Rotational CARS for simultaneous measurementsof temperature and concentrations of N2, O2, CO,and CO2 demonstrated in a CO/air diffusion flame

摘要

Rotational coherent anti-Stokes Raman spectroscopy (CARS) has over the years demonstrated itsstrong potential to measure temperature and relative concentrations of major species in combustion. Arecent work is the development and experimental validation of a CO2 model for thermometry, in additionto our previous rotational CARS models for other molecules. In the present work, additional calibrationmeasurements for relative CO2/N2 concentrations have been made in the temperature range 294–1246 K instandardized CO2/N2 mixtures. Following these calibration measurements, rotational CARS measurementswere performed in a laminar CO/air diffusion flame stabilized on a Wolfhard–Parker burner.High-quality spectra were recorded from the fuel-rich region to the surrounding hot air in a lateral crosssection of the flame. The spectra were evaluated to obtain simultaneous profiles of temperature and concentrationsof all major species; N2, O2, CO, and CO2. The potential for rotational CARS as a multi-speciesdetection technique is discussed in relation to corresponding strategies for vibrational CARS.