Two-dimensional measurements of soot in a turbulent diffusion diesel flame: the effects of injection pressure, nozzle orifice diameter, and gas density
Journal article, 2018

© 2018, Published with license by Taylor & Francis Group, LLC © 2018 [Chengjun Du, Sven Andersson, Mats Andersson]. Two-dimensional light extinction, flame luminosity, and OH* chemiluminescence images were captured at a constant ambient temperature of 823 K and two gas densities (20 and 26 kg/m3), with injection pressures of 800–2500 bar using nozzle orifices with diameters of 0.19 and 0.10 mm. Soot volume fraction and OH distribution images were obtained using the Abel inversion method, and the local equivalence ratio in the lift-off length region was predicted. The results show that the equivalence ratio along the jet’s center at the lift-off length (ϕCL) was found to play a critical role in soot formation. Reductions in ϕCLthickened the OH zone in the upstream region of the jet, reducing the volume corresponding to the maximum soot volume fraction. The expansion of the OH zone also helped reduce the sooting zone’s width. Under high sooting conditions (e.g., ϕCL>3.5), the sooting zone width in the downstream jet was independent of ϕCL.

Laser extinction

Diesel spray

OH* Chemiluminescence

Local equivalence ratio

Soot formation and oxidation

Author

Chengjun Du

Chalmers, Mechanics and Maritime Sciences, Combustion

Sven B Andersson

Chalmers, Mechanics and Maritime Sciences, Combustion

Mats Andersson

Chalmers, Mechanics and Maritime Sciences, Combustion

Combustion Science and Technology

0010-2202 (ISSN) 1563-521X (eISSN)

Vol. 190 9 1659-1688

Subject Categories

Astronomy, Astrophysics and Cosmology

Atom and Molecular Physics and Optics

Geophysics

DOI

10.1080/00102202.2018.1461850

More information

Latest update

1/28/2019