Flame Instability in A Liquid Fuel Burner: Comparisons Between Single And Multipoint Injections

With the aim to characterize the flame behavior when ultra-lean combustion conditions are reached, an experimental investigation was performed on a liquidfuel gas turbine derived burner, at different fuel/air ratios and comparing different fuel injection modes. Ultra lean conditions have a negative impact on combustion efficiency for the instabilities insurgence. High speed acquisitions by a CCD camera were performed to investigate the behavior of the spray and the flame close to lean blowout. Statistical and spectral analyses were also applied to the flame acquisitions to extract suitable parameters for blowout recognition.