59306 - High Speed Oh Plif Measurements of Combustor Effusion Films in a High Pressure, Liquid Fueled Combustor 

This paper presents measurements of 10 kHz OH planar laser induced fluorescence (PLIF) in a gas turbine combustor rig. The objective of the measurements is to study the interaction of effusion cooling with the flame and hot combustion products. The combustor rig is a single sector representation a rich-burn/quick-quench/lean-burn (RQL) configuration. It consists of a swirl nozzle, quench jets, and a modular liner that could be fitted with various effusion cooling panels and optical access windows. The rig is operated under realistic conditions, including elevated combustor inlet temperature, elevated pressure, liquid fuel, several different primary equivalence ratios, and combustion. The PLIF laser sheet was arranged perpendicular to the liner at several different locations. Some measurement planes are threaded in-between the effusion holes, and others intersect the effusion holes. The PLIF images provide a visualization of the interaction between the effusion air and the flame or hot combustion products. Parametric variations of important parameters, namely primary equivalence ratio, and effusion cooling air blowing ratio are conducted to investigate their effect on flame-effusion jet interactions. The PLIF images were analyzed using several data reduction techniques to de-noise the images and identify patterns in the effusion jet-flame interactions. Results show that the effusion jets are highly unsteady, interacting strongly with the turbulent flame from the swirl nozzle and the dilution jets. Additionally, the PLIF data is supplemented with cold side wall temperatures of the effusion panel measured using a short wave infrared thermal camera. This work is an extension of recent effusion film mixing studies that were performed with acetone PLIF under non-reacting conditions.