Details
| Original language | English |
|---|---|
| Title of host publication | ASME Turbo Expo 2005: Power for Land, Sea, and Air |
| Pages | 813-819 |
| Number of pages | 7 |
| Publication status | Published - 2005 |
| Externally published | Yes |
| Event | ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future - Reno-Tahoe, NV, United States Duration: 6 Jun 2005 → 9 Jun 2005 |
Abstract
Electric field control of combustion offers the potential of stabilizing flames and reducing emissions with comparatively little effort. Previous investigations of the effects of electric fields on flames were restricted to atmospheric pressure and the question whether field effects persist at higher pressures remained open. In the present work effects of electric fields on flame behavior are established for pressures up to 10 bar without any indication that this should be an upper limit. Voltage-current measurements and optical emission spectroscopy gave clear evidence that at all experimental conditions under investigation electric field induced ionization and dissociation reactions were negligible with regard to the combustion process. Thus it is concluded that all observed effects are due to electro-hydrodynamic distortions of the gas flow caused by electrostatic forces acting on the ions generated in the reaction zones of the flames. The concentration of pollutants such as CO, NO and NO2 in the presence of an electric field depends on the ratio U/p of electrode voltage U and pressure p which implies that the electric field strength required to obtain a given effect increases linearly with pressure. In an electric field directed towards the burner CO emissions could be reduced by about 90 %, irrespective of pressure. The decrease of CO was accompanied by an increase of NOx by about 20 %. The electric power required for a CO reduction of 90 % amounted to 0.1 % of the thermal power. The improvement of the lean blow-off limit upon application of an electric field observed so far ranges from 1 to 3 % and increases with pressure.
Keywords
- Electric-field control, Electro-hydrodynamics, High-pressure combustion, Pollutant emissions, Stability
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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ASME Turbo Expo 2005: Power for Land, Sea, and Air . 2005. p. 813-819.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Electro-hydrodynamic control of premixed turbulent methane flames at pressures above 1 atm
AU - Hammer, T.
AU - Lins, G.
AU - Branston, D. W.
AU - Dinkelacker, F.
AU - Sakhrieh, A.
AU - Leipertz, A.
PY - 2005
Y1 - 2005
N2 - Electric field control of combustion offers the potential of stabilizing flames and reducing emissions with comparatively little effort. Previous investigations of the effects of electric fields on flames were restricted to atmospheric pressure and the question whether field effects persist at higher pressures remained open. In the present work effects of electric fields on flame behavior are established for pressures up to 10 bar without any indication that this should be an upper limit. Voltage-current measurements and optical emission spectroscopy gave clear evidence that at all experimental conditions under investigation electric field induced ionization and dissociation reactions were negligible with regard to the combustion process. Thus it is concluded that all observed effects are due to electro-hydrodynamic distortions of the gas flow caused by electrostatic forces acting on the ions generated in the reaction zones of the flames. The concentration of pollutants such as CO, NO and NO2 in the presence of an electric field depends on the ratio U/p of electrode voltage U and pressure p which implies that the electric field strength required to obtain a given effect increases linearly with pressure. In an electric field directed towards the burner CO emissions could be reduced by about 90 %, irrespective of pressure. The decrease of CO was accompanied by an increase of NOx by about 20 %. The electric power required for a CO reduction of 90 % amounted to 0.1 % of the thermal power. The improvement of the lean blow-off limit upon application of an electric field observed so far ranges from 1 to 3 % and increases with pressure.
AB - Electric field control of combustion offers the potential of stabilizing flames and reducing emissions with comparatively little effort. Previous investigations of the effects of electric fields on flames were restricted to atmospheric pressure and the question whether field effects persist at higher pressures remained open. In the present work effects of electric fields on flame behavior are established for pressures up to 10 bar without any indication that this should be an upper limit. Voltage-current measurements and optical emission spectroscopy gave clear evidence that at all experimental conditions under investigation electric field induced ionization and dissociation reactions were negligible with regard to the combustion process. Thus it is concluded that all observed effects are due to electro-hydrodynamic distortions of the gas flow caused by electrostatic forces acting on the ions generated in the reaction zones of the flames. The concentration of pollutants such as CO, NO and NO2 in the presence of an electric field depends on the ratio U/p of electrode voltage U and pressure p which implies that the electric field strength required to obtain a given effect increases linearly with pressure. In an electric field directed towards the burner CO emissions could be reduced by about 90 %, irrespective of pressure. The decrease of CO was accompanied by an increase of NOx by about 20 %. The electric power required for a CO reduction of 90 % amounted to 0.1 % of the thermal power. The improvement of the lean blow-off limit upon application of an electric field observed so far ranges from 1 to 3 % and increases with pressure.
KW - Electric-field control
KW - Electro-hydrodynamics
KW - High-pressure combustion
KW - Pollutant emissions
KW - Stability
UR - http://www.scopus.com/inward/record.url?scp=27744581715&partnerID=8YFLogxK
U2 - 10.1115/GT2005-69137
DO - 10.1115/GT2005-69137
M3 - Conference contribution
AN - SCOPUS:27744581715
SN - 0-7918-4725-X
SP - 813
EP - 819
BT - ASME Turbo Expo 2005: Power for Land, Sea, and Air
T2 - ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future
Y2 - 6 June 2005 through 9 June 2005
ER -