Abstract

This work presents an experimental study on non-premixed flame behavior under elevated pressure and temperature conditions. A novel experimental setup, The High Temperature and Pressure Duct, is operated to achieve simultaneous elevated pressure and temperature. The research covers laminar lifted flames, syngas jet flames, and cracked ammonia jet flames, offering insights into flame stabilization, structure, and emissions under industrially relevant conditions. For laminar-lifted flames, a new correlation is developed to predict lift-off given controllable operating parameters as well as a new theoretical approach for the prediction of Schmidt number. Nest, syngas jet flames were investigated through OH-PLIF with pressures up to 5 bar and preheat temperatures of 373K. The pressure was shown to reduce the flame length, increase OH layer corrugation, and reduce OH layer thickness while preheating similarly reduced flame length, however, the OH layer thickness was increased in all jet conditions. For cracked ammonia flames both OH and NO-PLIF were used to understand the interplay between these radicals at different cracking ratios, pressure, and preheat temperatures. The results show that as the cracking ratio is increased there is a shift between OH and NO peaks both experimentally and numerically indicating a transition from fuel to thermal NO production. This experimental setup and findings provide unique experimental data with simple boundary conditions that will aid combustion model development in the future.

Biography

Alfaisal Albalawi is currently a PhD Candidate in Mechanical Engineering at KAUST. He earned his Bachelor of Science in Mechanical Engineering from The University of Texas at Austin in 2018 and an MS in Mechanical Engineering from KAUST in 2019. His current research focuses on the investigation of novel fuels at industrially relevant conditions for use in power generation through advanced laser techniques.