamics of complex reacting flows. The primary objective of this study is to develop and apply kHz-rate planar imaging to further our understanding of ignition and flame …
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Air/fuel mixing enhancement and emission reduction through intake port design and various fuel emulsions for diesel combustion
… has rarely been reported. In this work, various laser diagnostic methods were applied to capture the spray and combustion characteristics of fuels with additives and as such, the observed phenomena were correlated with other combustion features. The findings will be important towards the …
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Swirl-stabilized lean-premixed flame combustion dynamics: An experimental investigation of flame stabilization, flame dynamics and combustion instability control strategies
… of combustion radicals has been a cornerstone diagnostic for the field of combustion for the past two decades which allows for visualization of flame structure and behavior. However, resolving both temporal and spatial structures from image-based experimental data can be very challenging. Thus, …
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Investigation of Long-timescale Behavior of Positive DC Streamer Coronas
… field inside a streamer corona using the E-FISH laser diagnostic technique. This shows some surprising results, which do not seem to be consistent with the theory of DC streamer selfpulsation being driven by electric field recovery at the anode. The near-anode electric field is not observed to …
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Modeling Three Reacting Flow Systems with Modern Computational Fluid Dynamics
… gas turbine combustor using advanced laser diagnostics. However, these data were taken by different investigators at BYU over the course of 10 years, and the data were scattered through several publications, theses, and dissertations. This third project was to compile these data into a …