Soot Formation and Destruction in High-Pressure Flames with Real Fuels
Final rept. 15 May 2010-14 May 2013
NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
Pagination or Media Count:
The overall objective of this project was to increase the understanding of the effects of pressure on soot formation and destruction in laminar diffusion flames burning both simple hydrocarbon and complex real fuels. A more complete understanding of the soot formation processes at elevated pressure e.g., 30 atm will enable the design of more efficient diesel engines. Higher efficiency will help reduce the logistical demand transportation fuels place on the entire DoD and thus increase the tooth to tail ratio, enhancing force sustainability. By reducing soot emissions, survivability of assets will be increased by reducing the vehicle s IR signature. First, experiments were conducted for ethylene flames with different diluents. Quantification of hydrocarbon species was done by extraction of samples using a quartz micro probe along the centerline of the flame and analyzing them using both a GCMSFID and a TCD to calculate the mole fraction of the various species in the sample volume. The flame temperature was measured by both thermocouples and two-color pyrometry. Soot volume fraction, primary particle size, and number density were also measure by line of sight attenuation. The pressure effects on the measured quantities are investigated. Second, laminar flames of pre-vaporized liquid fuels are being measured with the aid of a custom built electrospray vaporizer.
- Combustion and Ignition