Effects of heating height on flame appearance, temperature field and efficiency of an impinging laminar jet flame used in domestic gas stoves

Adding tubes on the bottom of delayed coking furnace is an useful measure for enhancing the throughput, but the distance between tubes and burners is too small to conform design standard. The security of these bottom tubes is uncertain. The processes of turbulence, combustion and heat transfer in the furnace were simulated by numerical method. Detailed information of velocity field, temperature field and heat flux was obtained. The heat transfer of tubes in entrainment zone of jet flame was investigated. The possibility of tube oxidation and hot spot was also discussed. Results show that the bottom tubes are security, which located in the low temperature field and the range of heat flux is 22~45 kW/m2. The results are in good agreement with industrial testing data.

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Visualization of lifted laminar jet flame by rayleigh scattering, OH PLIF, and CH chemiluminescence

Journal of Visualization ◽

10.1007/bf03181460 ◽

2003 ◽

Vol 6 (3) ◽

pp. 211-211 ◽

Cited By ~ 1

Author(s):

S. H. Won ◽

J. S. Lee ◽

S. H. Jin ◽

S. H. Chung

Keyword(s):

Rayleigh Scattering ◽

Jet Flame ◽

Laminar Jet

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Optical diagnostics of hydrogen-air diffusion flame

Journal of Physics Conference Series ◽

10.1088/1742-6596/2127/1/012017 ◽

2021 ◽

Vol 2127 (1) ◽

pp. 012017

Author(s):

V A Arbuzov ◽

E V Arbuzov ◽

Yu N Dubnishchev ◽

O S Zolotukhina ◽

V V Lukashov

Keyword(s):

Diffusion Flame ◽

Work Motivation ◽

Information Source ◽

Reference Points ◽

Diagnostic Methods ◽

Temperature Fields ◽

Jet Flame ◽

Laminar Jet ◽

Multi Wavelength ◽

Diagnostic Complex

Abstract Work motivation – adaptation of optical Hilbert diagnostic methods for visualization and study of optical density and phase temperature fields in the structure of an axisymmetric diffusion hydrogen-air flame. The diagnostic complex is implemented on the basis of the IAB-451 device with modified blocks of optical filtering, information source and processing. A laminar jet flame H2/N2 in still air is considered. The investigated torch is oriented vertically. Visualization of phase disturbances induced by the medium under study in a multi-wavelength probing (λ1 = 636 nm, λ2 = 537 nm and λ3 = 466 nm) light field is performed using polychromatic Hilbert and Foucault-Hilbert transformations in combination with registration and pixel-by-pixel processing of the dynamic RGB image structure. The dynamic phase structure of the diffusion flame is visualized. The initial temperature approximation, based on the assumption of an air mixture, is corrected so that the calculated hilbertogram matches the measured one as closely as possible. The data obtained are in good agreement with the results of thermocouple measurements. The temperature was recorded by thermocouples at reference points. The phase function is reconstructed in axisymmetric sections from RGB-hilbertograms. The reliability of the results is confirmed by comparing the experimentally obtained hilbertograms and hilbertograms reconstructed from phase structures using the Abel transform.

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