Analysis of Flow Field and Spray Characteristics of a Lean Premixed Injector in Low Emission Combustor of Industrial Gas Turbine

Abstract

A lean premixed injector designed by the authors provides a solution for achieving the goal of high efficiency and super low emission combustion in industrial gas turbine. The present work lays out a series of injector structures to investigate their flow and atomization characteristics. To facilitate the analysis, laser measurement technologies such as Particle Image Velocimetry (PIV) and Particle Dynamics Analyzer (PDA) are applied to experiments. A typical and reasonable flow field is revealed since Primary Recirculation Zone (PRZ) and Corner Recirculation Zone (CRZ) are clearly observedin PIV experiment results. The angle of main swirl blades is main parameter to affect flow field, in which the swirl angle, axial velocity, radial velocity, location of PRZ all will change. Atomization test shows that Sauter Mean Diameter (SMD) of kerosene droplets is less than 40μm in downstream cross section 10mm away from lip. Unique aspects of this study play a pivotal role of application before this injector is installed in low emission combustor. of industrial gas turbine.