3D laser absorption imaging of species and temperature in supercritical flames
Abstract
Combustion at supercritical pressures is essential to current and future Air Force propulsion systems due to the acute need for high power density and efficiency. Supercritical mixing and combustion are difficult to model, and quantitative diagnostics paired with controlled high pressure experiments are critical to model advancement. The primary research objective of the proposed effort is to enable and apply a novel three dimensional, quantitative imaging technique for species and temperature in high pressure reacting flows, up to 100 atm. We propose to achieve this objective via two advancements in laser diagnostics. First, state of the art laser absorption spectroscopy (LAS) methods will be expanded in spatial resolution capability by utilizing highspeed infrared cameras to image flow fields backlit with tunable infrared laser radiation. The laser absorption imaging (LAI) technique provides for spectrally, spatially, and temporally rich datasets that can be reconstructed using tomographic methods. Second, we will exploit non ideal radiative properties at high gas densities to extend laser absorption spectroscopy techniques to pressures greater than 100 atm for multiple combustion species. In this project, we combine this novel imaging and high pressure spectroscopic strategy for simultaneous measurements of both flame structure and quantitative thermochemistry (temperature, species concentrations) at supercritical conditions (> 50 atm), providing unique capability that does not exist with current diagnostic methods.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 14, 2022
- Source ID
- FA95501910062
Entities
People
- R. Mitchell Spearrin
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of California, Los Angeles