Sage Kokjohn

PhD expected Spring 2011

Project

Diesel HCCI Combustion Optimization Using Variable Geometry Sprays. Using adaptive injection strategies to improve performance and reduce pollutant emissions.

Long Term Goals

Gain an in-depth understanding of physical processes occurring during spray and combustion events. Develop advanced fluid dynamics and combustion models to improve the efficiency of the engine development process.

Education

• 2008 MSME University of Wisconsin - Madison
• 2006 BSME Iowa State University

Experience

• Current - University of Wisconsin Madison Engine Research Center - Graduate Research Assistant
• 2006 - Iowa State University Engine Research - Undergraduate Research Assistant
• 2006 - Toyota Engine Research and Development - Computational Fluid Dynamics Intern
• 2005 - Caterpillar Global Engine Development - Performance Analyst Intern
• 2004 - Mercury Marine - Engine Test and Development Co-op

Publications

• Kokjohn, S.L., Splitter, D.A., Hanson, R.M., Reitz, R.D., Manente, V. and Johansson, B., “Modeling Charge Preparation and Combustion in Diesel Fuel, Ethanol, and Dual Fuel PCCI Engines,” Accepted for publication, Atomization and Sprays, 2011.
• Hanson, R.M., Kokjohn, S.L., Splitter, D.A., and Reitz, R.D., "Low Load Investigation of Reactivity Controlled Compression Ignition (RCCI) Combustion in a Heavy-Duty Engine," SAE Paper 2011-01-0361, 2011.
• Splitter, D.A., Hanson, R.M., Kokjohn, S.L., and Reitz, R.D., "Reactivity Controlled Compression Ignition (RCCI) Engine Operation at Mid and High Loads with Conventional and Alternative Fuels," SAE Paper 2011-01-0363, 2011.
• Puduppakkam, K.V., Kokjohn, S.L., Liang, L., Naik, C.V., Reitz, R.D., and Meeks, E., “Use of Detailed Kinetics and Advanced Chemistry-Solution Techniques in CFD to Investigate Dual-Fuel Engine Concepts”, SAE Paper 2011-01-0895, 2011.
• Bergin, M., Musu, E., Kokjohn, S., and Reitz, R.D., "Examination of Initialization and Geometric Details on the Results of CFD Simulations of Diesel Engines," ASME J. Eng. Gas Turbines Power, Vol. 133, Issue 4, pp. 44501, http://dx.doi.org/10.1115/1.4001941, 2011.
• Kokjohn, S.L., and Reitz, R.D., "Investigation of the Roles of Flame Propagation, Turbulent Mixing, and Volumetric Heat Release in Conventional and Low Temperature Diesel Combustion," Accepted for publication, ASME J. Eng. Gas Turbines Power, 2011.
• Kokjohn, S.L., Hanson, R.M., Splitter, D.A., and Reitz, R.D., "Fuel Reactivity Controlled Compression Ignition (RCCI): A Pathway to Controlled High-Efficiency Clean Combustion," Accepted for publication, International Journal of Engine Research, Special Issue on Fuel Efficiency, 2011.
• Curran, S., Prikhodko, V., Wagner, R., Cho, K., Sluder, C., Kokjohn, S., and Reitz, R.D., "In-Cylinder Fuel Blending of Gasoline/Diesel for Improved Efficiency and Lowest Possible Emissions on a Multi-Cylinder Engine,," SAE Paper 2010-01-2206, 2010.
• Splitter, D.A., Hanson, R.M., Kokjohn, S.L., Rein, K., Sanders, S., and Reitz, R.D., "An Optical Investigation of Ignition Processes in Fuel Reactivity Controlled PCCI Combustion," SAE paper 2010-01-0345, SAE Int. J. Engines, Vol. 3, No.1, pp. 142-162, 2010.
• Hanson, R.M., Reitz, R.D., Splitter, D.A., and Kokjohn, S.L., "An Experimental Investigation of Fuel Reactivity Controlled PCCI Combustion in a Heavy-Duty Engine," SAE paper 2010-01-0864, SAE Int. J. Engines, Vol. 3, No.1, pp. 700-716, 2010.
• Swor, T.A., Kokjohn, S.L., Andrie, M.J., and Reitz, R.D., "Improving Diesel Engine Performance Using Low and High Pressure Split Injections for Single Heat Release and Two-Stage Combustion," SAE paper 2010-01-0340, 2010.
• Kokjohn, S.L., and Reitz, R.D., "An investigation of charge preparation strategies for controlled PPCI combustion using a variable pressure injection system," International Journal of Engine Research, Volume 11, Number 4, pp. 257-282, DOI: 10.1243/14680874JER06409, 2010
• Kokjohn, S, Hanson, R., Splitter, D, and Reitz, R.D., "Experiments and Modeling of Dual Fuel HCCI and PCCI Combustion Using In-Cylinder Fuel Blending," ,SAE paper 2009-01-2647, 2009
• Kokjohn, S. L., and Reitz, R.D., A Modeling Study of Charge Preparation in an HCCI Engine Using a Variable Pressure Pulse (VPP) Injection System and Optimized PRF Blends, ICLASS-2009, 11th Triennial International Annual Conference on Liquid Atomization and Spray Systems, Vail, Colorado USA, July 30, 2009
• Kokjohn S.L., and Reitz, R.D., Investigation of Design Parameters in Partially Premixed Compression Ignition Combustion Using Adaptive Injection Strategies, Paper ICES2009-76030, Proceedings of ICES2009, ASME Internal Combustion Engine Division, Spring Technical Conference, Milwaukee, WI, May 03, 2009
• Bergin, M., Musu, E., Kokjohn, S., Reitz, R.D., Examination of Initialization and Geometric Details on the Results of CFD Simulations of Diesel Engines, Paper ICES2009-76053, Proceedings of ICES2009, ASME Internal Combustion Engine Division, Spring Technical Conference, Milwaukee, WI, May 03, 2009
• Kokjohn, S.L., Swor, T.A., Andrie, M.J., and Reitz, R.D., "Experiments and Modeling of Two-Stage Combustion in Low Emissions Diesel Engines," SAE Paper 2009-01-0127, 2009
• Shi, Y., Kokjohn, S.L., Ge, H.W., and Reitz, R.D., "Efficient Multi-dimensional Simulation of HCCI and DI Engine Combustion with Detailed Chemistry," SAE Paper 2009-01-0701, 2009
• Kokjohn, S., and Reitz, R.D., A Modeling Study of Charge Preparation and Combustion in an HCCI Engine Using a Variable Pressure Pulse (VPP) Injection System and Optimized PRF Blends," , International Multidimensional Engine Modeling User's Group Meeting, Detroit, MI, April 19, 2009
• Kokjohn, S. and Reitz, R.D., "A Computational Investigation of Two-Stage Combustion in a Light-Duty Diesel Engine," SAE Paper 2008-01-2412, SAE Int. J. Engines, Vol. 1(1), pp. 1083-1104, 2008
• Reitz, R.D., Kokjohn, S., Swor, T.A., and Andrie, M.J., "Experiments and Modeling of Two-Stage Combustion for Low Emissions Diesel Engines," , 14th Diesel Engine-Efficiency and Emissions Research (DEER) Conference, Dearborn, MI, August 04, 2008 - August 07, 2008
• Kokjohn, S., and Reitz, R.D., "A Computational Investigation of Two-Stage Combustion in a Light-Duty Diesel Engine," , ILASS Americas, 21st Annual Conference on Liquid Atomization and Spray Systems, Orlando, Florida, May 18, 2008 - May 21, 2008
• Kokjohn, S., and Reitz, R.D., "A Computational Investigation of Two-Stage Combustion in a Light-Duty Diesel Engine," , International Multidimensional Engine Modeling User's Group Meeting, Detroit, MI, April 13, 2008
• Abani, N., Kokjohn, S., S. W. Park, Bergin, M., Munnannur, A., Ning, W., Sun, Y., and Reitz, R. D., "An Improved Spray Model for Reducing Numerical Parameter Dependencies in Diesel Engine CFD Simulations", SAE-2008-01-0970, (2008)

Sponsors

• Diesel Emissions Reduction Consortium

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