Experimental investigation of droplet evaporation under extreme conditions by temporally highly resolved laser diagnostic methods
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The injection of a fluid in a supercritical environment has great potential to improve energetic processes, such as the reduction of fuel in engine combustion processes or control of combustion instabilities. The specific use of supercritical injection in industrial processes is currently complicated due to the lack of knowlegde of the physical processes. This mainly regards the break-up, the "evaporation" as well as the mixing of a fluid at the transfer from subcritical to supercritical conditions (evaporation requires an interface, which doesn’t exist near supercritical conditions; hence, the term “evaporation” is used in this context to describe the transition of a fluid). Only very few detailed experimental investigations, that are essential for model development and validation, have been conducted so far.
The goal of this subproject in the first period is to run extensive experimental studies of evaporation and mixing processes with isolated droplets that are injected into a supercritical or near-supercritical environment. Based on these data the mathematical multiple regime modeling of physical processes shall be improved throughout the SFB-TRR75. This leads to precise pre-defined boundaries of the experiments. As opposed to spray experiments - which are scheduled for follwing periods - reproducible boundary conditions can be defined clearly for isolated droplets. The droplets are placed in an optically accessible chamber under high pressure and high temperature. Measurement methods will be improved and will be used to make a quantitative and precise determination possible. This includes determination of droplet morphology, size, speed, mixture with the surrounding gas phase and transition from lower to supercritical conditions. In summary the goals are to describe the temporal evolution of a droplet during its transition into a supercritical state experimentally and to provide data for the validation of a mathematical multiple regime model; thus, to create the basis for future innovative fuel injection technology.
The methodical challenges of this project at first is to build a test bench which enables the controlled injection of single droplets or droplet chains into a gas environment, where pressure and temperature levels can be varied up to the supercritical conditions of the injected fluid. Furthermore, there are only a few methods that have potential to investigate the transition of an initially liquid droplet in a supercritical state and the mixing processes with the surrounding gas phase. In this project various optical methods are tested regarding their suitability of these measurement tasks. After that they are applied as a model system to investigate the evolution of acetone drops introduced in an O2/N2 environment. In the course of this the ambient conditions are set up to the supercritical range of acetone (pkrit~48±4bar, Tkrit~508±2K) with a variable O2 concentration. Based on this information sprays up to supercritical conditions will be examined in upcoming periods.
The complexity of this task requires a very extensive expertise in various sections. Therefore there are two subproject managers with different interdisciplinary skills. Only the distribution between the locations Stuttgart and Darmstadt allows such extensive experimental characterizations. In addition, the distributed project management contributes to an even closer networking. This project is also responsible for the coordination of all measurement methods applied in the Transregio.
Non-invasive thermometry and wake mixture fraction determination of evaporating droplets at elevated pressures using laser spectroscopy.
Dissertation, Technische Universität Darmstadt, 2021
Steinhausen, C., Gerber, V., Preusche, A., Weigand, B., Dreizler, A., Lamanna, G.:
On the potential and challenges of laser-induced thermal acoustics for experimental investigation of macroscopic fluid phenomena.
Experiments in Fluids, 62(2), Article 2, 2021.
Stierle, R., Waibel, C., Gross, J., Steinhausen, C., Weigand, B., Lamanna, G.:
On the Selection of Boundary Conditions for Droplet Evaporation and Condensation at high Pressure and Temperature Conditions from interfacial Transport Resistivities.
International Journal of Heat and Mass Transfer, 151, 119450, 2020.
Lamanna, G., Steinhausen, C., Weckenmann, F., Weigand, B., Bork, B., Preusche, A., Dreizler, A., Stierle, R., Gross, J.:
Laboratory Experiments of High-Pressure Fluid Drops: Chapter 2.
American Institute of Aeronautics and Astronautics (Hg.) -- High-Pressure Flows for Propulsion Applications, 49--109, 2020.
Preusche, A., Dreizler, A., Steinhausen, C., Lamanna, G., Stierle, R.:
Non-invasive, spatially averaged temperature measurements of falling acetone droplets in nitrogen atmosphere at elevated pressures and temperatures.
The Journal of Supercritical Fluids, 166, 105025, 2020.
Steinhausen, C., Lamanna, G., Weigand, B., Stierle, R., Gross, J., Preusche, A., Dreizler, A., Sierra-Pallares, J.:
On the influence of evaporation on the mixture formation of high pressure combustion.
Proceedings ICMF 2019, 10th International Conference on Multiphase Flow: May 19 -- 24, 2019, Rio de Janeiro, Brazil, 2019.
Steinhausen, C., Reutzsch, J., Lamanna, G., Weigand, B., Stierle, R., Gross, J., Preusche, A., Dreizler, A.:
Droplet Evaporation under High Pressure and Temperature Conditions: A Comparison of Droplet Evaporation under High Pressure and Temperature Conditions.
Proceedings ILASS--Europe 2019, 29th Conference on Liquid Atomization and Spray Systems: 2-4 September 2019, Paris, France, 2019.
Experimental Investigations of Isolated Fluid Particles under Extreme Conditions.
Dissertation, Universität Stuttgart, 2019
Average Temperature Approximation of Evaporating Falling Acetone Drops Using UV Fluorescence-Phosphorescence Response
2019 Laser Diagnostics in Energy and Combustion Science June 23, 2019 - June 28
2019 Les Diablerets Conference Center in Les Diablerets Switzerland
Ouedraogo, Y., Gjonaj, E., Weiland, T., de Gersem, H., Steinhausen, C., Lamanna, G., Weigand, B., Preusche, A., Dreizler, A.:
Modelling and Simulation of Electrically Controlled Droplet Dynamics.
In U. Langer, W. Amrhein, & W. Zulehner (Hrsg.), Scientific Computing in Electrical Engineering (Bd. 28, S. 101--109).
Springer International Publishing, 2018.
Lamanna, G., Steinhausen, C., Weigand, B., Preusche, A., Bork, B., Dreizler, A., Stierle, R., Gross, J.:
On the importance of non-equilibrium models for describing the coupling of heat and mass transfer at high pressure.
International Communications in Heat and Mass Transfer, 98, 49--58, 2018.
Palmetshofer, P., Steinhausen, C., Preusche, A., Dreizler, A., Weigand, B., Lamanna, G.:
Comparison of diffusion models for application in low- to high-pressure droplet evaporation problems.
Proceedings ICLASS 2018, 14th Triennial International Conference on Liquid Atomization and Spray Systems: July 22-26 2018, Chicago, IL, USA, 2018.
Bork, B., Preusche, A., Weckenmann, F., Lamanna, G., Dreizler, A.:
Measurement of species concentration and estimation of temperature in the wake of evaporating n-heptane droplets at transcritical conditions.
Proc. of the Comb. Inst., 36: 2433–2440, 2017.
Ouedraogo, Y., Gjonaj, E., Weiland, A., Steinhausen, C., Lamanna, G., Weigand, B., Preusche, A., Dreizler, A.:
Electrohydrodynamic simulation of electrically controlled droplet generation.
Int. J. of Heat and Fluid Flow, 64: 120–128, 2017.
Steinhausen, C., Lamanna, G., Weigand, B., Stierle, R., Groß, J., Preusche, A., Dreizler, A.:
Experimental Investigation of Droplet Injections in the Vicinity of the Critical Point: A comparison of different model approaches.
28th Conference on Liquid Atomization and Spray Systems, Valencia, Spain, 2017.
G. Lamanna, H. Kamoun, B. Weigand, Dr. C. Manfletti, Dipl.-Ing. A. Rees, Dr. J. Sender, Prof. M. Oschwald, Dr. J. Steelant,
Flashing behaviour of rocket engines propellants.
Atomization and Sprays, Vol. 25, No. 10, pp. 837–856, 2015
Tropfenverdampfung in transkritischer Umgebung: Untersuchung mit laserspektroskopischen Methoden.
Dissertation, Technische Universität Darmstadt, 2015.
F. Weckenmann, G. Lamanna, B. Weigand, Dipl.-Ing. Benjamin Bork, Prof. Dr. rer. nat. Andreas Dreizler
Experimental Investigation of Droplet Injections in the Vicinity of the Critical Point
14th European Meeting on Supercritical Fluids, Marseille, 2014
Bork, Benjamin ; König, T. ; Weckermann, F. ; Lamanna, G. ; Dreizler, Andreas ; Weigand, Bernhard
Thermometry of evaporating acetone droplets in near-critical conditions by combined phosphorescence/fluorescence measurements
10th Intl. Conference series on Laser-Light and Interactions with Particles, Marseille, France, 2014
B. Bork, F. Stritzke, F. Weckenmann, G. Lamanna, B. Weigand, A. Dreizler:
Acetone Photophysics Investigations for the Application of PLIFP to Droplet Evaporation Measurements under Supercritical Conditions.
ILASS–Europe, 25th European Conference on Liquid Atomization and Spray Systems, Chania, Greece, 1-4 September, 2013
Oldenhof, E.; Weckenmann, F.; Lamanna, G.; Weigand, B.; Bork, B.; Dreizler, A.:
Experimental investigation of isolated acetone droplets at ambient and near-critical conditions, injected in a nitrogen atmosphere.
Progress in Propulsion Physics 4 (2013), 257-270, (eds.: L.T. DeLuca, C. Bonnal, O. Haidn and S.M. Frolov), EDP Sciences, Torus Press
G. Lamanna, H. Kamoun, B. Arnold, K. Schlottke, B. Weigand, J. Steelant:
Differential infrared thermography (DIT) in a flashing jet: a feasibility study
QIRT J. 10(1) 2013, 112-131. DOI: 10.1080/17686733.2013.786903
Brübach, J., Pflitsch, C., Dreizler, A., Atakan, B.;
On surface temperature measurements with thermographic phosphors
Prog. Energy Combust. Sci. 39 (2013), 37-60
B. Bork, F. Weckenmann, G. Lamanna, B. Weigand, B. Böhm, A. Dreizler
Droplet studies at conditions near the critical point.
Spray 2012, Berlin, 21.-22. Mai 2012, 2012
Weckenmann, F.; Bork, B.; Oldenhof, E.; Lamanna, G.; Weigand, B.; Böhm, B.; Dreizler, A.
Single Acetone Droplets at Supercritical Pressure: Droplet Generation and Characterization of PLIFP.
Zeitschrift für Physikalische Chemie, 225 (11-12) pp. 1417-1431, 2011
G. Lamanna, H. Sun, M. Schüler, B. Weigand, D. Magatti, F. Ferri
Comparative study of equilibrium and non-equilibrium evaporation models for vaporizing droplet arrays at high pressure.
Advanced Combustion and Aerothermal Technologies: Environmental Protection and Pollution Reduction, Nick Syred (ed.), Springer Verlag, 2006