Venturi-cascading is a technique to control pollutant emissions from diffusion flames by modifying air infusion and fuel-air mixing rates through changing the flow dynamics in the combustion zone with a set of venturis surrounding the flame. A propane jet diffusion flame at a burner-exit Reynolds number of 5100 was examined with a set of venturis of specific sizes and spacing arrangement. The venturi-cascading technique resulted in a decrease of 33 percent in NO emission index along with a 24-percent decrease in soot emission from the flame, compared to the baseline condition (same flame without venturis). In order to understand the mechanism behind these results, laser-induced fluorescence (LIF) spectroscopy was employed to study the concentration field of the radicals (OH, CH, and CN) in the baseline and venturi-cascaded flames. The LIF measurements, in the near-burner region of the venturi-cascaded flame, indicated an average decrease of 18, 24 and 12 percent in the concentrations of OH, CH, and CN radicals, respectively, from their baseline values. However, in the midflame region, a 40-percent average increase in OH from its baseline value was observed. In this region, CH or CN radicals were not detected. The OH radical concentration in the downstream locations was mostly affected by soot rather than by temperature.
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June 2001
Technical Papers
Laser-Induced Fluorescence Measurements in Venturi-Cascaded Propane Gas Jet Flames
Ala R. Qubbaj, Mem. ASME,
Ala R. Qubbaj, Mem. ASME
Engineering Department, University of Texas-Pan American, Edinburg, TX 78539
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S. R. Gollahalli, Fellow ASME
S. R. Gollahalli, Fellow ASME
School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK 73019
11
Search for other works by this author on:
Ala R. Qubbaj, Mem. ASME
Engineering Department, University of Texas-Pan American, Edinburg, TX 78539
S. R. Gollahalli, Fellow ASME
11
School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK 73019
Contributed by the Petroleum Division and presented at the International Mechanical Engineering Congress and Exposition, the Winter Annual Meeting of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS, Nashville, Tennessee, November 14–19, 1999. Manuscript received by the Petroleum Division, August 12, 1999; revised manuscript received November 10, 2000. Associate Editor: S. Acharya.
J. Energy Resour. Technol. Jun 2001, 123(2): 158-166 (9 pages)
Published Online: November 10, 2000
Article history
Received:
August 12, 1999
Revised:
November 10, 2000
Citation
Qubbaj, A. R., and Gollahalli, S. R. (November 10, 2000). "Laser-Induced Fluorescence Measurements in Venturi-Cascaded Propane Gas Jet Flames ." ASME. J. Energy Resour. Technol. June 2001; 123(2): 158–166. https://doi.org/10.1115/1.1368120
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