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Infrared Borescopic Analysis of Ignition and Combustion Variability in a Heavy-Duty Natural-Gas Engine
Technical Paper
2018-01-0632
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Optical imaging diagnostics of combustion are most often performed in the visible spectral band, in part because camera technology is most mature in this region, but operating in the infrared (IR) provides a number of benefits. These benefits include access to emission lines of relevant chemical species (e.g. water, carbon dioxide, and carbon monoxide) and obviation of image intensifiers (avoiding reduced spatial resolution and increased cost). High-speed IR in-cylinder imaging and image processing were used to investigate the relationships between infrared images, quantitative image-derived metrics (e.g. location of the flame centroid), and measurements made with in-cylinder pressure transducers (e.g. coefficient of variation of mean effective pressure). A 9.7-liter, inline-six, natural-gas-fueled engine was modified to enable exhaust-gas recirculation (EGR) and provide borescopic optical access to one cylinder for two high-speed infrared cameras. A high-energy inductively coupled ignition system delivered 140 mJ of energy during each spark event. The engine was operated at 1000 rev/min and an indicated mean effective pressure of 6.8 bar over a range of air/fuel equivalence ratios, λ, (1 to 1.6) and EGR rates (2% to 23%). Strong emission lines of water are present in the sensitivity band of the cameras (1.0 to 1.7 μm) and can be used as a proxy for the flame front and burned-gas regions. Images were recorded every 5.5 degrees of crank angle (CAD); multiple measurements were interleaved to provide statistical information every 0.5 CAD. The greater cyclic variation resulting from lean/dilute operation is apparent in the images; the image-derived metrics measured early in the cycle correlate strongly with pressure-derived metrics measured later. Centroids calculated from the images show that flames farther from the head and spark plug yield better combustion, which is not evident in the pressure data.
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Gross, M., Mazacioglu, A., Kern, J., and Sick, V., "Infrared Borescopic Analysis of Ignition and Combustion Variability in a Heavy-Duty Natural-Gas Engine," SAE Technical Paper 2018-01-0632, 2018, https://doi.org/10.4271/2018-01-0632.Data Sets - Support Documents
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References
- Sick , V. High Speed Imaging in Fundamental and Applied Combustion Research Proceedings of the Combustion Institute 34 2 3509 3530 2013 10.1016/j.proci.2012.08.012
- Sick , V. , Drake , M.C. , and Fansler , T.D. High-Speed Imaging for Direct-Injection Gasoline Engine Research and Development Experiments in Fluids 49 4 937 947 2010 10.1007/s00348-010-0891-3
- Agrawal , G.P. Fiber-Optic Communication Systems New York John Wiley & Sons 1997
- Turns , S.R. An Introduction to Combustion: Concepts and Applications 3rd New York McGraw-Hill 2012
- Ludwig , C. B. , Malkmus , W. , Reardon , J. , Thomson , J. , et al. 1973 Handbook of Infrared Radiation from Combustion Gases Washington, D.C. Natioinal Aeronautics and Space Administration
- Frank , J. , Barlow , R. , and Lundquist , C. Radiation and Nitric Oxide Formation in Turbulent Non-Premixed Jet Flames Proceedings of the Combustion Institute 28 1 447 454 2000
- Brookes , S. and Moss , J. Measurements of Soot Production and Thermal Radiation from Confined Turbulent Jet Diffusion Flames of Methane Combustion and Flame 116 1 49 61 1999
- Schiffmann , P. , Reuss , D.L. , and Sick , V. International Journal of Engine Research 2017
- Chen , H. , Lillo , P.M. , and Sick , V. Three-Dimensional Spray-Flow Interaction in a Spark-Ignition Direct-Injection Engine International Journal of Engine Research 17 1 129 138 2016
- Chen , H. , Xu , M. , Hung , D.L. , and Zhuang , H. Cycle-To-Cycle Variation Analysis of Early Flame Propagation in Engine Cylinder Using Proper Orthogonal Decomposition Experimental Thermal and Fluid Science 58 48 55 2014
- Hung , D.L. , Chen , H. , Xu , M. , Yang , J. et al. Experimental Investigation of the Variations of Early Flame Development in a Spark-Ignition Direct-Injection Optical Engine Journal of Engineering for Gas Turbines and Power 136 10 101503 2014
- Schiffmann , P. 2016
- Mazacioglu , A. , Gross , M. , Kern , J. , and Sick , V. Infrared Borescopic Evaluation of High-Energy and Long-Duration Ignition Systems for Lean/Dilute Combustion in Heavy-Duty Natural-Gas Engines SAE Technical Paper 2018-01-1149 2018
- Otsu , N. A Threshold Selection Method from Gray-Level Histograms IEEE Transactions on Systems, Man, and Cybernetics 9 1 62 66 1979
- Ayala , F.A. and Heywood , J.B. Lean SI Engines: The Role of Combustion Variability in Defining Lean Limits SAE Technical Paper 2007-24-0030 2007 10.4271/2007-24-0030
- Matekunas , F.A. Modes and Measures of Cyclic Combustion Variability SAE Technical Paper 830337 1983 10.4271/830337