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research-article

IMPACT OF PVC DYNAMICS ON SHEAR LAYER RESPONSE IN A SWIRLING JET

[+] Author and Article Information
Mark Frederick

The Pennsylvania State University, University Park, PA, USA
mdf5282@psu.edu

Kiran Manoharan

Indian Institute of Science, Bangalore, India
kiranm@aero.iisc.ernet.in

Joshua Dudash

The Pennsylvania State University, University Park, PA, USA
joshuadudash94@gmail.com

Brian Brubaker

Texas A&M University, College Station, TX, USA
brianbrubaker@email.tamu.edu

Santosh Hemchandra

Indian Institute of Science, Bangalore, India
hsantosh@aero.iisc.ernet.in

Jacqueline O'Connor

The Pennsylvania State University, University Park, PA, USA
jxo22@engr.psu.edu

1Corresponding author.

ASME doi:10.1115/1.4038324 History: Received August 02, 2017; Revised August 22, 2017

Abstract

Combustion instability is a significant issue in the operation of gas turbine combustors. Shear layer roll-up, in particular, has been shown to drive longitudinal combustion instability in both laboratory and industrial combustors. One method for suppressing combustion instability would be to suppress the receptivity of the shear layer to acoustic oscillations, severing the coupling mechanism between the acoustics and the flame. Previous work suggested that the existence of a precessing vortex core (PVC) may suppress the receptivity of the shear layer, and the goal of this study is to first, confirm that this suppression is occurring, and second, understand the mechanism by which the PVC suppresses the shear layer receptivity. We couple experiment with linear stability analysis to determine whether a PVC can suppress shear layer receptivity to longitudinal acoustic modes in a non-reacting swirling flow at a range of swirl numbers. The shear layer response to the longitudinal acoustic forcing manifests as an m=0 mode. The PVC has been shown both in experiment and linear stability analysis to have m=1 and m=-1 modal content. By comparing the relative magnitude of the m=0 and m=-1,1 modes, we quantify the impact that the PVC has on the shear layer response. The mechanism for shear layer response is determined using forced response analysis, where the shear layer disturbance growth rates mirror the experimental results. Differences in shear layer thickness and azimuthal velocity profiles drive the suppression of the shear layer receptivity to acoustic forcing.

Copyright (c) 2017 by ASME
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