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, 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