Simulation and PLIF experiment study of combustion flowfield for GH₂-GO₂ shear coaxial injector

In order to study the flame structure of gas-gas combustion and the practicability of the simulation method, RANS was applied to get the temperature, OH distribution and the characteristics of flow field. In addition, planar laser induced hydroxyl fluorescence (OH-PLIF) technology has been used to image the flame utilizing gas hydrogen/gas oxygen shear coaxial injector in a transparent combustion chamber. The results show that a large recirculation zone and a stable combustion shear layer are established in the front of the chamber. The shear stress, together with the influence of recirculation, shapes a OH peak, and its size and position were measured. With the development of turbulent vortex, folds occur and the combustion are enhanced. The comparison of the results of experiment and simulation shows that there are deviations of 0.6mm in the position of combustion shear layer and 2 mm in the axial position of OH peak. While the radial positions of OH peak are both 7 mm. The simulation results are in good accordance with the measurements although they moderately overpredict the positions of combustion shear layer and OH peak. It is concluded that the computational model can be used to predict the experiment conditions.