MIXING OF LARGE-VOLUME GAS-FLOWS IN PIPES AND DUCTS - VISUALIZATION OF CONCENTRATION PROFILES

Concentration profiles are measured during the mixing process of carbo n dioxide and air, which were injected into the rectangular cross sect ion of a duct. The volume flow rates of both components differ conside rably. The non-stationary and three-dimensional concentration fields a re measured by optical tomography using holographic interferometry as the measuring principle. Projection data from four different viewing a ngles are used for tomographic reconstruction by the ART method. Press ure losses due to mixing processes are also measured. Results are pres ented for different angles of injection and different ratios of moment um flow rate for single and multiple jets of carbon dioxide which were injected into the carrier gas stream of air.