Low Cost Image Processing of Bunsen Flame Photography for Estimation of Flame Speeds

Souflas, Konstantinos; Psarakis, Emmanouil Ζ.; Koutmos, P.; Egolfopoulos, Fokion N.

doi:10.1080/00102202.2018.1512105

Cited by 9 publications

(10 citation statements)

References 34 publications

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“…The flame edges of the left or right half were detected (Figure e) and then fitted to a curve (Figure f) with MATLAB. Curve fitting was performed on the flame edge, and the resultant curve formula was integrated (eq ) to obtain A b . Here, α < x < β, f ( x ) is the fitted curve equation, and f 1 ( x ) is its first derivative. In the experiment, the left and right halves of the flame were processed separately to calculate S u 0 , and then the average value was calculated.…”

Section: Methodsmentioning

confidence: 99%

“…The conical flame is not a conical structure in a strict sense as a result of the bending of heat loss in the flame bottom and strong strain at the top. These factors results in that the error between experimental S u 0 and the real data may be up to 20% . In the definition of 1D flame, the area of unburned reactant is used to calculate S u 0 .…”

Section: Methodsmentioning

confidence: 99%

“…The flame edges of the left or right half were detected (Figure 2e) and then fitted to a curve (Figure 2f) with MATLAB. Curve fitting was performed on the flame edge, and the resultant curve formula was integrated (eq 6) 39 to obtain A b .…”

mentioning

confidence: 99%

“…These factors results in that the error between experimental S u 0 and the real data may be up to 20%. 39 In the definition of 1D flame, the area of unburned reactant is used to calculate S u 0 . However, Sun et al 40 found that S u 0 of the unburned region was affected by strain and bending simultaneously, while S u 0 of the burning region was only affected by strain.…”

mentioning

confidence: 99%

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Impact of Pyrolysis Products on n-Decane Laminar Flame Speeds Investigated through Experimentation and Kinetic Simulations

et al. 2021

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Jet fuels used in regenerative cooling are often pyrolyzed into gaseous and liquid products, which changes their burning properties. The effects of primary pyrolysis products, namely, hydrogen, methane, ethylene, and ethane, on the laminar flame speeds of n-decane/air were investigated at atmospheric pressure and 405 K using a Bunsen burner and chemical kinetics. The experimental results showed that methane inhibited the laminar flame speeds, whereas hydrogen, ethylene, and ethane promoted them. However, the laminar flame amplitude with ethane was about 40% of that with ethylene. Additionally, the enhanced flame speeds with ethylene and ethane were more evident under fuel-rich conditions than under fuel-deficient conditions. The effect of n-decane pyrolysis conversion on flame speeds can be approximated as the superposition of the separate effects of four gases within 26% conversion. Kinetic analyses indicated that laminar flame speeds are sensitive to the generation and consumption of H and OH, where the total molarity of these species determines the laminar flame speeds. The hydrogen absorption reactions of methane consumed large amounts of H and OH, and generated CH 3 enhanced this consumption. The addition of ethylene significantly increased the mole fraction of HCO, the main precursor of H generation, which then generated OH and HO 2 . C 2 H 5 generated by ethane produced H through a decomposition reaction, which was the major reason for the increase in laminar flame speeds of n-decane.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Impact of Pyrolysis Products on n-Decane Laminar Flame Speeds Investigated through Experimentation and Kinetic Simulations

et al. 2021

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“…Each fuel-air mixture sample was quantified, based on the following calibration procedure. Initially, for a Φ range from 0 to 2 with step 0.2, known amounts of mass fuel and air were inserted into the main duct, monitored via high total accuracy calibrated sonic nozzles (± 0.5%) and with digital pressure regulators (Omega® DPG2001B, ± 0.25%), as in [157].…”

Section: Isothermal Casesmentioning

confidence: 99%

Experimental investigation of isothermal and reacting flow characteristics downstream of axisymmetric bluff body stabilizers under stratified or fully premixed inlet mixture conditions

Paterakis¹,

Πατεράκης²

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The current work describes an experimental investigation of isothermal and turbulent reacting flow field characteristics downstream of axisymmetric bluff body stabilizers under a variety of inlet mixture conditions. Fully premixed and stratified flames established downstream of this double cavity premixer/burner configuration were measured and assessed under lean and ultra-lean operating conditions. The aim of this thesis was to further comprehend the impact of stratifying the inlet fuelair mixture on the reacting wake characteristics for a range of practical stabilizers under a variety of inlet fuel-air settings. In the first part of this thesis, the isothermal mean and turbulent flow features downstream of a variety of axisymmetric baffles was initially examined. The effect of different shapes, (cone or disk), blockage ratios, (0.23 and 0.48), and rim thicknesses of these baffles was assessed. The variations of the recirculation zones, back flow velocity magnitude, annular jet ejection angles, wake development, entrainment efficiency, as well as several turbulent flow features were obtained, evaluated and appraised. Next, a comparative examination of the counterpart turbulent cold fuel-air mixing performance and characteristics of stratified against fully-premixed operation was performed for a wide range of baffle geometries and inlet mixture conditions. Scalar mixing and entrainment properties were investigated at the exit plane, at the bluff body annular shear layer, at the reattachment region and along the developing wake were investigated. These isothermal studies provided the necessary background information for clarifying the combustion properties and interpreting the trends in the counterpart turbulent reacting fields. Subsequently, for selected bluff bodies, flame structures and behavior for operation with a variety of reacting conditions were demonstrated. The effect of inlet fuel-air mixture settings, fuel type and bluff body geometry on wake development, flame shape, anchoring and structure, temperatures and combustion efficiencies, over lean and close to blow-off conditions, was presented and analyzed. For the obtained measurements infrared radiation, particle image velocimetry, laser doppler velocimetry, chemiluminescence imaging set-ups, together with Fouriertransform infrared spectroscopy, thermocouples and global emission analyzer instrumentation was employed. This helped to delineate a number of factors that affectcold flow fuel-air mixing, flame anchoring topologies, wake structure development and overall burner performance. The presented data will also significantly assist the validation of computational methodologies for combusting flows and the development of turbulence-chemistry interaction models.

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Characterization of Engine Combustion Flames Using Inverse Abel Transform

Verma

Kaushal

2020

Lecture Notes in Mechanical Engineering

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Low Cost Image Processing of Bunsen Flame Photography for Estimation of Flame Speeds

Cited by 9 publications

References 34 publications

Impact of Pyrolysis Products on n-Decane Laminar Flame Speeds Investigated through Experimentation and Kinetic Simulations

Impact of Pyrolysis Products on n-Decane Laminar Flame Speeds Investigated through Experimentation and Kinetic Simulations

Experimental investigation of isothermal and reacting flow characteristics downstream of axisymmetric bluff body stabilizers under stratified or fully premixed inlet mixture conditions

Characterization of Engine Combustion Flames Using Inverse Abel Transform

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