TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Unsteady Flow Structures in Radial Swirler Fed Fuel Injectors

[+] Author and Article Information
Kris Midgley, Adrian Spencer, James J. McGuirk

Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leiceestershire LE11 3TU, UK

J. Eng. Gas Turbines Power 127(4), 755-764 (Mar 01, 2004) (10 pages) doi:10.1115/1.1925638 History: Received October 01, 2003; Revised March 01, 2004

Many fuel injector geometries proposed for lean-premixed combustion systems involve the use of radial swirlers. At the high swirl numbers needed for flame stabilization, several complex unsteady fluid mechanical phenomena such as vortex breakdown and recirculation zone precession are possible. If these unsteady aerodynamic features are strongly periodic, unwanted combustion induced oscillation may result. The present paper reports on an isothermal experimental study of a radial swirler fed fuel injector originally designed by Turbomeca, and examines the dynamical behavior of the unsteady aerodynamic flow structures observed. Particle Image Velocimetry (PIV) is used to capture the instantaneous appearance of vortex structures both internal to the fuel injector, and externally in the main flame-stabilizing recirculation zone. Multiple vortex structures are observed. Vector field analysis is used to identify specific flow structures and perform both standard and conditional time averaging to reveal the modal characteristics of the structures. This allows analysis of the origin of high turbulence regions in the flow and links between internal fuel injector vortex breakdown and external unsteady flow behavior. The data provide a challenging test case for Large Eddy Simulation methods being developed for combustion system simulation.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Experimental rig

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Figure 2

Fuel injector geometry

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Figure 3

Overall flow structure

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Figure 4

Axial mean velocity profiles

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Figure 5

Turbulence energy contours

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Figure 6

Axial rms profiles

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Figure 7

Radial rms profiles

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Figure 8

Tangential rms profiles

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Figure 9

Longitudinal length scale

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Figure 10

Transverse length scale

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Figure 11

Radial velocity field at x∕Ds=−0.53

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Figure 12

Radial velocity field at x∕Ds=−0.27

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Figure 13

Pdf of central, jet penetration distance

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Figure 14

Pdf of wall reattachment point

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Figure 15

Instantaneous vector map in the x–r plane

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Figure 16

Instantaneous vector map at x∕Ds=0.0

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Figure 17

Reynolds decomposition vector map at x∕Ds=0.0

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Figure 18

PSD of tangential velocity at point A

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Figure 19

Conditionally averaged velocity field at x∕Ds=0.0

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Figure 20

Conditionally averaged radial rms at x∕Ds=0.0

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Figure 21

Long time-averaged radial rms at x∕Ds=0.0




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