This paper describes the results of an experimental study to understand the influence of inlet flow disturbances on the dynamics of combustion process in bluff body stabilized diffusion flames of liquid petroleum gas and air. The results show the influence of weak disturbances created by the change in incoming pipe length on the amplitude of pressure oscillations and the phase angle between pressure and heat release. It is seen that the phase delay increases as the entry length increases. The rms value of pressure, however, generally falls with the increase in length. The phase angle is seen to be in the second quadrant, showing that the heat release oscillations damp the pressure oscillations. Therefore, the decrease in the phase angle results in the reduction in damping and hence an increase in pressure fluctuations. The dominant frequencies of combustion oscillations are found to be the low frequency oscillations, and the frequency of oscillations increases with a decrease in the inlet pipe length and an increase in the flow Reynolds number. It is suggested that such low frequency oscillations are driven by vortex shedding at the wake of the bluff body, which energizes the diffusion and mixing process.
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September 2009
Technical Briefs
Combustion Oscillations in Bluff Body Stabilized Diffusion Flames With Variable Length Inlet
M. Madanmohan,
M. Madanmohan
Department of Aerospace Engineering,
Indian Institute of Technology Kanpur
, Kanpur UP 208016, India
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S. Pandey,
S. Pandey
Department of Aerospace Engineering,
Indian Institute of Technology Kanpur
, Kanpur UP 208016, India
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A. Kushari,
A. Kushari
Department of Aerospace Engineering,
Indian Institute of Technology Kanpur
, Kanpur UP 208016, India
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K. Ramamurthi
K. Ramamurthi
Department of Mechanical Engineering,
Indian Institute of Technology Madras
, Chennai 600 036, India
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M. Madanmohan
Department of Aerospace Engineering,
Indian Institute of Technology Kanpur
, Kanpur UP 208016, India
S. Pandey
Department of Aerospace Engineering,
Indian Institute of Technology Kanpur
, Kanpur UP 208016, India
A. Kushari
Department of Aerospace Engineering,
Indian Institute of Technology Kanpur
, Kanpur UP 208016, India
K. Ramamurthi
Department of Mechanical Engineering,
Indian Institute of Technology Madras
, Chennai 600 036, India
J. Eng. Gas Turbines Power. Sep 2009, 131(5): 054501 (4 pages)
Published Online: May 22, 2009
Article history
Received:
June 7, 2008
Revised:
October 15, 2008
Published:
May 22, 2009
Citation
Madanmohan, M., Pandey, S., Kushari, A., and Ramamurthi, K. (May 22, 2009). "Combustion Oscillations in Bluff Body Stabilized Diffusion Flames With Variable Length Inlet." ASME. J. Eng. Gas Turbines Power. September 2009; 131(5): 054501. https://doi.org/10.1115/1.3078387
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