Identification of Molecular Bands in Plasma Radiation Spectra Inside a Low-Emission Combustion Chamber

Molecular bands OH (306.1 nm), CH (430.18 nm), H2O (714-980 nm), C-2 (515.55 nm), NH (336 nm), NO (358.26 nm) have been identified (the most intense edges are shown in parentheses) in the plasma radiation spectra inside the low-emission combustion chamber of a gas turbine engine. This allows the ratio of their intensities to be used for controlling the working parameters of the combustion chamber to reduce emissions of harmful substances regulated by ICAO standards. The spectra have been recorded using Kolibri-2 spectrometers in two versions: (I) working spectral range of 190-1100 nm (with a resolution of 1 nm) and (II) working spectral range of 190-360 nm (with a resolution 0.2 nm). The radiation input into the spectrometer has been performed using a fiber-optic cable and a collimator.