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Research Papers: Fuel Combustion

Theoretical Investigation of Particle Behavior on Flame Propagation in Lycopodium Dust Cloud

[+] Author and Article Information
Alireza Rahbari

Department of Mechanical Engineering,
Shahid Rajaee Teacher Training
University (SRTTU),
Tehran 1678815811, Iran;
Research School of Engineering,
The Australian National University,
Canberra, ACT 2601, Australia
e-mails: ar.rahbari@gmail.com;
alireza.rahbari@anu.edu.au

Kau-Fui Wong

Life Fellow ASME
Department of Mechanical and
Aerospace Engineering,
University of Miami,
Coral Gables, FL 33146
e-mail: kwong@miami.edu

Moslem Akbari Vakilabadi

Combustion Research Laboratory,
Department of Energy Conversion,
School of Mechanical Engineering,
Iran University of Science and
Technology (IUST),
Tehran 1684613114, Iran
e-mail: moslem_akbari@mecheng.iust.ac.ir

Alireza Khoeini Poorfar

Combustion Research Laboratory,
Department of Energy Conversion,
School of Mechanical Engineering,
Iran University of Science and
Technology (IUST),
Tehran 1684613114, Iran
e-mail: alirezapoorfar@iust.ac.ir

Abolfazl Afzalabadi

Combustion Research Laboratory,
Department of Energy Conversion,
School of Mechanical Engineering,
Iran University of Science and
Technology (IUST),
Tehran 1684613114, Iran
e-mail: a_afzlabadi@mecheng.iust.ac.ir

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received February 9, 2016; final manuscript received May 30, 2016; published online June 27, 2016. Assoc. Editor: Antonio J. Bula.

J. Energy Resour. Technol 139(1), 012202 (Jun 27, 2016) (7 pages) Paper No: JERT-16-1081; doi: 10.1115/1.4033862 History: Received February 09, 2016; Revised May 30, 2016

The main aim of this research is focused on determining the velocity and particle density profiles across the flame propagation of microlycopodium dust particles. In this model, it is tried to incorporate the forces acting on the particles such as thermophoretic, gravitational, and buoyancy in the Lagrangian equation of motion. For this purpose, it is considered that the flame structure has four zones (i.e., preheat, vaporization, reaction, and postflame zones) and the temperature profile, as the unknown parameter in the thermophoretic force, is extracted from this model. Consequently, employing the Lagrangian equation with the known elements results in the velocity distribution versus the forefront of the combustion region. Satisfactory agreement is achieved between the present model and previously published experiments. It is concluded that the maximum particle concentration and velocity are gained on the flame front with the gradual decrease in the distance away from this location.

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References

Figures

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Fig. 1

The structure of the flame propagation through the mixture of microlycopodium dust particles and air

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Fig. 2

Considered control volume on the flame front of the combustion region of lycopodium particles

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Fig. 3

The effect of flame velocity on the Lt profile versus mass particle concentration (Ñs) for the mixture of microlycopodium dust particles and air

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Fig. 4

Particle velocity profile versus the front edge of the combustion region at Vf=39 cm/s and Ñs=47 g/m3

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Fig. 5

Particle velocity profile versus the front edge of the combustion region at Vf=47 cm/s and Ñs=122 g/m3

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Fig. 6

Relative velocity profile versus the front edge of the combustion region: (a) Vf=39 cm/s,  Ñs=47 g/m3 and (b) Vf=47 cm/s,  Ñs=122 g/m3

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Fig. 7

Particle number density profile versus the front edge of the combustion region at Vf=40 cm/s and Ñs=47 g/m3

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Fig. 8

Particle number density profile versus the front edge of the combustion region at Vf=45 cm/s and Ñs=122 g/m3

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