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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Nguyen, Quang-Viet |
| Copyright Year | 2002 |
| Abstract | Experimental evidence correlating equivalence ratio fluctuations with combustion instabilities and NOX emissions in a jet-A fueled lean premixed prevaporized (LPP) combustor utilizing a non-proprietary ‘generic’ fuel injector is presented. Real-time laser absorption measurements of equivalence ratio, together with dynamic combustor pressure, flame luminosity and fuel pressure were obtained at inlet air conditions up to 16.7 atm and 817 K. From this data, an extensive database of real-time variables was obtained for the purposes of providing validation data for future studies of LPP combustion modeling. In addition, time and frequency space analysis of the data revealed measurable levels of acoustic coupling between all variables. Equivalence ratio and dynamic pressure cross-correlations were found to predict the level of combustion instability. Furthermore, NOX production was found to follow the root-mean-square (RMS) flame luminosity and RMS combustor dynamic pressure. However, the unmixedness of the fuel-air mixture was not found to predict NOX production in this combustor. The generic LPP injector, although not optimized for low-emissions or combustion stability, provides some of the essential features of real injectors for the purposes of studying the relationship between fluctuations in equivalence ratios and combustion instability. In particular, the fuel premixer advection time was found to have a significant and direct impact on the level of combustion instability. The results of this work support the time-lag concept for avoiding combustion instability when designing injector/premixers in LPP combustors. |
| Sponsorship | International Gas Turbine Institute |
| Starting Page | 275 |
| Ending Page | 283 |
| Page Count | 9 |
| File Format | |
| ISBN | 0791836061 |
| DOI | 10.1115/GT2002-30060 |
| e-ISBN | 0791836010 |
| Volume Number | Volume 1: Turbo Expo 2002 |
| Conference Proceedings | ASME Turbo Expo 2002: Power for Land, Sea, and Air |
| Language | English |
| Publisher Date | 2002-06-03 |
| Publisher Place | Amsterdam, The Netherlands |
| Access Restriction | Subscribed |
| Subject Keyword | Stability Fuel injectors Combustion Acoustics Fuels Pressure Modeling Emissions Design Flames Absorption Databases Lasers Ejectors Fluctuations (physics) Nitrogen oxides Combustion chambers |
| Content Type | Text |
| Resource Type | Article |
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