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TECHNICAL PAPERS

Experimental and Numerical Investigation of a Swirl Stabilized Premixed Combustor Under Cold-Flow Conditions

[+] Author and Article Information
P. A. Strakey

 National Energy Technology Laboratory, 3610 Collins Ferry Road, P.O. Box 880, Morgantown, WV 26507peter.strakey@netl.doe.gov

M. J. Yip

 National Energy Technology Laboratory, 3610 Collins Ferry Road, P.O. Box 880, Morgantown, WV 26507

Full datasets can be obtained by contacting the author (peter.strakey@netl.doe.gov).

J. Fluids Eng 129(7), 942-953 (Jan 18, 2007) (12 pages) doi:10.1115/1.2743665 History: Received April 03, 2006; Revised January 18, 2007

Planar velocity measurements under cold-flow conditions in a swirl-stabilized dump combustor typical of land-based gas turbine combustors were carried out using two-dimensional particle image velocimetry (PIV). Axial, radial, and tangential velocity components were measured sequentially using two experimental configurations. Mean and root-mean-squared velocity components are presented along with instantaneous realizations of the flowfield. A numerical study of the flowfield using large-eddy simulation (LES) and Reynolds-averaged Navier-Stokes (RANS) techniques was conducted in an effort to help understand the complex hydrodynamics observed in the experiments. The agreement between the experimental data and LES simulation was good with both showing evidence of a precessing vortex core. The results of the RANS simulation were not as encouraging. The results provide a fundamental understanding of the complex flowfield associated with the relatively simple geometry and also serve as a baseline validation dataset for further numerical simulations of the current geometry. Validation of LES models in a highly swirled, nonreacting flowfield such as the work presented here is an essential step towards more accurate prediction in a reacting environment.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of the SimVal combustor with inset showing swirl plate

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Figure 2

Layout of the two-dimensional PIV system in the “horizontal” light-sheet configuration

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Figure 3

Raw scattered light image for flowrate of 0.137kg∕s

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Figure 8

(a)–(f) Instantaneous contour plots of tangential velocity with vectors overlaid from six realizations at an axial location of 3mm. PIV data at 0.137kg∕s flowrate. Centerbody and annulus are annotated by the concentric circles in the figures. Flow is counterclockwise.

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Figure 9

Power spectrum from hot-wire measurement at dump plane. Flowrate of 0.0137kg∕s.

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Figure 10

Dominant and secondary frequencies measured with the hot wire at the dump plane as a function of flowrate

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Figure 16

Time trace of axial and tangential velocity and pressure at a single point located midway in the annulus at the dump plane. LES simulation at 0.137kg∕s flowrate.

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Figure 17

Mean axial velocity component (a), mean tangential velocity (b), and rms fluctuating velocity (c) at an axial location of 3mm from the PIV data (symbols), LES simulation, and an unsteady RANS simulation. Centerbody and annulus are annotated on the bottom of the figures.

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Figure 6

Contour plots of mean tangential velocity at: 3mm(a), 13mm(b), and 43mm(c) axial locations with vectors overlaid. PIV data at 0.137kg∕s flowrate. Centerbody and annulus are annotated by the concentric circles in (a).

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Figure 7

Mean velocity components at: 3mm, (a), 13mm(b), and 43mm(c) axial locations. PIV data at 0.137kg∕s. Centerbody and annulus are annotated in (a).

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Figure 4

(a) Contour plot of mean axial velocity with vectors overlaid and (b) contour plot of rms fluctuating velocity with streamlines overlaid. PIV data at 0.137kg∕s flowrate. Centerbody and annulus are annotated on the bottom of the figure. Z=axial location from dump plane, X=radial distance from center.

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Figure 5

Instantaneous vector fields from five realizations (a)–(e), along with mean vector field averaged over 200 realizations (f). PIV data at 0.137kg∕s flowrate. Vectors colored by velocity magnitude. Centerbody and annulus are annotated on the bottom of the figure.

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Figure 11

Mean axial and tangential velocity normalized by bulk-flow velocity versus radial location at axial location of 3mm for flowrates of 0.0137kg∕s and 0.137kg∕s from PIV measurements

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Figure 12

Instantaneous snapshot of axial velocity field (a), and mean axial velocity field (b) with contour lines of zero axial velocity along cutting plane through center of combustor. LES simulation at 0.137kg∕s flowrate.

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Figure 13

Contour plots of mean axial velocity (a), and rms fluctuating axial velocity (b) along cutting plane through center of combustor. LES simulation at 0.137kg∕s flowrate with field of view equal to Fig. 4. Centerbody and annulus annotated on bottom of figures.

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Figure 14

Mean velocity components at: 3mm(a); 13mm(b); and 43mm(c) axial locations. PIV data (symbols) and LES simulation (lines) at 0.137kg∕s. Centerbody and annulus are annotated in (a).

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Figure 15

Sequence of instantaneous contour plots of tangential velocity at the dump plane showing one full revolution of the PVC. Plots (a)–(f) are at 300μs intervals. LES simulation at 0.137kg∕s flowrate. Flow is counterclockwise.

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