Topic
Diffusion flame
About: Diffusion flame is a research topic. Over the lifetime, 9266 publications have been published within this topic receiving 233522 citations.
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TL;DR: The counterflow diffusion flame burner as mentioned in this paper is a tool for the study of the nucleation from the vapor phase of refractory compounds such as SiO2, Al2O3, and other metal oxides.
87 citations
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TL;DR: In this paper, a planar laser-induced fluorescence (PLIF) imaging of CH and OH radicals was used to investigate partially premixed turbulent jet flames, and the surface density of the studied flames was determined.
87 citations
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TL;DR: Results indicate that there is a region below the nozzle exit where significant amounts of oxygen are found on the fuel side of the peak flame temperature profile of a hydrogen-nitrogen jet diffusion flame.
Abstract: Dual-pump coherent anti-Stokes Raman scattering (CARS) has been demonstrated for the simultaneous measurement of gas-phase temperature and concentrations of molecular nitrogen and oxygen. A polarization technique was used to vary the relative intensities of the two CARS signals and expand the dynamic range of the relative concentration measurements. Detailed temperature and oxygen mole fraction measurements were performed in the stabilization region of a hydrogen-nitrogen jet diffusion flame. These results indicate that there is a region below the nozzle exit where significant amounts of oxygen are found on the fuel side of the peak flame temperature profile.
87 citations
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TL;DR: In this article, a multi-regime approach is applied to two laminar n-heptane flames in an effort to characterize the capabilities and limitations of the approach, and it is shown that even when the local combustion regime is correctly predicted, small deviations from an assumed flamelet manifold can lead to changes in the NO production rate.
87 citations
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01 Jan 2007TL;DR: In this article, the impact of variable cross-section area and flame-wall coupling on the flame transition between different regimes and the onset of flame instability was investigated experimentally and theoretically.
Abstract: Quasi-steady and unsteady propagations of methane and propane–air premixed flames in a mesoscale divergent channel were investigated experimentally and theoretically. The emphasis was the impact of variable cross-section area and the flame-wall coupling on the flame transition between different regimes and the onset of flame instability. Experimentally, for the first time, spinning flames were observed in mesoscale combustion for both lean and rich methane and propane–air mixtures in a broad range of equivalence ratios. The spinning flames rotated in either clockwise or counterclockwise direction with equal probability. The results showed that for a fixed equivalence ratio, there was a critical flow rate, above which flame starts to spin. The spin frequency was approximately proportional to the flame speed. It was also found that the spinning flame only occurred after the transition from fast flame regime to slow flame regime. The flame propagation speed and the effective Lewis number were obtained analytically. Experimental observation and theoretical analysis suggested that regardless of the magnitude of mixture Lewis numbers, the flame-wall coupling will significantly increase the effective Lewis number and lead to a new mechanism to promote the thermal diffusion instability.
87 citations