K. A. Vereschagin

Two wavelength-CARS thermometry of hydrogen

In this work, we present the results of two-wavelength (2λ)-CARS thermometry of hydrogen at temperatures from 300–1200 K. The choice of the pair of spectral lines for the 2λ-CARS thermometer with respect to optimal temperature sensitivity within a given temperature range was analysed. Software was developed to process the experimental data and calculate the temperature. In the experiments, temperature and density were measured in a heated cell using single-shot and averaged CARS intensities in the pure rotationalS branch. The accuracy achieved and its dependence on measured temperature values and on the number of averaged shots was analysed.

Temperature Field in a Cryogenic LOX/CH4 Spray Flame

To prepare for the application of CARS thermometry to LOX/methane spray ames CARS spectra have been recorded in a O2/CH4-burner at pressure up to 11 bar. Based on the experience obtained, potential probe molecules have been selected for the application of CARS to a LOX/CH4 spray ame. A CARS system allowing simultaneously the thermometry of the two probe molecules H2 and H2O was then used to map the temperature eld in a cryogenic rocket model combustor. The suitability of H 2-CARS thermometry in a LOX/CH4 ame is demonstrated and the results provide a quantitative data base for the validation of simulation tools.

CARS measurements of intra-mode V-V exchange rate constants of nitrogen

Abstract The intra-mode V-V exchange rate constant in nitrogen, which turned out to be equal to K1001= (1±0.4) × 10−13 cm3/s, has been measured using pulsed excitation in a discharge or biharmonic laser field followed by CARS probing of the excited gas.