Session: 04-10 Combustion V

Submission Number: 179086

Lean Blow Out Prediction for Gaseous and Liquid Fuels in a Non-Premixed Swirl Combustor 

Gas turbine combustor performance is defined by several different Figures of Merit (FOM). One important FOM is the Lean Blowout (LBO) behavior of the combustor. It defines the operating envelope of the engine. LBO is a transient phenomena that can be very sensitive to different parameters like operating conditions, combustor design features, fuel properties etc. Numerical prediction of lean flame blowout has always been a major modeling challenge. The objective of this work is to evaluate the predictive capability of a Large Eddy Simulation (LES) Flamelet Progress Variable (FPV) based approach for lean blowout prediction in a non-premixed swirl combustor, for both gaseous and liquid fuels. We use the Cambridge swirl burner to first validate the numerical model for three cases: a non-reacting flow, a gaseous methane flame, and a liquid Jet-A flame using Fidelity LES, a Graphical Processing Unit (GPU)-based LES solver. The LES-FPV solver combined with a stochastic approach for liquid spray modeling, is able to predict all three validation cases with reasonable accuracy. This is followed by the study of lean blow out dynamics for both gaseous methane and liquid Jet-A fuels. The LES-FPV model predicts the LBO point for gaseous methane within 30% and liquid Jet-A within 20% accuracy.

Presenting Author: Navin Mahto Argonne National Laboratory

Presenting Author Biography: Navin is a postdoctoral appointee at Argonne National Laboratory working on combustion and
spray modeling for gas turbine combustion.

Authors:

Navin Mahto Argonne National Laboratory
Debolina Dasgupta Argonne National Laboratory