Accession Number : ADA469722


Title :   Enhancement of Combustion and Flame Stabilization Using Transient Non-Equilibrium Plasma


Descriptive Note : Final technical rept. 1 Jan 2004-31 Dec 2006


Corporate Author : PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING


Personal Author(s) : Ju, Yiguang ; Ombrello, Timothy ; Fridman, Alexander ; Gutsol, Alexander ; Gangoli, Shailesh


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a469722.pdf


Report Date : 31 Mar 2007


Pagination or Media Count : 138


Abstract : The effect of non-equilibrium plasma on both partially premixed and non-premixed flames was investigated through the development of a newly integrated magnetic gliding arc (MGA) system. The lifted jet diffusion flame experiments showed a significant enhancement of the flame stabilization with plasma discharge in the air co-flow. The counterflow experiments also demonstrated that the extinction limits were extended dramatically. Laser diagnostics of flame temperature and OH distribution using planar Rayleigh scattering and planar laser-induced fluorescence revealed that the plasma-flame interaction at low air temperature was dominated by thermal effects due to rapid radical quenching. Counterflow ignition experiments for CH4-air and H2-air non-premixed flames demonstrated clearly that the MGA significantly decreased the ignition temperatures via kinetic enhancement by the NOx, catalytic effect. Numerical modeling showed that there were two ignition regimes for plasma enhanced ignition, kinetic at low strain rates and thermal at high strain rates. Comparison between experiment and simulation were in good agreement and also suggested the possibility of enhancement by ions, excited species or other mechanisms. Theoretical analysis of minimum ignition energy in a quiescent mixture showed that the production of small hydrocarbon fuel fragments by plasma discharge also led to a significant decrease of ignition energy due to radiation and transport coupling.


Descriptors :   *COMBUSTION , MATHEMATICAL MODELS , SIMULATION , IONS , RADIATION , FUELS , HYDROCARBONS , LASER DIAGNOSTICS , IGNITION , RAYLEIGH SCATTERING , TEMPERATURE , EXPERIMENTAL DATA , ENERGY , STRAIN RATE


Subject Categories : Operations Research
      Plasma Physics and Magnetohydrodynamics
      Combustion and Ignition


Distribution Statement : APPROVED FOR PUBLIC RELEASE