Temperature field measurement of an array of laminar premixed slot flame Jets using Mach-Zehnder interferometry

Ashrafi, Z. Najafian; Ashjaee, Mehdi

doi:10.1016/j.optlaseng.2015.01.002

Cited by 9 publications

(14 citation statements)

References 49 publications

(49 reference statements)

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“…The relation between the phase difference and refractive index is expressed by eq . Considering the origin of the coordinate system on the symmetry line at the same height of the outlet of the nozzles, In eq , Δϕ states the phase difference, λ is the wavelength of the laser light, L is the length of the test section (which is equal to the length of the slot burners), n ∞ is refractive index of the ambient of the flame, and n is the refractive index of air, which varies by the changes in the location.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, by negligence of the variation of refractive index along the path of the bean, eq can be simplified to eq . Each dark and bright line (flame fringe) in the photograph has the same phase information. As a consequence, for each line, a non-negative integer number (fringe number, FN) is dedicated, as defined in eq . While the integer numbers represent the bright lines, the other numbers stand for the dark lines.…”

Section: Discussionmentioning

confidence: 99%

“…Using the MATLAB image processing program, the distribution of the fringe numbers is determined. On the other hand, the fringe number is in relation to the refraction index presented in eq The two-dimensional (2D) relation between the fringe number and local refractive index in the xy plane is expressed by eq …”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, the fringe number is in relation to the refraction index presented in eq The two-dimensional (2D) relation between the fringe number and local refractive index in the xy plane is expressed by eq The refractive index is a function of the temperature.…”

Section: Discussionmentioning

confidence: 99%

“… The refractive index is a function of the temperature. Therefore, by applying Gladstone–Dale approximations, the temperature field can be extracted by eq . This equation is valid for temperatures up to 6000 K …”

Section: Discussionmentioning

confidence: 99%

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Combustion of Syngas in Intersecting Burners Using the Interferometry Method

et al. 2017

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This paper presents the results of interferometry of flames and combustion properties by conducting extensive experimental measurements and numerical simulations of a syngas flame in an intersecting burner setup. The experiments were performed to analyze the effects of key parameters on the flame structure and the temperature field of the intersecting slot burners in a dual-flame syngas combustion setup using the Mach−Zehnder interferometry technique. The Reynolds number, equivalence ratio, intersecting angle of burners, and jet-to-jet spacing between the burners were studied and validated with an acceptable accuracy. It was shown that, although an increasing Reynolds number from 100 to 200 does not change the maximum flame temperature more than 125 K, it has a significant influence on the flame structure. In addition, the maximum temperature is directly related to the intersecting angle and has an inverse relation with the equivalence ratio and jet-to-jet spacing. The maximum temperature of 2211 K was observed for θ = 100°. Results from the numerical simulations confirmed the data obtained from the interferometry and showed that NO x formation increases as the maximum observed temperature increases.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%