Combustion Oscillation in a Staged LPP Combustor

Abstract : The presence of combustion oscillation caused by self amplification of the pressure and heat release fields, is very common within Lean Premixed Prevaporised (LPP) combustors. After suffering significant structural damage from oscillations of this type an axially staged combustor was subjected to a programme of diagnostic testing to establish a series of safe running conditions. Using fuel staging to vary the local air to fuel ratios (AFR), a series of conditions exhibiting much reduced levels of oscillation were identified.