Development and Application of Pure Rotational CARS for Reactive Flows

摘要: The thesis deals with the further development of pure rotational coherent anti-Stokes Raman spectroscopy (RCARS) for improving capabilities gas phase thermometry. main effort has been to make technique more robust when employed under a wide range temperatures and operational conditions. A primary aim investigate impact collisional broadening on N2 RCARS thermometry, especially in an environment which is perturbed by H2. Since interaction this sort species-specific temperature-dependent, it plays very critical role It was found that sequence implementation, validation application, thermometric accuracy could be improved implementation N2-H2 line-broadening coefficients. Investigation these topics involved exploring novel time-resolved picosecond direct measurements S-branch N2-N2/N2-H2 linewidths. The O2 Herman-Wallis factors, used quantify vibration-rotation breakdown rigid rotor model were also investigated. This correction affects line-intensities, Conclusions regarding sensitivity related factor achieved employing different expressions available specialized literature. A theoretical code N2O concerned set temperature-calibrated cell experiments developed validated. work expands list molecules previously developed, points interesting possibilities such as precision. The applied flame diagnostics. Temperatures mapped along centerline one-dimensional provided McKenna burner, serving important input data other optical techniques. homogeneity investigated two shielding co-flows, those air. Measurements performed low-swirl turbulent premixed flame, validating existing models large eddy simulations. Probability density functions (300 K 1700 K) relative concentrations provided. simultaneous quantities better understanding than possessed earlier air entrainment from surroundings.