Researcher: Sage Kokjohn

Areas of Research Expertise
  • Energy efficiency
  • Biomechanics
  • Robotics
  • Manufacturing
  • Controls
  • Engines
  • Solar energy
  • Power electronics
  • Design
  • Optimization
  • High efficiency energy conversion
  • Thermodynamics and fluid mechanics
  • Turbulent combustion modelling
Web Site Sage Kokjohn's Department of Mechanical Engineering Website
Curriculum Vitae (CV)
Current/Active Funding
  • DOD, Navy, 2014-2017, Reducing naval IC engine fuel consumption using reformed-fuel reactivity controlled compression ignition (RCCI) combustion
  • UT-Battelle, LLC, 2014-2016, Technical advising on materials needs for increased peak cylinder pressure
  • Caterpillar, Inc, 2015-2016, Modeling of advanced combustion
  • Caterpillar, Inc, 2015-2016, Advanced combustion, engine experiments
  • Wisconsin Engine Research Consultants, L, 2015-2018, Spark-assisted HCCI residential CHP
  • DOE, National Energy Technology Laborato, 2016-2016, Development and validation of an improved soot model considering a stochastic solution to the population balance equations
  • Ford Motor Company, 2015-2017, 2014-2185 URP award: enabling predictive modeling of DISI cold start emissions
  • Oak Ridge National Laboratory, 2016-2016, Computational fluid dynamics modeling of reactivity controlled compression ignition combustion
Issued Patent(s)
  • 9,376,955 - Engine combustion control via fuel reactivity stratification, issued June 2016.
  • 9,080,501 - Engine combustion control via fuel reactivity stratification, issued July 2015.
  • 9,057,321 - Fuel reactivity stratification in rotary diesel engines, issued June 2015.
  • 8,851,045 - Engine combustion control at low loads via fuel reactivity stratification, issued October 2014.
  • 8,616,177 - Engine combustion control via fuel reactivity stratification, issued December 2013.
USPTO Published Applications
  • 20150292391 - Engine combustion control via fuel reactivity stratification, published October 2015.
  • 20140102406 - Engine combustion control via fuel reactivity stratification, published April 2014.
  • 20110192367 - Engine combustion control via fuel reactivity stratification, published August 2011.
Recent Publication(s)
  • Development and validation of a reduced reaction mechanism with a focus on diesel fuel/syngas co-oxidation. Ra Y, Chuahy F, Kokjohn S. Fuel. 2016 Dec 1;185(1):663-683. doi: 10.1016/j.fuel.2016.07.039.

  • Thermodynamic energy and exergy analysis of three different engine combustion regimes. Li Y, Jia M, Chang Y, Kokjohn SL, Reitz RD. Applied Energy. 2016 Oct 15;180(1):849-858. doi: 10.1016/j.apenergy.2016.08.038.

  • The development of an ignition delay correlation for PRF fuel blends from PRF0 (n-Heptane) to PRF100 (iso-octane). Delvescovo D, Kokjohn S, Reitz R. Sae international Journal of Engines. 2016 Apr 5;9(1):520-535. doi: 10.4271/2016-01-0551.

  • Investigation of the effect of injection and control strategies on combustion instability in reactivity-controlled compression ignition engines. Klos DT, Kokjohn SL. Journal of Engineering for Gas Turbines and Power. 2016 Jan 1;138(1):011502. doi: 10.1115/1.4031179.

View Sage Kokjohn's publications at Google Scholar.
Recent Artistic Works
  • Lund University, Energy Sciences
  • Oak Ridge National Laboratory
  • Sandia National Laboratories
Research Tools
Research Facilities
E-mail Address [email protected]
Phone Number 608-263-1610
Current University UW–Madison
Department Mechanical Engineering
Title Assistant Professor
Other Appointments
Address Line 1 1018 Engineering Research Building
Address Line 2 1500 Engineering Drive
City Madison
State WI
Zip Code 53706
Bachelor's Degree B.S., Iowa State University, 2006
Master's Degree M.S., UW–Madison, 2008
PhD Ph.D., UW–Madison, 2012
Other Degrees
Technologies Available for Licensing Fuel Reactivity Method Cuts Diesel Engine Emissions

Engine Combustion Control at Low Loads with Reactivity Controlled Compression Ignition Combustion

Improved Compression Ignition Combustion in Rotary Engines for Higher Efficiency and Lower Pollutant Emissions

RCCI – A Clean Compression Engine Combustion Process for High Fuel Efficiency and Low Emissions