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Proceedings ArticleDOI

Soot Suppression in Laminar Jet Diffusion Flames by Shear

About: The article was published on 2018-01-08. It has received 1 citations till now. The article focuses on the topics: Laminar flow.
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Proceedings ArticleDOI
01 Jun 2018
TL;DR: In this article, the effect of acoustics or sound energy on partially premixed flames was investigated by the use of a butane as fuel, fitted with a nozzle that houses three arrays consisting of four holes each that are placed equidistant to each other for entraining air.
Abstract: Combustion in itself is a complex phenomenon that involves the interaction and interplay of multiple phenomena, the combined effect of which give rise to the common flame that we see and use in our daily life applications from cooking to propelling our vehicles to space. The least thing that goes unnoticed about these flames is the effect of the various phenomena from its surrounding environment that affects its behaviour and properties. These phenomena cause a variety of energy interactions that lead to various types of energy transformations which in turn affect the flame behaviour. This paper focuses on experimentally investigating the effect of one such phenomenon, which is the acoustics or sound energy on partially premixed flames. The subject in itself is extensively studied upon as thermo-acoustics globally, whereas the current work focuses on studying its effect on soot formation of partially premixed flames. The said effect is studied in this research work by the use of a butane as fuel, fitted with a nozzle that houses 3 arrays consisting of 4 holes each that are placed equidistant to each other for entraining air and the resulting flame is impinged with sound from two independent and similar sound sources that are placed equidistant from the centre of the nozzle. The entire process is systematically video graphed using a 60 fps regular CCD and analysed for variation in flame heights and flickering frequencies where the fuel mass flow rate is maintained constant and the configuration of entrainment holes and frequency of sound are varied, whilst maintaining constant ambient atmospheric conditions. The current work establishes significant outcomes on the effect of acoustics on soot formation; it is noteworthy that soot formation is the main cause of pollution and a major cause of inefficiency of current propulsion systems. This work is one of its kinds and its outcomes are widely applicable to commercial and domestic appliances that utilise combustion for energy generation or propulsion and help us understand them better, so that we can increase their efficiency and

Cites background from "Soot Suppression in Laminar Jet Dif..."

  • ...Soot suppression increased along with higher external shear for all the fuel flow rates [12]....

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References
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Journal ArticleDOI
TL;DR: In this paper, the effects of applied voltage, polarity, and spacing of electrodes on soot emissions were investigated experimentally, and the results showed that the shape of the flame changed remarkably with increasing applied voltage.

85 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of diluent flow on soot production in laminar ethylene diffusion flames has been studied by measurement of smoke points and of the rates at which soot leaves a smoking flame.

63 citations

Journal ArticleDOI
TL;DR: In this paper, the authors dealt with the variation of flame shape and soot emission for acetylene diffusion flame by applying electric field, and the efficiency of soot suppression exceeded 90% in a high-voltage region over 7 kV.

30 citations

Journal ArticleDOI
TL;DR: In this paper, surface temperature and volume fraction are measured in ethylene/air coflowing laminar diffusion flames at high pressures, diluted with one of four diluents (argon, helium, nitrogen, and carbon dioxide) using a two-color technique.
Abstract: Soot surface temperature and volume fraction are measured in ethylene/air coflowing laminar diffusion flames at high pressures, diluted with one of four diluents (argon, helium, nitrogen, and carbon dioxide) using a two-color technique. Both temperature and soot measurements presented are line-of-sight averages. The results aid in understanding the kinetic and thermodynamic behavior of the soot formation and oxidation chemistry with changes in diluents, ultimately leading to possible methods of reducing soot emission from practical combustion hardware. The diluted fuel and coflow exit velocities (top-hat profiles) were matched at all pressures to minimize shear effects. In addition to the velocity-matched flow rates, the mass fluxes were held constant for all pressures. Addition of a diluent has a pronounced effect on both the soot surface temperature and volume fraction, with the helium diluted flame yielding the maximum and carbon dioxide diluted flame yielding minimum soot surface temperature and volum...

22 citations