Coherent Anti-Stokes Raman Spectroscopy measurements of temperature fluctuations in turbulent natural gas-fueled piloted jet diffusion flames

Computations using the joint velocity-scalar probability density function (pdf) method as well as benchmark quality experimental data for swirling and nonswirling hydrogen jet diffusion flames are reported. Previous studies of diffusion flames reported in the literature have been limited to nonswirling flames and have had no detailed velocity data reported in the developing (near-nozzle) region of the flames. The measurements and computations reported herein include velocities (mean and higher moments up to fourth order) and temperature (mean and variance) near the burner exit and downstream locations up to 26.5 jet diameters. The velocities were measured with a three-component laser-Doppler velocimeter (LDV) and the temperature was measured using coherent anti-Stokes Raman spectroscopy (CARS). The joint pdf method offers significant advantages over conventional methods for computing turbulent reacting flow, and the computed results are in good agreement with data. This study serves to present data that can be used for model validation as well as to validate further the joint pdf method.

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An Experimental and Computational Study of Swirling Hydrogen Jet Diffusion Flames

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations ◽

10.1115/95-gt-307 ◽

1995 ◽

Author(s):

M. S. Anand ◽

F. Takahashi ◽

M. D. Vangsness ◽

M. D. Durbin ◽

W. J. Schmoll

Keyword(s):

Diffusion Flames ◽

Computational Study ◽

Laser Doppler Velocimeter ◽

Reacting Flow ◽

Jet Diffusion Flames ◽

Burner Exit ◽

Mean And Variance ◽

Joint Velocity ◽

Anti Stokes ◽

Good Agreement

Computations using the joint velocity-scalar probability density function (pdf) method as well as benchmark quality experimental data for swirling and nonswirling hydrogen jet diffusion flames are reported. Previous studies of diffusion flames reported in literature have been limited to nonswirling flames and have had no detailed velocity data reported in the developing (near-nozzle) region of the flames. The measurements and computations reported herein include velocities (mean and higher moments up to fourth order) and temperature (mean and variance) near the burner exit and downstream locations up to 26.5 jet diameters. The velocities were measured with a three-component laser Doppler velocimeter (LDV) and the temperature was measured using coherent anti-Stokes Raman spectroscopy (CARS). The joint pdf method offers significant advantages over conventional methods for computing turbulent reacting flow, and the computed results are in good agreement with data. This study serves to present data that can be used for model validation as well as to further validate the joint pdf method.

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Structure of Turbulent Hydrogen Jet Diffusion Flames With or Without Swirl

Journal of Heat Transfer ◽

10.1115/1.2822583 ◽

1996 ◽

Vol 118 (4) ◽

pp. 877-884 ◽

Cited By ~ 8

Author(s):

F. Takahashi ◽

M. D. Vangsness ◽

M. D. Durbin ◽

W. J. Schmoll

Keyword(s):

Turbulent Combustion ◽

Laser Doppler Velocimetry ◽

Diffusion Flames ◽

Near Field ◽

Turbulent Flame ◽

Flame Zone ◽

Jet Diffusion Flames ◽

Air Jet ◽

The Mean ◽

Anti Stokes

The near-field turbulent structure of double-concentric hydrogen-air jet diffusion flames, with or without swirl, has been investigated using conditionally sampled, three-component laser-Doppler velocimetry and coherent anti-Stokes Raman spectroscopy. The turbulent flame zone became thinner and shifted inward as the mean jet velocity was increased, whereas swirl created a radial velocity even at the jet-exit plane, thereby broadening and shifting the flame zone outward. The probability-density functions of velocity components, their 21 moments (up to fourth order), mean temperature, and root-mean-square temperature fluctuation were determined in the near field. The data can be used to validate advanced turbulent combustion models.

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