Kopplung einer Direkt Quadratisch-basierten Sektion-Momenten-Methode (DQbSMOM) mit Large Eddy Simulation (LES) zur Beschreibung von polydispersen reagierenden Spraysystemen

• Antragsteller: Professor Dr. Amsini Sadiki
• Fachliche Zuordnung: Energieverfahrenstechnik ; Strömungsmechanik
• Förderung: Förderung von 2019 bis 2023
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 427460734

• Erstellungsjahr: 2024

Zusammenfassung der Projektergebnisse

This work used the large eddy simulation (LES) approach and further developed LES to investigate turbulent spray combustion systems. Beside the development of an interface to efficiently apply chemistry tabulation strategies within the open source code OpenFOAM, this project implemented and investigated two different approaches to model the interaction of the turbulence and chemistry: the artificially thickened flame model and the Transported filtered probability density function according to the Eulerian stochastic field method. The WALE Subgrid Scale (SGS) model was used to describe the SGS structures of the turbulent fluid flow. Based on this LES plateform, this project aimed at the development, implementation, verification, validation and evaluation of an advanced Euler-Euler method in which the evaporating droplets are tracked using an Eulerian methodology, such as the direct quadrature-based sectional moment method (DQbSMOM). Thereby coalescence process as well as droplet-droplet interactions had to be modelled. During the first steps of adapting the available RANS-based tool to LES framework, the preliminary tests with some existing breakup and coalescence kernels revealed that various different formulations yield significantly different results. A thermodynamically rational treatment appeared compelling while being associated with complex and burdensome modelling efforts. Since this might modify strongly the main direction of the project, the applicant undertook therefore to improve the concept in order to enhance the quality of the outcome while ensuring the simplicity of the modelling. He then included the in-nozzle flow along with an interface tracking algorithm that allows to better capture the whole liquid atomisation which governs all the subsequent processes. In this respect, the primary and secondary breakup are naturally captured without particular modelling. This results in a LES-based Volume of Fluid (VOF) method that replaces not only the DQb-SMOM method coupled to the E-MMF as proposed, but also the previously suggested MMEF formalism associated with high modelling efforts. In addition, the Euler Multi-Size Moment (EMSM) approach became unnecessary allowing to save modelling expenses and computational costs. To track the generated polydispersed particles/droples three approaches have been adopted: (a) the pure LES-based VOF; (b) a full T-FDF coupled with a Lagrangian particle tracking (LPT); (c) a novel seamless coupling technique of the LES-based VOF with the LPT including phase change modelled in both VOF and LPT. Focusing on the tabulated chemistry, the FG-based tabulation approach has been improved by integrating two specific features: (1) the presence of heat loss during droplet evaporation, (2) the essential properties for the evaluation of irreversibilities in combustion systems through the entropy generation analysis (EGA) approach. Two classes of configurations have been selected for model validation. The Sandia Flames D, E, F and a SCR-configuration were used especially for the evaluation of the EGA. Three configurations were utilized to validate the modelling suggested. These are (a) CORIA Rouen swirled Spray Burner (CRSB) system which is one of the target configurations of the “Turbulent Spray Combustion (TCS)” workshop; (b) Liquid jet in hot cross-flow as experimentally investigated by Shaw et al. (2022); and (c) Single droplets of Hexane and Decane, respectively. Owing to the improvement of the concept of this project, all the objectives have been successfully achieved.

Projektbezogene Publikationen (Auswahl)

• Analysis of Local Exergy Losses in Combustion Systems Using a Hybrid Filtered Eulerian Stochastic Field Coupled with Detailed Chemistry Tabulation: Cases of Flames D and E. Energies, 14(19), 6315.
  Agrebi, Senda; Dreßler, Louis; Nicolai, Hendrik; Ries, Florian; Nishad, Kaushal & Sadiki, Amsini
  
• Numerical Prediction of Turbulent Spray Flame Characteristics Using the Filtered Eulerian Stochastic Field Approach Coupled to Tabulated Chemistry. Fluids, 6(2), 50.
  Dressler, Louis; Sacomano, Filho Fernando Luiz; Ries, Florian; Nicolai, Hendrik; Janicka, Johannes & Sadiki, Amsini
  
• Entropy Generation Analysis in Turbulent Reacting Flows and Near Wall: A Review. Entropy, 24(8), 1099.
  Sadiki, Amsini; Agrebi, Senda & Ries, Florian
  
• Experimental Study for Selective Reduction of NOx from Diesel Engine Exhaust Gases at Low Temperature Using Activated Carbon. Water, Air, & Soil Pollution, 233(8).
  Hamdi, Fathi; Nouri, Hanen; Labiadh, Zeineb; Agrebi, Senda; Chrigui, Mouldi & Sadiki, Amsini
  
• Impact of Multi-Component Surrogates on the Performances, Pollutants, and Exergy of IC Engines. Entropy, 24(5), 671.
  Mondo, Kambale; Agrebi, Senda; Hamdi, Fathi; Lakhal, Fatma; Sadiki, Amsini & Chrigui, Mouldi
  
• Impact of Spray Cone Angle on the Performances of Methane/Diesel RCCI Engine Combustion under Low Load Operating Conditions. Entropy, 24(5), 650.
  Hamdi, Fathi; Agrebi, Senda; Idrissi, Mohamed Salah; Mondo, Kambale; Labiadh, Zeineb; Sadiki, Amsini & Chrigui, Mouldi
  
• Investigation of Liquid Atomization in a Pressure-swirl Atomizer using Realtime Coupled Volume of Fluid and Lagrangian Particle Tracking Methods within Large Eddy Simulation Framework, (Conference: 31th Conference on Liquid Atomization and Spray Systems, ILASS-Europe 2022 At: Tel-Aviv, Israel.
  Sun, Yaquan; Clavel, Marie-Eve; Dreßler, Louis; Li, Yongxiang; Nishad, Kaushal; Cabot, Gilles; Renou, Bruno & Sadiki, Amsini
  
• Investigation of Spray in Cross-flow using Automatic Coupled Volume of Fluid and Lagrangian Particle Tracking within Large Eddy Simulation Framework (Conference: 22nd Annual Conference on Liquid Atomization and Spray Systems, ILASS- ASIA-2022 At: Indore, INDIA)
  Sun, Yaquan; Nishad, Kaushal; Li, Yongxiang; Dreßler, Louis & Sadiki, Amsini
  
• Numerical Investigation of Atomization Characteristics of Ad- Blue Injection in SCR-DeNOx system using VOF-LES (Conference: 22nd Annual Conference on Liquid Atomization and Spray Systems, ILASS-ASIA-2022 At: Indore, India)
  Nishad, Kaushal; Sun, Yaquan; Li, Yongxiang; Hasse, Christian & Sadiki, Amsini
  
• Analysis of entropy generation in Sandia flame F using a hybrid flitered Eulerian stochastic field coupled with detailed chemistry tabulation, (Twelfth Mediterranean Combustion Symposium, 23 - 26 January 2023, Luxor -Egypt
  Agrebi, Senda & Sadiki, Amsini
  
• Estimation of Entropy Generation in a SCR-DeNOx System with AdBlue Spray Dynamic Using Large Eddy Simulation. Entropy, 25(3), 475.
  Nishad, Kaushal & Agrebi, Senda
  
• Multiscale numerical modeling of a complete spray evolution including breakup of liquid jet injection in gaseous cross flow. International Journal of Multiphase Flow, 170, 104655.
  Sun, Yaquan; Li, Yongxiang; Dreßler, Louis; Nishad, Kaushal & Sadiki, Amsini