Combustion Chemistry and Modeling, Henry Curran, Day 4 Part 1

Value of the Information & Strength of the Argument

The lecture provides valuable insights into the state-of-the-art in combustion kinetics, emphasizing the critical role of accurate potential energy surfaces and rate constants. Curran’s argumentation is solid, supported by specific examples and references to key studies. He effectively demonstrates the evolution of mechanisms and the impact of computational advances. The discussion on the trade-offs between hand and computer optimization is particularly instructive, highlighting the benefits of automated approaches while acknowledging the need for human understanding.

The title accurately reflects the content: a lecture on combustion chemistry and modeling, part of a summer school series.

8/10

Lecture by a leading expert in combustion kinetics, based on established scientific literature and computational methods. The content is rigorous and well-referenced, though it lacks formal peer review and includes some informal asides.

Markers derived by PSI from the transcript: the creator did not define chapters.

• 00:00Introduction and recap of previous lecture, emphasizing the importance of continuous mechanism development.
• 02:00Discussion on the acetylene + HO2 reaction and the need for potential energy surface analysis.
• 05:00Example of vinyl + O2 reaction, historical experiments, and low-temperature pathways.
• 10:00Overview of automated codes for rate constant calculation: Kinbot, ES-TTP, AutoTST.
• 15:00Comparison of hand-optimized vs computer-optimized mechanisms, showing lower uncertainties with computer optimization.
• 20:00List of common mechanisms (GRI-Mech, AramcoMech, etc.) and databases for rate constants.
• 30:00Discussion on the growth of mechanism size with molecular size, linked to Moore's law.
• 40:00Explanation of high-temperature competition between unimolecular decomposition and bimolecular oxidation using n-heptane example.

• Kinbot — Automated code for exploring potential energy surfaces, developed at Sandia National Laboratories.
• ES-TTP — Electronic structure to rate constants as a function of temperature and pressure, developed by Steven Klippenstein and Carlo Cavallotti.
• AutoTST — Automated transition state theory calculations for high-throughput kinetics, from Richard West's group.
• PrIME — Process Informatics Model, a database for chemical kinetic data.
• CloudFlame — Web-based platform for combustion mechanism development and analysis.
• ReSpecTh — ReSpecTh database for chemical kinetic data, maintained by Tamas Turanyi's group.
• AramcoMech — Detailed chemical kinetic mechanism for combustion, developed at NUI Galway.
• GRI-Mech — Optimized mechanism for natural gas combustion, widely used in industry.

• Combustion Chemistry — General background on combustion chemistry.
• Chemical kinetics — Overview of chemical kinetics principles.