Low-order modeling of high-altitude relight of jet engine combustors

A physics-based, low-order ignition model is used to assess the performance of a kerosene-fueled gas-turbine combustor under high-altitude relight conditions. The in this study based on motion virtual flame particles and their extinction according Karlovitz number criterion, stochastic procedure account for effects spray polydispersity flame’s behavior. large droplets arising from poor fuel atomization at sub-idle conditions are then investigated context parameters combustor’s For that, Reynolds-averaged Navier-Stokes simulation cold flow was performed as an input model. Ignition possible with Sauter mean diameter (SMD) 50 μm, enhanced by increasing spark volume. Although doubling volume larger SMDs (75 100 μm) resulted suppression short-mode failure events, not achieved due reduction effective flammable combustor. Overall, lower probability obtained when using spray, which be expected additional detrimental associated atomisation high polydispersity.