Rotational-Vibrational Raman Spectroscopy for Measurements of Thermochemistry in Non-isobaric Environments

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Title: Rotational-Vibrational Raman Spectroscopy for Measurements of Thermochemistry in Non-isobaric Environments
Author: Bayeh, Alexander C.
Abstract: The present work examines line measurements of pressure , temperature , and density in high speed , non -isobaric flows emanating from an underexpanded jet nozzle . Line images of rotational and vibrational Raman spectra are collected for a 8 -mm linear laser probe , and are combined onto the same EMCCD detector . Combining the two techniques allows for a single -shot measurement of major species , pressure , and temperature in a turbulent non -isobaric environment that is chemically reacting . Temperature measurements along the laser test section are extracted from the rotational Raman spectrum , whereas major species densities are measured by examining the intensities of their respective vibrational Raman lines . Pressure can be calculated using an equation of state , in every location along the linear laser probe . The technique feasibility is examined by performing measurements of pressure , temperature and density in a non -reacting underexpanded air jet where the chemical composition is constant and known . Future work will extend the technique to chemically reacting supersonic flows with unknown chemical composition .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2009 -08 -7168
Date: 2010-01-14

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Rotational-Vibrational Raman Spectroscopy for Measurements of Thermochemistry in Non-isobaric Environments. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2009 -08 -7168 .

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