Our colleague, Marco Davidovic, recently delivered a talk on "Large-Eddy Simulations of Pollutant Formation in Compression Ignition Engines” at the "Flammentag für nachhaltige Verbrennung” conference in Berlin. This presentation focused on modeling in-cylinder soot formation using interactive non-premixed flamelet models.?In this approach, reactive scalars are solved in mixture fraction space, while the evolution of mixture fraction is modeled in physical space using a presumed Filtered Density Function (FDF) approach. Recently, the model formulation has been revised by M. Davidovic and H. Pitsch to express the transport of scalars in mixture fraction space consistently with the FDF approach using a modified beta distribution shape.?This work has received funding from the Deutsche Forschungsgemeinschaft (DFG) as part of Germany's Excellence Strategy - Exzellenzcluster 2186 "The Fuel Science Center” We also gratefully acknowledge the computing time provided at the NHR Center NHR4CES at RWTH Aachen University.

Avijit Saha successfully defended his Ph.D. thesis on "Physics-based Reduced-order Modeling of Flash-boiling Injection Processes in Internal Combustion Engines". We congratulate him on his success and wish him the best for his future.

Ahmed Hassan successfully defended his Ph.D. thesis on "Uncertainty quantification and sensitivity analysis of solid fuel combustion". We congratulate him on his success and wish him the best for his future.

A warm welcome to our new Ph.D. researcher, Mr. Patrick Hermsmeyer! He will be working on SPP 2419 "HyCAM" project, where his role is to further develop numerical combustion models and optimiation methods using machine learning and adjoint methods.

A warm welcome to our new Ph.D. researchers, Mr. Lorenzo Frascino and Ms. Aurora Maffei. They will be working on our ENCODING project which is funded by the Marie Sklodowska-Curie Actions programme.

Mr. Lorenzo Frascino will focus on the CFD modeling of the impact of hydrogen blends with methane and ammonia on complex turbulent combustion systems with different set-ups employing diluted and pre-heated combustion regimes.
 
Ms. Aurora Maffei will conduct an experimental campaign combining optical in-flame and post-combustion measurement and different sensing techniques in a partially premixed turbulent jet facility, employing hydrogen and its blends with methane and ammonia.

A warm welcome to our new Postdoctoral researcher, Dr.-Ing. Raymond Langer! He will be working on chemical kinetics, focusing on polycyclic aromatic hydrocarbons.

Hongchao Chu successfully defended his Ph.D. thesis on "Numerical Study on Hydrogen and Iso-octane Early Flame Kernel Development in Spark Ignition Engines". We congratulate him on his success and wish him the best for his future.

Check out our recently published book chapter on "Hydrogen Laminar Flames" in the book titled "Hydrogen for Future Thermal Engines".

Raymond Langer successfully defended his Ph.D. thesis on "Adjoint Sensitivity Analysis for Chemical Kinetic Model Development". We congratulate him on his success and wish him the best for his future.

Mr. Hongchao Chu and coworkers recently published an article in Combustion and Flame on "Effects of turbulence on variations in early development of hydrogen and iso-octane flame kernels under engine conditions"

Mr. Terence Lehmann recently presented his work on "Intrinsic Flame Instabilities in Ammonia/Hydrogen Flames: Analysis of Temperature and Progress Variable" at the 2nd Symposium on Ammonia Energy in Orléans

Prof. Pitsch delivered a lecture titled "Combustion Theory and Applications in CFD" at the Princeton-Combustion Institute Summer School last week.

Mr. Avijit Saha and coworkers recently published an article in International Journal of Multiphase Flow on "Dimensional analysis of vapor bubble growth considering bubble–bubble interactions in flash boiling microdroplets of highly volatile liquid electrofuels".

A warm welcome to our new visiting scholar Prof. Jie Liu from Beijing Jiaotong University. He will be working on solid material combustion during his stay at ITV.

Following posters have been presented from ITV at the recent European Combustion Meeting, April 26 - 28, 2023:

• Effects of Dilatation and Turbulence on Tangential Strain Rate of Premixed Hydrogen and Iso-Octane Flames Under Engine Conditions by Mr. Hongchao Chu and coworkers
• NH3/H2Combustion: Comprehensive Quantitative Evaluation of Chemical Kinetic Mechanisms and Improvement by Mr. Sanket Girhe and coworkers
• Intrinsic Flame Instabilities in Laminar Ammonia/Hydrogen Flames: Effects of Hydrogen-Fraction and Equivalence Ratio by Mr. Terence Lehmann and coworkers
• Development and Assessment of an Approach to Accelerate Reaction Kinetics Evaluation in CPU-based CFD Solvers through GPUs by Mr. Marco Vivenzo and coworkers
• Skeletal Mechanism for Methanol Oxidation and Nitrogen Oxides Predictions: Application to Spark-Ignition (SI) Engines by Ms. Francesca Loffredo and coworkers
• Analysis of Radiation and Buoyancy Induced Uncertainty of Ammonia Flames by Mr. Roman Glaznev and coworkers
• Experimental Laminar Flame Speed Study of Nitrogen-diluted Diethoxymethane/Oxidizer Mixtures under Microgravity by Mr. Roman Glaznev and coworkers

Mr. Avijit Saha presented his work on "A ROM for Multiphase Simulation of Transient Inert Multicomponent Sprays in the Context of Compression ignition Engines" at the 22nd Computational Fluids Conference, Cannes, France on 27th April, 2023. 

A warm welcome to our new PhD researcher, Ms. Anita Meraviglia! She will be involved in the study of the theoretical and experimental investigation on the devolatilisation and oxidation of solid-fuel particles in a counterflow burner under oxy-fuel conditions.

Mr. Kai Niemietz and Mr. Gandolfo Scialabba presented their work on prediction of gas turbine emissions at the FVV Spring Meeting on 30th of March at Würzburg.

Mr. Avijit Saha presented his work on "Lagrangian Modeling of Vapor Bubble Growth in Flash Boiling Single Droplet Considering Bubble-bubble Interactions" on 3rd April at the 11th International Conference on Multiphase Flow, Kobe Japan.

Dr.-Ing Lukas Berger left the institute in March after seven successful years. ITV expresses heartful gratitude to him for his invaluable contributions to the institute and the research in the field of combustion. We wish you all the best for your new position at MTU Aero Engines AG and the future.

The recent publicatin by Mr. Hongchao Chu and coworkers, "Effects of differential diffusion on hydrogen flame kernel development under engine conditions”, has been selected as the distinguished paper in the Turbulent Flames colloquium for the 39th International Symposium on Combustion. In this study, DNS was performed to investigate how differential diffusion affects the growth of flame kernels with an effective Lewis number far smaller than unity and if thermodiffusive instabilities appear under realistic engine conditions with elevated in-cylinder pressure and high unburned temperature. The paper is available for free download on Science Direct through the end of 2023.

Prof. Jonathan Freund from the University of Illinois Urbana-Champaign give a talk on Integrated Simulation of Composite Scramjets  (including projects in ML for turbulence and laser-induced breakdown for ignition) at 1.30 pm on 6th December in our seminar room.

Mr. Marco Davidovic and coworkers recently published an article in Proceedings of the Combustion Institute on 'Formulation and importance of conservative transport in non-premixed flamelet models'

Zwei der Artikel des 38. Combustion Symposium, die von Forschern des ITV gemeinsam verfasst wurden, wurden mit dem Distinguished Paper Award ausgezeichnet. Wir gratulieren allen Autoren dieser Artikel und den Autoren aller angesehenen Artikel zu dieser Anerkennung

1. The effect of pressure on the hydrodynamic stability limit of premixed flames by A. Attili, R. Lamioni, L. Berger, K. Kleinheinz, P.E. Lapenna, H. Pitsch, F. Creta

2. On the combined effect of internal and external intermittency in turbulent non-premixed jet flames by M. Gauding, M. Bode, D. Denker, Y. Brahami, L. Danaila, E. Varea

Der Breathing Propulsion Award wird jährlich an eine Person verliehen, welche nachhaltige und ausgezeichnete Leistungen in den Wissenschaften und Technologien von Luftatmungssystemen vollbracht hat. Herr Professor Pitsch wurde ausgezeichnet ''für richtungsweisende Beiträge zum grundlegenden Verständnis, zur Theorie und zur rechnergestützten Modellierung turbulenter Verbrennung“. Der Preis wird auf dem AIAA-Antriebs- und Energieforum am 26. August 2020 in New Orleans, USA, verliehen.

Prof. Alberto Cuoci von der Politecnico di Milano (Italien) hat das Humboldt-Forschungsstipendium für erfahrene Wissenschaftler erhalten um als Teil der Forschungsgruppe von Professor Pitsch am ITV für einen Zeitraum von 18 Monaten zu arbeiten. Das Forschungsprojekt thematisiert die Entwicklung fortschrittlicher mathematischer Modelle, die auf der Kopplung detaillierter Chemie und maschineller Lernalgorithmen basieren, um die Bildung, Entwicklung und Morphologie kohlenstoffhaltiger Partikel aus Verbrennungsprozessen zu beschreiben.