Plenary Lectures
Plenary Lectures
Monday, July 24, 09:00-10:00
Venkat Raman
Dept. of Aerospace Engineering, University of Michigan
Progress in the Computational Modeling and Understanding of Gaseous and Liquid-fueled Detonation Engines
Detonation engines, using continuous spinning or rotating waves, are finding use in a broad spectrum of propulsion applications. While research in this area span more than five decades, details of the complex detonation process have been emerging only in the last couple of decades. Such engines involve the three-dimensional interplay of flow geometry and unsteady fuel/air injection, stratified mixtures, and complex wave dynamics including multiple and even counter-propagating structures. Due to the multiscale nature of these problems, computational modeling using even the most powerful computing systems still remains a challenge. In this talk, progress in the detailed representation of single and two-phase detonation configurations, insights learnt, and key challenges are discussed. 
Tuesday, July 25, 09:00-10:00
Nabiha Chaumeix
Director of R&D at CNRS, France

Role of the Chemical Kinetics on the Assessment of Explosions an Their Mitigation
Thursday, July 27, 09:00-10:00
Kaoru Maruta
Director, Institute of Fluid Science, Tohoku University
Combustion Fundamentals for Future Hyper Lean Burn Spark Ignition Engine Applications: Effects of fuel properties on lean ignition limits and knock onset
After the achievements of SIP “Innovative combustion” project (2014-2019), its successor project (2019-present) is underway in Japan to improve the efficiency of SI engines using lean combustion technology. Several Japanese automakers and universities were collaborating in the former project that achieved a net thermal efficiency of 51.5%, and in the current project the aim is to achieve a net thermal efficiency 60% in the near future. In this presentation, we will report the results of the investigation of two topics directly related to the final engine efficiency, (1) lean ignition limit and (2) knock onset condition, using basic combustion methodologies without using engines, and based on various engine test data released by the project and other related organizations. First, a brief overview of the above projects will be presented, followed by our results of turbulent ignition experiments and numerical analysis on the mechanism of lean ignition limit and its dependence on fuel characteristics. Then, the results of the study on the influence of fuel characteristics on the knock onset condition will be presented, combining our DNS for a published experiment and our theoretical and numerical considerations.