In this article, we describe the use of proper orthogonal decomposition (POD) to investigate how the dominant wake structures of a bluff-body-stabilized turbulent premixed flame are affected by the heat released by the flame itself. The investigation uses a validated large eddy simulation (LES) to simulate the dynamics of the bluff-body's wake (Blanchard et al., 2014, “Simulating Bluff-Body Flameholders: On the Use of Proper Orthogonal Decomposition for Wake Dynamics Validation,” ASME J. Eng. Gas Turbines Power, 136(12), p. 122603; Blanchard et al., 2014, “Simulating Bluff-Body Flameholders: On the Use of Proper Orthogonal Decomposition for Combustion Dynamics Validation,” ASME J. Eng. Gas Turbines Power, 136(12), p. 121504). The numerical simulations allow the effect of heat release, shown as the ratio of the burned to unburned temperatures, to be varied independently from the Damköhler number. Five simulations are reported with varying fractions of the heat release ranging from 0% to 100% of the value of the baseline experiment. The results indicate similar trends reported qualitatively by others, but by using POD to isolate the dominant heat release modes of each simulation, the decomposed data can clearly show how the previously reported flow structures transition from asymmetric shedding in the case of zero heat-release to a much weaker, but fully symmetric shedding mode in the case of full heat release with a much more elongated and stable wake.
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December 2015
Research-Article
Temperature Ratio Effects on Bluff-Body Wake Dynamics Using Large Eddy Simulation and Proper Orthogonal Decomposition
Ryan Blanchard,
Ryan Blanchard
Virginia Polytechnic Institute
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: rpberlin@vt.edu
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: rpberlin@vt.edu
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Wing Ng,
Wing Ng
Virginia Polytechnic Institute
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: wng@vt.edu
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: wng@vt.edu
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Uri Vandsburger
Uri Vandsburger
Virginia Polytechnic Institute
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: uri@vt.edu
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: uri@vt.edu
Search for other works by this author on:
Ryan Blanchard
Virginia Polytechnic Institute
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: rpberlin@vt.edu
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: rpberlin@vt.edu
Wing Ng
Virginia Polytechnic Institute
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: wng@vt.edu
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: wng@vt.edu
Uri Vandsburger
Virginia Polytechnic Institute
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: uri@vt.edu
and State University,
100S Randolph Hall,
Blacksburg, VA 24061
e-mail: uri@vt.edu
1Corresponding author.
Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 11, 2014; final manuscript received November 23, 2014; published online June 2, 2015. Editor: David Wisler.
J. Eng. Gas Turbines Power. Dec 2015, 137(12): 122601 (10 pages)
Published Online: June 2, 2015
Article history
Received:
October 11, 2014
Revision Received:
November 23, 2014
Citation
Blanchard, R., Ng, W., and Vandsburger, U. (June 2, 2015). "Temperature Ratio Effects on Bluff-Body Wake Dynamics Using Large Eddy Simulation and Proper Orthogonal Decomposition." ASME. J. Eng. Gas Turbines Power. December 2015; 137(12): 122601. https://doi.org/10.1115/1.4030383
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