Experimental and computational infrared imaging of bluff body stabilized laminar diffusion flames

Rankin, Brent A.; Blunck, David L.; Katta, Viswanath R.; Stouffer, Scott D.; Gore, Jay P.

doi:10.1016/j.combustflame.2012.03.022

Cited by 12 publications

(6 citation statements)

References 8 publications

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“…Including the effects of buoyancy improves the agreement further but only at locations downstream of the stoichiometric flame length. For comparison purposes, it is noted that the differences between the measured and computed radiation intensities for the turbulent diffusion flame (35-45%) considered in the present work are larger than those observed for bluff-body stabilized laminar diffusion flames (15-30%) studied in past work[17]. Both the present and past[17] studies utilized similar experimental methods with identical calibration processes and similar model-based mid-infrared imaging approaches with identical narrowband radiation models.…”

mentioning

confidence: 68%

“…These studies demonstrated that the qualitative comparison of measured and computed planar results is a useful tool for assessing soot formation models in luminous regions of laminar flames. The quantitative comparison of measured and computed images of the radiation intensity from bluff-body stabilized laminar diffusion flames revealed good agreement in the size and shape of the flames and important differences in the flame stabilization region, suggesting improvements in the modeling of soot formation and heat losses [17].…”

mentioning

confidence: 95%

“…The opportunities are supported partially by emerging imaging technologies (e.g. calibrated high-speed imaging of mid-infrared radiation [17][18][19][20]) and advanced simulation capabilities (e.g. LES and direct numerical simulations).…”

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confidence: 99%

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Quantitative model-based imaging of mid-infrared radiation from a turbulent nonpremixed jet flame and plume

Rankin

Ihme

Gore

2015

Combustion and Flame

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Current understanding of turbulent reacting flows can be improved by novel quantitative comparisons using highly scalable visualization methods based on volume rendering of timedependent mid-infrared intensities in the form of images with multiple view angles. In this work, the effects of radiation and buoyancy in a turbulent nonpremixed flame and plume are studied by quantitatively comparing measured and computed images of the mid-infrared radiation intensity. To this end, a turbulent nonpremixed jet flame (Reynolds number 15,200 and CH 4 /H 2 /N 2 fuel composition) is considered, representing a benchmark flame configuration of the International Workshop on Measurement and Computation of Turbulent Nonpremixed Flames (TNF Workshop). Quantitative images of the radiation intensity from the flame are acquired using a calibrated high-speed mid-infrared camera and band-pass filters. The camera and filters enable time-dependent measurements of radiation from water vapor and carbon dioxide over the entire flame length and beyond. Results of the solution to the radiative transfer equation are

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confidence: 68%

mentioning

confidence: 95%

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Quantitative model-based imaging of mid-infrared radiation from a turbulent nonpremixed jet flame and plume

Rankin

Ihme

Gore

2015

Combustion and Flame

Self Cite

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“…In the measured images, this anchor was missing. This discrepancy points to a challenge in the lowsooting regions of the flame that are difficult to capture by a camera due to emission beyond the visible range (Rankin, Blunck, & Katta, 2012). This finding about anchoring or lifting from the burner outlet presents a challenge to consider when comparing camera imaging to radiative measurements, and is introduced in the results of the current study as well.…”

Section: ̇⁄mentioning

confidence: 85%

A method for measurement of spatially resolved radiation intensity and radiative fraction of laminar flames of gaseous and solid fuels

Hamel

Raffan-Montoya

Stoliarov

2019

Experimental Thermal and Fluid Science

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This work introduces a new method for determination of the radiative fraction for axisymmetric laminar flames for both gaseous and solid fuels by using a DSL-R camera and a Schmidt-Boelter heat flux gauge. The high spatial resolution provided by the images of the camera allow for a multi-emitter treatment of the 2-6 cm flames. The flame's radius and intensity are extracted from the images and presented as two curves that are functions of the flame-axis position. Each point on the flame sheet is discretized at pixel-level resolution and treated as a differential emitting surface. Radiation transport equations are formulated and solved numerically to compute a function that relates the camera's readings to the total thermal radiation intensity detected by the gauge. The calculation yields spatially resolved radiation intensity information. Integration of this intensity over the flame surface divided by the total heat release rate yields the global radiative fraction.

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“…Thus, it is possible to measure the thermal emissions of species such as CO 2 and H 2 O that emit in this spectrum in environments that prohibit the use of other optical diagnostics. Infrared emissions from ambient pressure flames have been compared to computational models [17]. Significant uncertainty exists, however, as to the utility of infrared emission measurements in liquid fueled environments at rocket operating pressures.…”

Section: G1mentioning

confidence: 99%

Optical Diagnostics in a High-Pressure Combustor with Gaseous Oxygen and Kerosene

Balance

Bibik

Cook

et al. 2019

Journal of Propulsion and Power

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Experimental and computational infrared imaging of bluff body stabilized laminar diffusion flames

Cited by 12 publications

References 8 publications

Quantitative model-based imaging of mid-infrared radiation from a turbulent nonpremixed jet flame and plume

Quantitative model-based imaging of mid-infrared radiation from a turbulent nonpremixed jet flame and plume

A method for measurement of spatially resolved radiation intensity and radiative fraction of laminar flames of gaseous and solid fuels

Optical Diagnostics in a High-Pressure Combustor with Gaseous Oxygen and Kerosene

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