PIV measurement of flow characteristic in single-head combustor with triple-stage swirler

Abstract

The present study investigates the flow field characteristic in a single-head combustor with triple-stage swirled, using particle image velocimetry (PIV). With pure air inlet flow, detailed mean and RMS velocities, turbulent intensity, vortices, Reynolds shear stress are obtained at several longitudinal and cross sections downstream of the swirled in the single-head combustor at flow temperature 300K and inlet combustor pressure 0.49MPa, 0.98MPa. It is seen from the investigation results that strong aerodynamic interactions among different kinds of combustor Eigen structures are existed. Multiple vortices are observed, accompanied with relevant recirculation zones. The effect of swirled is strong, and there are big and regular vortices in the cross sections in the downstream of the swirled 50mm away. The jet effect of main combustion holes and dilution holes is obvious, and the penetration of the jet flows are clearly deep with distinct effect on the flow field structure. It is shown that there are big size recirculation zones in the combustor flow field with high levels of turbulence generated due to triple-stage swirled, main combustion holes and dilution holes of the single-head combustor. It is helpful for promoting rapid mixing and stabilizing flame combustion.