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Extending the Lean Stability Limits of Gasoline Using a Microwave-Assisted Spark Plug
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 12, 2011 by SAE International in United States
Annotation ability available
The extension of the lean stability limits of gasoline-air mixtures using a microwave-assisted spark plug has been investigated. Experiments are conducted on a 1200 RPM single-cylinder Waukesha Cooperative Fuel Research (CFR) engine at two compression ratios: 7:1 and 9:1; and four different levels of microwave energy input per cycle (prior to accounting for transmission losses): 0 mJ (spark only), 130 mJ, 900 mJ, and 1640 mJ. For various microwave energy inputs, the effects upon stability limits are explored by gradually moving from stoichiometric conditions to increasingly lean mixtures. The coefficient of variation (COVIMEP) of the indicated mean effective pressure (IMEP) is used as an indication of the stability limits.
Specific characteristics of microwave-assisted ignition are identified. Microwave enhancement extends stability limits into increasingly lean regions, but slow and partial burning at the leanest mixtures curb efficiency gains. Microwave assistance decreases occurrence of misfire and partial-burn by increasing early heat release in very lean mixtures, but engine operation is unaffected at closer-to-stoichiometric conditions. Increasing microwave energy input can improve combustion characteristics as compared to low-energy microwave enhancement, but a point is observed beyond which increased microwave energy input provides limited benefits. Microwave-enhanced ignition technology could provide an effective means of enabling increasingly lean combustion in spark-ignited engines, allowing reduced throttling losses and improved efficiency. Unfortunately, in the slow-burning CFR engine setup, reduction in emissions of oxides of nitrogen (NOx) through lean burn is not sufficient for compliance with current regulations, making exhaust aftertreatment a necessity.
CitationDeFilippo, A., Saxena, S., Rapp, V., Dibble, R. et al., "Extending the Lean Stability Limits of Gasoline Using a Microwave-Assisted Spark Plug," SAE Technical Paper 2011-01-0663, 2011, https://doi.org/10.4271/2011-01-0663.
- Kuroda, H. Nakajima, Y. Sugihara, K. Takagi, Y. Muranaka, S. “The Fast Burn with Heavy EGR, New Approach for Low NOx and Improved Fuel Economy,” SAE Technical Paper 780006 1978 10.4271/780006
- Quader, A. A. “What Limits Lean Operation in Spark Ignition Engines-Flame Initiation or Propagation?,” SAE Technical Paper 760760 1976 10.4271/760760
- Hill, P. G. Zhang, D. “The effects of swirl and tumble on combustion in spark-ignition engines.” Progress in Energy and Combustion Science: 20 5 373 429 1994 10.1016/0360-1285(94)90010-8
- Bell, S. R. Gupta, M. “Extension of the Lean Operating Limit for Natural Gas Fueling of a Spark Ignited Engine Using Hydrogen Blending.” Combustion Science and Technology: 123 1-6 23 48 1997 10.1080/00102209708935620
- Nakamura, N. Baika, T. Shibata, Y. “Multipoint Spark Ignition for Lean Combustion,” SAE Technical Paper 852092 1985 10.4271/852092
- Dale, J. D. Checkel, M. D. Smy, P. R. “Application of high energy ignition systems to engines.” Progress in Energy and Combustion Science: 23 5-6 379 398 1997 10.1016/S0360-1285(97)00011-7
- Starikovskaia, S. M. “Plasma assisted ignition and combustion.” Journal of Physics D: Applied Physics: 39 R265 R299 2006 10.1088/0022-3727/39/16/R0
- Shibkov, V. M. Aleksandrov, A. A. Chernikov, V. A. Ershov, A. P. Shibkova, L. V. “Microwave and Direct-Current Discharges in High-Speed Flow: Fundamentals and Application to Ignition.” Journal of Propulsion and Power: 25 1 123 137 2009 10.2514/1.24803
- Stockman, E. Zaidi, S. Miles, R. Carter, C. Ryan, M. “Measurements of combustion properties in a microwave enhanced flame.” Combustion and Flame: 156 7 1453 1461 2009 10.1016/j.combustflame.2009.02.006
- Ikeda, Y. Nishiyama, A. Katano, H. Kaneko, M. Jeong, H. “Research and Development of Microwave Plasma Combustion Engine (Part II: Engine Performance of Plasma Combustion Engine),” SAE Technical Paper 2009-01-1049 2009 10.4271/2009-01-1049
- Tanoue, K. Kuboyama, T. Moriyoshi, Y. Hotta, E. et al. “Extension of Lean and Diluted Combustion Stability Limits by Using Repetitive Pulse Discharges,” SAE Technical Paper 2010-01-0173 2010 10.4271/2010-01-0173
- Pertl, F. A. Smith, J. E. “Electromagnetic design of a novel microwave internal combustion engine ignition source, the quarter wave coaxial cavity igniter.” Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering: 223 11 1405 1417 2009 10.1243/09544070JAUTO1215
- Kettner, M. Nauwerck, A. Spicher, U. Seidel, J. Linkenheil, K. “Microwave-based Ignition Principle for Gasoline Engines with Direct Injection and Spray Guided Combustion System.” MTZ June 2006 29 31
- Fridman, A. “Plasma Chemistry” Cambridge University Press Cambridge 978-0521847353 2008
- Ombrello, T. Won, S. H. Ju, Y. Williams, S. “Flame propagation enhancement by plasma excitation of oxygen. Part II: Effects of O 2 (a 1 Δ g ).” Combustion and Flame: 157 10 1916 1928 2010 10.1016/j.combustflame.2010.02.004
- Bourig, A. Thevenin, D. Martin, J.P. Janiga, G. Zahringer, K. “Numerical modeling of H2-O2 flames involving electronically-excited species O 2 , O and OH.” Proceedings of the Combustion Institute: 32 2 3171 3179 2009 10.1016/j.proci.2008.09.004
- Laux, C. O. Yu, L. Packan, D. M. Gessman, R. J. Pierrot, L. “Ionization Mechanisms in Two-Temperature Air Plasmas.” AIAA 99-3476 1999 10.1.1.22.9617
- Ju, Y. Macheret, S. O. Shneider, M. N. Miles, R. B. “Numerical study of the effect of microwave discharge on the premixed methane-air flame.” AIAA 2004-3707 2004
- Groff, E. G. Krage, M. K. “Microwave Effects on Premixed Flames.” Combustion and Flame: 56 3 293 306 1984 10.1016/0010-2180(84)90063-4
- Clements, R. M. Smith, R. D. Smy, P.R. “Enhancement of Flame Speed by Intense Microwave Radiation.” Combustion Science and Technology: 26 1-2 77 81 1981 10.1080/00102208108946948
- Stockman, E. S. Zaidi, S. H. Miles, R. B. “Mechanisms of Hydrocarbon Laminar Flame Speed Enhancement with Microwaves.” AIAA 2008-1364 2008
- Ikeda, Y. Nishiyama, A. Wachi, Y. Kaneko, M. “Research and Development of Microwave Plasma Combustion Engine (Part I: Concept of Plasma Combustion and Plasma Generation Technique),” SAE Technical Paper 2009-01-1050 2009 10.4271/2009-01-1050
- Ideka, Y. Nishiyama, A. Kaneko, M. “Microwave Enhanced Ignition Process for Fuel Mixture at Elevated Pressure of IMPa.” AIAA 2009-223 2009
- Heywood, J. B. “Internal Combustion Engine Fundamentals” McGraw-Hill New York 978-00702863751988 1988