Study on Coaxial-Type Burner with Combustion Chamber. Flame Pattern and Its Stabilization.

An advanced method of flame stabilization by combining a recessed burner with a circular combustion chamber, is proposed. This type of combustor is expected to be effective for improving flame stabilization, if it is set in a part of turbulence region in a large-scale combustor. Nozzle diameter is kept constant, while inner diameters of combustion chambers are varied. Three kinds of combustors having area ratios of 3.2, 9.0 and 26.0 are used, where the area ratio is defined by d22/d21 (d1 ; the nozzle diameter, d2 ; the inner diameters of combustion chamber) . States of combustion are examined according to time-averaged combustion temperature profiles. As a result, it is found that the proposed combustor has an optimum area ratio of 9.0 among these scale of combustor.