Abstract
Over the past two decades, Raman scattering has been developed as a uniquely useful tool in combustion and gasdynamic research. For flows that are not prohibitively luminous or particle-laden, it can provide composition and temperature data in real time. It has the capability to view physical situations in a “snapshot” fashion—as in single-shot data accumulation to build histograms that can approach probability density functions, or in the direct acquisition of linear or two-dimensional Raman images—and possesses the capability to observe the difference between thermodynamic equilibrium and molecular internal mode populations that are out of equilibrium. Here, we illustrate its applicability to experimental problems for which mean flame structural data are desired. We show here results on the use of pointwise Raman data to give average spatial maps for zones of a turbulent diffusion flame.
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