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Technical Briefs

Technical Brief: Predictions of Flow Field for Circular-Disk Bluff-Body Stabilized Flame Investigated by Large Eddy Simulation and Experiments

[+] Author and Article Information
Peiqing Guo

School of Mechanical Engineering, Shanghai Jiaotong University, No. 800, Dongchuan Road, Shanghai 200240, Chinahopeisendless@hotmail.com

Shusheng Zang, Bing Ge

School of Mechanical Engineering, Shanghai Jiaotong University, No. 800, Dongchuan Road, Shanghai 200240, China

J. Eng. Gas Turbines Power 132(5), 054503 (Mar 04, 2010) (6 pages) doi:10.1115/1.3205029 History: Received April 08, 2009; Revised April 28, 2009; Published March 04, 2010; Online March 04, 2010

The objective of the current work is to shed light on simulating the flow features of nonpremixed flame stabilized by a circular-disk bluff-body with large eddy simulation technique. Two subgrid scale (SGS) models (Smagorinsky and Germano), combined with a constrained chemical equilibrium model, are applied to simulate this turbulent flame. Validation is made through the particle image velocimetry measurements. The comparison between the numerical simulation and experimental data shows that both models perform well and reproduce most of the significant features of the bluff-body flame, while the Germano SGS model performs better in prediction of turbulent fluctuations. These investigations show that it is possible to describe such flows with relatively simple turbulence and combustion models with moderate grids.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Circular-disk bluff-body with all dimensions and coordinate system

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Figure 2

Streamlines plots of time-averaged velocities for circular-disk bluff-body

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Figure 3

(a) Mean axial and (b) radial velocity profiles

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Figure 4

(a) Axial and (b) radial velocity fluctuations

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Figure 5

Instantaneous vorticity distribution: (a) Smagorinsky and (b) Germano; recirculation zone is denoted by white line

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Figure 6

(a) Instantaneous density and (b) temperature fields under nonpremixed combustion

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