Effect of Jet Impingement on Nano-aerosol Soot Formation in a Paraffin-Oil Flame

Masoud Darbandi (), Majid Ghafourizadeh and Mahmud Ashrafizaadeh ()
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Masoud Darbandi: Sharif University of Technology, Department of Aerospace Engineering, Center of Excellence in Aerospace Systems, Institute for Nanoscience and Nanotechnology
Majid Ghafourizadeh: Sharif University of Technology, Department of Aerospace Engineering, Center of Excellence in Aerospace Systems
Mahmud Ashrafizaadeh: Isfahan University of Technology, Department of Mechanical Engineering

A chapter in Mathematical and Computational Approaches in Advancing Modern Science and Engineering, 2016, pp 89-99 from Springer

Abstract: Abstract In this paper, the effects of mico-jet Micro-jet impingement Impingement on the formation of soot nano-particles Nano-particle , CO, CO 2, and C 6H 6 species in a turbulent Turbulent paraffin-oil Paraffin-oil flame Flame are investigated numerically. In this regard, we use a two-equation κ-ε turbulence model, a PAH-inception two-equation soot model, a detailed chemical kinetic Detailed chemical kinetic consisting of 121 species and 2613 elementary reactions, and steady flamelet Flame combustion Combustion model. We take into account the turbulence-chemistry interaction by using presumed-shape probability density functions PDFs. We also take into account the radiation heat transfer of soot and gases assuming optically-thin flame Flame . In the first place, we solve a documented experimental test case and compare the flame Flame structure to evaluate our numerical results. Then, we embed a micro-scale injector Injector at the burner Burner wall, split the incoming air-flow between primary and secondary streams, inject the secondary air into the burner Burner via the embeded injector Injector , and compare the results for different values of impinging-jet mass flow rate. Our results show that the mico-jet Micro-jet impingement Impingement affects the reactive flow behavior within the burner Burner and results in a compact-flame Flame near the fuel-injector Fuel-injector nozzle. Our calculations also show that the emission of CO 2 is slightly affected by the mico-jet Micro-jet impingement Impingement . They show that increasing the mass flow rate of the micro-impinging-jet effectively reduces the formation and emission of the soot nano-aerosol Aerosol and CO, C 6H 6 pollutants Pollutant . It is also found that mico-jet Micro-jet impingement Impingement leads to a more uniform profiles of temperature, soot volume fraction, and mass fractions of CO, CO 2, and C 6H 6 at the burner Burner outlet.

Keywords: Mass Flow Rate; Recirculation Zone; Mixture Fraction; Soot Formation; Scalar Dissipation Rate (search for similar items in EconPapers)
Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-319-30379-6_9

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DOI: 10.1007/978-3-319-30379-6_9

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