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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Kopecek, Herbert Charareh, Soren Lackner, Max Forsich, Christian Winter, Franz Klausner, Johann Herdin, Gu¨nther Wintner, Ernst |
| Copyright Year | 2003 |
| Abstract | Methane-air mixtures at high fill pressures up to 30 bar and high temperatures up to 200 °C were ignited in a high pressure chamber with automated fill control by a 5 ns pulsed Nd:YAG laser at 1064 nm wavelength. Both, the minimum input laser pulse energy for ignition and the transmitted fraction of energy through the generated plasma were measured as a function of the air/fuel-equivalence ratio (λ). The lean side ignition limit of methane-air mixtures was found to be λ = 2.4. However, only λ < 2.2 seems to be practically usable. As a comparison, the limit for conventional spark plug ignition of commercial natural gas engines is λ = 1.8. Only with excessive efforts λ = 2.0 can be spark-ignited. The transmitted pulse shape through the laser-generated plasma was determined temporally as well as its dependence on input laser energy and properties of the specific gases interacting. For a first demonstration of the practical applicability of laser ignition, one cylinder of a 1 MW natural gas engine was ignited by a similar 5 ns pulsed Nd:YAG laser at 1064 nm. The engine worked successfully at λ = 1.8 for a first test period of 100 hours without any interruption due to window fouling and other disturbances. Lowest values for NOx emission were achieved at λ = 2.05 (NOx = 0.22 g/KWh). Three parameters obtained from accompanying spectroscopic measurements, namely water absorbance, flame emission and the gas inhomogeneity index have proven to be a powerful tool to judge laser-induced ignition of methane-air mixtures. The following effects were determined by the absorption spectroscopic technique: formation of water in the vicinity of the laser spark (semi-quantitative); characterization of ignition (ignition delay, incomplete ignition, failed ignition); homogeneity of the gas phase in the vicinity of the ignition and the progress of combustion. |
| Sponsorship | Internal Combustion Engine Division |
| Starting Page | 147 |
| Ending Page | 154 |
| Page Count | 8 |
| File Format | |
| ISBN | 0791836789 |
| DOI | 10.1115/ICES2003-0614 |
| e-ISBN | 079183669X |
| Volume Number | Design, Application, Performance and Emissions of Modern Internal Combustion Engine Systems and Components |
| Conference Proceedings | ASME 2003 Internal Combustion Engine Division Spring Technical Conference |
| Language | English |
| Publisher Date | 2003-05-11 |
| Publisher Place | Salzburg, Austria |
| Access Restriction | Subscribed |
| Subject Keyword | Laser ignition Methane-air mixtures Laser-induced plasma High pressure Linear absorption spectroscopy Methane High pressure (physics) Lasers Plasmas (ionized gases) Ignition |
| Content Type | Text |
| Resource Type | Article |
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