Characterization of Lean, Turbulent Flames at Gas Turbine Operating Conditions Using Highspeed Laser-Diagnostic Techniques
Abstract
Highspeed laser imaging diagnostics have the potential to revolutionize our understanding of turbulent flame dynamics in gas turbine engines. Already, these diagnostics have proven invaluable in identifying and characterizing dynamic flow-flame interactions responsible for flame stabilization, thermo-acoustic pulsation, blow-out and flashback in atmospheric-pressure swirl flames. A number of major technical challenges, however, make the viability of applying such diagnostics at the extreme conditions found in a gas turbine engine questionable. The goal of the proposed work is to explore the viability of applying simultaneous, kHz-rate stereoscopic particle image velocimetry (stereo-PIV) and planar laser-induced fluorescence of hydroxyl (OH-PLIF) in a lean, turbulent swirl-stabilized flame at pressures ranging from 5 bars up to those found in a modern gas turbine combustor (30 bars). An additional goal of the project is to apply these diagnostics to study flow-flame interactions leading to combustion instability and thermo-acoustic pulsation in the DLR Dual-Swirl Burner at elevated pressure conditions. These measurements will serve as the basis for a standard test case for the validation of numerical simulations of swirl flames in this well-characterized flow geometry.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 23, 2016
- Source ID
- FA95501610044
Entities
People
- Isaac Boxx
Organizations
- Air Force Office of Scientific Research
- German Aerospace Center
- United States Air Force