AC electric field induced vortex in laminar coflow diffusion flames
Type
Conference PaperAuthors
Xiong, Yuan
Cha, Min Suk

Chung, Suk Ho

KAUST Department
Clean Combustion Research CenterCombustion and Laser Diagnostics Laboratory
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2014-09-22Online Publication Date
2014-09-22Print Publication Date
2015Permanent link to this record
http://hdl.handle.net/10754/575890
Metadata
Show full item recordAbstract
Experiments were performed by applying sub-critical high-voltage alternating current (AC) to the nozzle of laminar propane coflow diffusion flames. Light scattering, laser-induced incandescence and laser-induced fluorescence techniques were used to identify the soot zone, and the structures of OH and polycyclic aromatic hydrocarbons (PAHs). Particle image velocimetry was adopted to quantify the velocity field. Under certain AC conditions of applied voltage and frequency, the distribution of PAHs and the flow field near the nozzle exit were drastically altered, leading to the formation of toroidal vortices. Increased residence time and heat recirculation inside the vortex resulted in appreciable formation of PAHs and soot near the nozzle exit. Decreased residence time along the jet axis through flow acceleration by the vortex led to a reduction in the soot volume fraction in the downstream sooting zone. Electromagnetic force generated by AC was proposed as a viable mechanism for the formation of the toroidal vortex. The onset conditions for the vortex formation supported the role of an electromagnetic force acting on charged particles in the flame zone. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.Sponsors
Research reported in this publication was supported by KAUST-AEA project.Publisher
Elsevier BVConference/Event name
30th International Symposium on Combustionae974a485f413a2113503eed53cd6c53
10.1016/j.proci.2014.08.027