Accession Number:

ADA561129

Title:

Combustion Dynamics of Plasma-Enhanced Premixed and Nonpremixed Flames

Descriptive Note:

Journal article

Corporate Author:

MICHIGAN STATE UNIV EAST LANSING DEPT OF MECHANICAL ENGINEERING

Personal Author(s):

• Rao, Xing
• Hammack, Steve
• Lee, Tonghun
• Carter, Campbell
• Matveev, Igor B.

Report Date:

2010-12-01

Pagination or Media Count:

8.0

Abstract:

Combustion dynamics are investigated for plasma-enhanced methane-air flames in premixed and nonpremixed configurations using a transient arc dc plasmatron. Planar laser-induced fluorescence images of hydroxyl OH and carbon monoxide CO radicals are obtained over a range of equivalence ratios phi 0.7-1.3, flow rates 6-18 LPM, and plasma powers 100-900 mA to monitor radical propagation and in situ fuel reforming. The flow rates presented here are outside the range of normal flame stability. In the nonpremixed mode, the fuel is injected separately as a coflow around the plasma discharge resulting in a unique two-cone flame front geometry, and the flame stability is mainly dependent on the flow dynamics. For premixed flames, partial oxidation occurs inside the chamber, resulting in higher energy conversion efficiencies, and stability is shown to be sensitive to the combustion chemistry. Both configurations are significantly influenced by in situ fuel reforming at higher plasma powers.

Descriptors:

• *COMBUSTION
• CARBON MONOXIDE
• FLAMES
• HYDROXYL RADICALS
• LASER INDUCED FLUORESCENCE
• PLASMAS(PHYSICS)
• REPRINTS

Subject Categories:

• Plasma Physics and Magnetohydrodynamics
• Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE