CRF News - 2015 Issue 1

CRF News: 2015 Issue 1

This newsletter highlights recent activities at the Combustion Research Facility and includes feature stories, news and events, new website areas, and our latest publications.

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Combustion Research Facility News

Turbulent Mixed-Mode Combustion Studied in a New Piloted Burner


Sydney University has developed a variant of the well-known Sydney/Sandia piloted jet burner to address the needs of combustion models to accurately predict the behavior of mixed-mode combustors. This burner has enabled experiments on mixed-mode turbulent combustion in a configuration with well-defined boundary conditions critical for quantitatively testing models and better understanding the fundamental behavior of such flames.

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New Method Advances Combustion Modeling by Enabling Accurate Calculations of Transport Properties


Scientists increasingly turn to detailed chemical kinetic models to understand combustion’s complex chemistry. Very few of the thousands of parameters required for these models have been directly measured. Extrapolation using empirical trends has led to reliable estimates for some of the missing data, and a few key parameters have been empirically tuned to fit bulk combustion targets. Nonetheless, many gaps remain. To address this challenge, CRF scientists Ahren Jasper and Eugene Kamarchik teamed with James Miller and Stephen Klippenstein of Argonne National Laboratory to develop a new first-principles method for predicting collision integrals, fundamental quantities that underlie models of many bulk transport properties.

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First Ever Single-Shot Planar CARS Interrogation Spans an Unprecedented 4200 cm–1 Bandwidth


Following a recent string of advances, CRF researchers Alexis Bohlin and Christopher Kliewer have developed a new coherent Raman imaging spectrometer that acquires spectral information rendered in two spatial dimensions (2D) to generate a planar array of thousands of Coherent anti-Stokes Raman spectroscopy (CARS) spectra—all within the instantaneous timeframe of a single laser shot. In new work, the researchers extended their previously reported simplified two-beam CARS setup to simultaneously measure Raman transitions up to 4200 cm-1, allowing, in principle, detection of all Raman active vibrational or rotational manifold distributions for major flame species. This unique spatially correlated assessment method, incorporating all CARS benefits, enables new cutting-edge diagnostics for many fast, dynamical gas-phase systems.

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Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.