Turbulent Mixing Processes in a Swirling-Multiple Jet Confined Crossflow Configuration

摘要

The aim of the present work is to provide global insight on the turbulent mixing processes typically occurring in a rectangular perspex mixing module simulating a sector of an annular RQL gas turbine combustor, through an experimental investigation of non reacting multiple jet mixing with a confined swirling crossflow. The RQL (Rich burn - quick Quench - Lean burn) staged combustion concept has been proposed as one of the candidate technologies towards reducing NOx emissions in gas turbine combustion systems. Mean and fluctuating momentum and scalar field distributions, mixing rate and standard deviation were determined in a number of different test cases obtained by parametric variation of flow and geometric configuration conditions. The results clearly indicate the sensitivity of the attained mixing quality on the particular flow arrangement, the momentum flux ratio and the effect of swirl induced in the primary zone.