Emission line broadening in combustion products. Static and dynamic studies of gas mixtures

Abstract
Because of the new restrictions on pollutant levels in industrial combustion processes, it is necessary to determine and monitor the concentration and temperature distributions of combustion products. Emission and absorption spectroscopy have been investigated for passive and non-intrusive measurements to provide information about species concentrations and gas temperatures under severe conditions (T > 2000 K). The physics governing radiation emission and propagation are directly influenced by gas species, composition and concentrations, hence a high degree of theoretical and experimental analysis of typical gas samples is required to elaborate emission models. This paper intends to study high pressure effects on H₂O line broadening. An experimental laboratory setup for high temperature and high pressure dynamic gas analysis is presented. The H₂O vapor is produced as a burnt gas from a combustion of a hydrogen-air mixture in an enclosure. Initial measurements were performed in the visible range, in the 0.8 µm band of water with a grating spectrometer and a CCD detector.