Application of simultaneous measurement of laser tomography and flame luminescence to a premixed-spray flame

Tsushima, Shoji; Saito, Hiroyasu; Akamatsu, Fumiteru; Katsuki, Masashi

doi:10.2514/6.1998-721

Cited by 1 publication

(5 citation statements)

References 8 publications

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“…The detection of chemiluminescence has often been used in previous research to describe various aspects of the combustion process qualitatively. [21][22][23][24][25] The chemiluminescence intensities are roughly proportional to the reaction intensity. The OH chemiluminescence is free from background luminosity because it relaxes to the ground state in the UV range, with the most intense bands being the (0,0) at 306.4 nm and the (1,0) at 281.l nm.…”

Section: Methodsmentioning

confidence: 99%

“…The OH chemiluminescence is free from background luminosity because it relaxes to the ground state in the UV range, with the most intense bands being the (0,0) at 306.4 nm and the (1,0) at 281.l nm. 22,23 Therefore, the OH chemiluminescence can be properly used as a marker for deciding the flame-tip behavior. However, as stated in the Introduction, it is impossible to get quantitative information on the concentration of OH in the present study.…”

Section: Methodsmentioning

confidence: 99%

“…However, the spontaneous emission of OH is free from background luminosity because, as stated earlier, it is located in the UV range. 22,23 It can be properly used as a reaction zone marker for deciding the flame tip behavior, because it clearly ceases outside the reaction zone. Therefore, we have applied a method that relies on the spontaneous emission of OH.…”

Section: Flame Characteristicsmentioning

confidence: 99%

“…Among those methods, the detection of chemiluminescence has been widely used by previous researchers to describe various aspects of the combustion process qualitatively. [21][22][23][24][25] Chemiluminescence intensities are roughly proportional to the reaction intensity.…”

Section: Introductionmentioning

confidence: 99%

“…OH chemiluminescence is free from background luminosity, because it is located in the ultraviolet (UV) range. 22,23 Therefore, the OH chemiluminescence can be properly used as a marker for deciding the flame length behavior. However, note that obtaining quantitative information on the concentration of OH in the present study is impossible.…”

Section: Introductionmentioning

confidence: 99%

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Generation of Silica Nanoparticles in Turbulent Non-premixed Flames with Oxygen Enrichment

Bae¹,

Shin²

2009

Energy Fuels

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Silica nanoparticles were made via the gas-to-particle conversion of tetraethylorthosilicate (TEOS) in co-flowing turbulent methane-oxygen-enriched non-premixed flames. The effects of fuel velocity, oxygen concentration, flame residence time, and temperature distribution on the characteristics of the silica nanoparticles were investigated. The flame length was measured by OH chemiluminescence, using an intensified charge-coupled device (ICCD) camera. The primary particle diameter of the silica nanoparticles was quantitatively measured by transmission electron microscopy (TEM). Particle number concentration, as well as the geometric mean diameter and standard deviation, were measured by a scanning mobility particle sizer (SMPS) spectrometer. Adiabatic temperatures according to oxygen concentration and mixture fraction were calculated from thermodynamic equilibrium calculations, considering chemical species using CHEMKIN EQUIL code. Flame temperature, velocity, and turbulent intensity distributions were calculated using Fluent software adapted to the presumed probability density function (PDF) model, considering chemical species in the turbulent non-premixed methane-oxygen-enriched flame burner without including the particles. For each oxygen concentration condition, the flame residence time, average primary particle diameter, and geometric mean diameter decreased as the fuel velocity increased. Typically, agglomerates of silica nanoparticles were made on averaged primary particle diameters of 9-15 nm and geometric mean diameters of 60-100 nm, according to the oxygen concentration, which varied from 50% to 100% for first jet velocities of 40 and 70 m/s.

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