Basic Research Needs for Clean and Efficient Combustion of 21 st Century Transportation Fuels A DOE/Office of Science BES Workshop Andy McIlroy, Co-chair.

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Basic Research Needs for Clean and Efficient Combustion of 21 st Century Transportation Fuels A DOE/Office of Science BES Workshop Andy McIlroy, Co-chair Combustion Research Facility Sandia National Laboratories

p. 2 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007 Transportation Combustion Challenges  Efficiency & cleanliness difficult to achieve together  Diesels are efficient, but difficult to make clean  No throttling losses  High compression ratios  Continuum of rich to lean  Soot and NOx often anti-correlated  Spark ignited engines are ‘clean’, but less efficient  Stoichiometric burning  Little soot, 3-way catalyst eliminate NOx  Throttle losses  Low compression ratios Temperature [K] Local equivalence ratio Soot limit Soot NO X Akihama et. al 2001 SAE Fuel rich Fuel lean Diesel Spark

p. 3 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007 Motivation: Transportation Sector Key to Energy Use  Transportation accounts for ~1/3 of energy use  When electricity generation factored out, transportation dominates  Demand projected to increase  97% of transportation energy from petroleum  Relatively small number of technologies employed  Transportation sector energy use can impact national security and environmental impacts

p. 4 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007  Fuel streams are rapidly evolving  Heavy hydrocarbons  Oil sands  Oil shale  Coal  New renewable fuel sources  Ethanol  Biodiesel  New engine technologies  Direct Injection (DI)  Homogeneous Charge Compression Ignition (HCCI)  Low-temperature combustion Motivation: Changing World of Fuels and Engines

p. 5 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007 Charge to Workshop  To explore basic research needs in the areas of gas-phase chemistry, combustion diagnostics and combustion simulation that will enable the use of transportation fuels derived from non-traditional sources in a manner that optimizes engine efficiency and minimizes pollutant formation.  Non-traditional fuels are defined as those derived from carbon- neutral, renewable resources, such as biodiesel or ethanol, and those derived from non-traditional fossil fuel reserves, such as heavy crude oil, tar sands, oil shale and coal.  The output of the workshop will seek to define a set of basic, primary research directions (PRDs) that would employ and expand the current broad expertise base in gas-phase chemistry and combustion research into the realm of non- traditional fuels. Workshop participants expanded scope to include heterogeneous processes

p. 6 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007 Workshop Panels Novel CombustionFuel UtilizationCrosscut Science

p. 7 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007 Organizing committee  Co-Chairs:  Andy McIlroy, SNL  Greg McRae, MIT  Panel Leads  Novel Combustion  Dennis Siebers, SNL  Volker Sick, U. Mich.  Fuel Utilization  Phil Smith, U. Utah  Charlie Westbrook, LLNL  Crosscut Science  Craig Taatjes, SNL  Arnaud Trouve, U. MD  Al Wagner, ANL DOE/BES Eric Rohlfing Frank Tully Dick Hilderbrandt

p. 8 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007 Participants 39% Lab 42% University 12% Government 7% Industry  Total of 95 participants  Plenary Speakers  James Eberhardt, EERE  Charlie Westbrook, LLNL  Hukam Mongia, GE  David Greene, ORNL

p. 9 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007 Process From a panel lead - “If I’d known what I was getting into, I’d have said ‘NO’.”  Plenary talks  EERE perspective (Eberhardt – EE/RE)  Industry Perspective (Mongia – GE Turbines)  Science Challenges (Westbrook- LLNL)  Economic Effects (Greene - ORNL)  Panel breakouts  Panel report out  Meeting of core writing group  Final report preparation following workshop  Draft report delivered 2/21/07 to BES  Report out at February July BESAC We are here }

p. 10 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007 Priority Research Directions Identified 1.Combustion Under Extreme Pressure 2.Understand And Exploit Surface Chemistry In Transportation Systems 3.Breakthrough Discovery Tools 4.Multiscale Modeling 5.Basic Research Needs for Smart Engines 6.Physical and Chemical Properties for Combustion of 21 st Century Transportation Fuels 7.Automated Discovery Of Fuel Chemistry Kinetics 8.Spray Dynamics and Chemistry for New Fuels

p. 11 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007 Grand Challenge: Predictive Modeling of Combustion in a Evolving Fuel Environment  Predictive modeling is the key to combustion optimization in a non-linear parameter space  Challenges:  9 orders of magnitude in space and time  Complex chemistry, varying with fuel evolution  Work needed in:  Chemical mechanism development  Turbulence-chemistry interaction  Algorithm development  Large dataset analysis

p. 12 Basic research needs for Clean and Efficient Combustion of 21st Century Transportation Fuels BESAC Report July 31, 2007 Highlighted Additional Challenges  New engines demand high pressure chemistry and physics  Need to understand processes at up and beyond 100 atm  Essentially no quantitative, species specific diagnostics  Are binary collision models relevant at these pressures?  Novel fuel/engine cycle combinations require understanding interfacial and condensed phase phenomena  Fuel jet evolution not understood, but critical  Soot creation/destruction poorly understood  Additional heteroatoms of alternative fuels complicates  Wall processes ignored in present models  Evolving Fuels increase chemical complexity  Reaction sets run into 1000’s of reactions  Mechanisms and rates are largely unknown for new fuels (or old)  Combustion device models are limited by chemical complexity

Technology Maturation & Deployment Applied Research Reaction chemistry of large molecules at high pressure Heterogeneous combustion and soot chemistry Turbulent reacting flows with a large range of chemical time scales Liquid fuel spray chemistry and dynamics Multi-scale modeling: from quantum to continuum High-fidelity computational approaches (DNS, LES) 4-D diagnostics at high pressure and under multi- phase conditions Automatic generation & reduction of chemical kinetics models of 21 st Century Fuels Soot formation, composition, morphology, oxidation and atmospheric evolution High-fidelity CFD for complex and deformable engine geometries Elucidating combustion dynamics for control strategies Uncertainty quantification in multi- scale modeling Development of novel diagnostics for molecular characterization at high pressure Data and simulation framework built upon collaboratory and cyber- infrastructure tools Modeling of turbulent sprays and turbulent multi-mode combustion Discovery Research Use-inspired Basic Research High-fidelity CFD for device scale research: Virtual Engine Simulators (VES) Application of VES to engine design, optimization, and real-time control High-resolution optical diagnostics for device scale research Device scale research on the impact of alternative fuel properties on novel combustion and emission processes Exploration of high pressure engine combustion Joint optimization of alternative fuel formulation and engine design Smart vehicle strategies and sensor development Office of Science BES Applied Energy Offices EERE New generation of vehicles with alternative fuels: achieving high efficiencies with emission compliance Enable realization of next- generation efficiency and emissions standards Smart vehicles with VES- based control systems Combustion Science for 21 st Century Fuels and Engines