@misc{SeidelMoshammerWangetal., author = {Seidel, Lars and Moshammer, Kai and Wang, Xiaoxiao and Zeuch, Thomas and Kohse-H{\"o}inghaus, Katharina and Mauß, Fabian}, title = {Comprehensive kinetic modeling and experimental study of a fuel-rich, premixed n-heptane flame}, series = {Combustion and Flame}, volume = {162}, journal = {Combustion and Flame}, number = {5}, issn = {0010-2180}, doi = {10.1016/j.combustflame.2015.01.002}, pages = {2045 -- 2058}, abstract = {An existing comprehensive kinetic hydrocarbon oxidation model has been augmented and revised for a detailed analysis of n-heptane flame chemistry. The analysis was enabled by experiments in which the detailed species composition in a fuel-rich flat premixed (ϕ=1.69) n-heptane flame at 40mbar has been studied by flame-sampling molecular-beam mass spectrometry using electron impact ionization. Mole fraction profiles of more than 80 different species have been measured and compared against the new detailed kinetic model consisting of 349 species and 3686 elementary reactions. For all major products and most of the minor intermediates, a good agreement of the modeling results with the experimentally-observed mole fraction profiles has been found. The presence of low- and intermediate-temperature chemistry close to the burner surface was consistently observed in the experiment and the simulation. With the same kinetic model, n-heptane auto-ignition timing, flame speeds and species composition in a jet-stirred reactor have been successfully simulated for a broad range of temperatures (500-2000K) and pressures (1-40bar). The comprehensive nature and wide applicability of the new model were further demonstrated by the examination of various target experiments for other C1 to C7 fuels.}, language = {en} } @misc{PasternakMaussXavieretal., author = {Pasternak, Michal and Mauß, Fabian and Xavier, Fabio and Riess, Michael and Sens, Marc and Benz, Andreas}, title = {0D/3D Simulations of Combustion in Gasoline Engines Operated with Multiple Spark Plug Technology}, series = {SAE Technical Papers}, journal = {SAE Technical Papers}, number = {2015-01-1243}, issn = {0148-7191}, doi = {10.4271/2015-01-1243}, abstract = {A simulation method is presented for the analysis of combustion in spark ignition (SI) engines operated at elevated exhaust gas recirculation (EGR) level and employing multiple spark plug technology. The modeling is based on a zero-dimensional (0D) stochastic reactor model for SI engines (SI-SRM). The model is built on a probability density function (PDF) approach for turbulent reactive flows that enables for detailed chemistry consideration. Calculations were carried out for one, two, and three spark plugs. Capability of the SI-SRM to simulate engines with multiple spark plug (multiple ignitions) systems has been verified by comparison to the results from a three-dimensional (3D) computational fluid dynamics (CFD) model. Numerical simulations were carried for part load operating points with 12.5\%, 20\%, and 25\% of EGR. At high load, the engine was operated at knock limit with 0\%, and 20\% of EGR and different inlet valve closure timing. The quasi-3D treatment of combustion chamber geometry and the spherical flame propagation by the 0D SI-SRM enabled for estimating the impact of number of spark plugs on the combustion progress and the risk of knock occurrence. Application of three spark plugs shortened significantly the combustion process. When the engine was operated at knock limit and with 20\% EGR, combustion duration was similar to that of engine operation without EGR and with one spark plug. Overall, the results presented demonstrate that this method has the potential to support early stages of engine development with limited experimental data available.}, language = {en} } @misc{MatriscianoBorgPerlmanetal., author = {Matrisciano, Andrea and Borg, Anders and Perlman, Cathleen and Lehtiniemi, Harry and Pasternak, Michal and Mauß, Fabian}, title = {Soot Source Term Tabulation Strategy for Diesel Engine Simulations with SRM}, series = {SAE Technical Papers}, journal = {SAE Technical Papers}, number = {2015-24-2400}, issn = {0148-7191}, doi = {10.4271/2015-24-2400}, pages = {1 -- 15}, abstract = {In this work a soot source term tabulation strategy for soot predictions under Diesel engine conditions within the zero-dimensional Direct Injection Stochastic Reactor Model (DI-SRM) framework is presented. The DI-SRM accounts for detailed chemistry, in-homogeneities in the combustion chamber and turbulence-chemistry interactions. The existing implementation [1] was extended with a framework facilitating the use of tabulated soot source terms. The implementation allows now for using soot source terms provided by an online chemistry calculation, and for the use of a pre-calculated flamelet soot source term library. Diesel engine calculations were performed using the same detailed kinetic soot model in both configurations. The chemical mechanism for n-heptane used in this work is taken from Zeuch et al. [2] and consists of 121 species and 973 reactions including PAH and thermal NO chemistry. The engine case presented in [1] is used also for this work. The case is a single-injection part-load passenger car Diesel engine with 27 \% EGR fueled with regular Diesel fuel. The two different approaches are analyzed and a detailed comparison is presented for the different soot processes globally and in the mixture fraction space. The contribution of the work presented in this paper is that a method which allows for a direct comparison of soot source terms - calculated online or retrieved from a flamelet table - without any change in the simulation setup has been developed within the SRM framework. It is a unique tool for model development. Our analysis supports our previous conclusion [1] that flamelet soot source terms libraries can be used for multi-dimensional modeling of soot formation in Diesel engines.}, language = {en} } @inproceedings{MatriscianoSeidelKlaueretal., author = {Matrisciano, Andrea and Seidel, Lars and Klauer, Christian and Lehtiniemi, Harry and Mauß, Fabian}, title = {An a priori thermodynamic data analysis based chemical lumping method for the reduction of large and multi-component chemical kinetic mechanisms}, series = {5th International Workshop on Model Reduction in Reacting Flows, L{\"u}bbenau, 2015}, booktitle = {5th International Workshop on Model Reduction in Reacting Flows, L{\"u}bbenau, 2015}, pages = {2}, abstract = {A chemical species lumping approach for reduction of large hydrocarbons and oxygenated fuels is presented. The methodology is based on an a priori analysis of the Gibbs free energy of the isomer species which is then used as main criteria for the evaluation of lumped group. Isomers with similar Gibbs free energy are lumped assuming they present equal concentrations when applied to standard reactor conditions. Unlike several lumping approaches found in literature, no calculation results from the primary mechanism have been employed prior to the application of our chemical lumping strategy.}, language = {en} } @inproceedings{SeidelKlauerPasternaketal., author = {Seidel, Lars and Klauer, Christian and Pasternak, Michal and Matrisciano, Andrea and Netzer, Corinna and Hilbig, Martin and Mauß, Fabian}, title = {Systematic Mechanism Reduction for Engine Applications}, series = {5th International Workshop on Model Reduction in Reacting Flows, L{\"u}bbenau, 2015}, booktitle = {5th International Workshop on Model Reduction in Reacting Flows, L{\"u}bbenau, 2015}, pages = {2}, abstract = {In this work we apply various concepts of mechanism reduction with a PDF based method for species profile conservation. The reduction process is kept time efficient by only using 0D and 1D reactors. To account for the expansion phase in internal combustion engines a stochastic engine tool is used to validate the reduction steps.}, language = {en} } @inproceedings{SeidelPerlmanFroejdetal., author = {Seidel, Lars and Perlman, Cathleen and Fr{\"o}jd, Karin and Klaus, Anna-Katharina and Laska, Timothy and Jalving, J. and Mauß, Fabian}, title = {CPU Efficient Modelling of Biomass Gasification Using a Stochastic Reactor Approach and Chemistry Guided Reduction}, series = {22nd European Biomass Conference and Exhibition}, booktitle = {22nd European Biomass Conference and Exhibition}, editor = {Seidel, Lars}, language = {en} } @misc{SeidelPerlmanFroejdetal., author = {Seidel, Lars and Perlman, Cathleen and Fr{\"o}jd, Karin and Klaus, Anna-Katharina and Laska, Timothy and Jalving, T. and Mauß, Fabian}, title = {CPU Efficient Modelling of Biomass Gasification Using a Stochastic Reactor Approach and Chemistry Guided Reduction}, pages = {1}, language = {en} } @inproceedings{RodriguezHenriquezSeidelMauss, author = {Rodriguez Henriquez, Jose Juan and Seidel, Lars and Mauß, Fabian}, title = {Plug Flow Reactor Set-up evaluation with methane decomposition at mild conditions and overpressure}, series = {Abstract book, 7th European Combustion Meeting (ECM), Budapest, Hungary, March 30-April 2}, booktitle = {Abstract book, 7th European Combustion Meeting (ECM), Budapest, Hungary, March 30-April 2}, isbn = {978-963-12-1257-0}, language = {en} } @inproceedings{MatriscianoSeidelKlaueretal., author = {Matrisciano, Andrea and Seidel, Lars and Klauer, Christian and Mauß, Fabian and Lehtiniemi, Harry}, title = {An a priori thermodynamic data analysis based on chemical lumping method for the reduction of large and multi-component chemical kinetic mechanisms}, series = {5th Annual Internation Workshop on Model Reduction in Reaction Flows (IWMRRF) L{\"u}bbenau, 28.06-01.07.2015, proceedings}, booktitle = {5th Annual Internation Workshop on Model Reduction in Reaction Flows (IWMRRF) L{\"u}bbenau, 28.06-01.07.2015, proceedings}, pages = {2}, language = {en} } @inproceedings{LehtiniemiBorgMauss, author = {Lehtiniemi, Harry and Borg, Andreas and Mauß, Fabian}, title = {Modeling of Spray Combustion under Diesel Engine Conditions}, series = {Proceedings of the 2nd Conference on Engine Processes, July 2-3, 2015, Berlin, Germany}, booktitle = {Proceedings of the 2nd Conference on Engine Processes, July 2-3, 2015, Berlin, Germany}, editor = {Sens, Marc and Baar, Roland}, publisher = {Universit{\"a}tsverlag der TU Berlin}, address = {Berlin}, isbn = {978-3-7983-2768-9}, pages = {217 -- 249}, language = {en} } @inproceedings{PasternakMaussMatrisciano, author = {Pasternak, Michal and Mauß, Fabian and Matrisciano, Andrea}, title = {Diesel Engine Performance Mapping Using Stochastic Reactor Model}, series = {Proceedings of the 2nd Conference on Engine Processes, July 2-3, 2015, Berlin, Germany}, booktitle = {Proceedings of the 2nd Conference on Engine Processes, July 2-3, 2015, Berlin, Germany}, editor = {Sens, Marc and Baar, Roland}, publisher = {Tech. Univ., Universit{\"a}tsverlag}, address = {Berlin}, isbn = {978-3-7983-2768-9}, pages = {217 -- 232}, language = {en} } @misc{MatriscianoPasternakWangetal., author = {Matrisciano, Andrea and Pasternak, Michal and Wang, Xiaoxiao and Antoshkiv, Oleksiy and Mauß, Fabian and Berg, Peter}, title = {On the Performance of Biodiesel Blends - Experimental Data and Simulations Using a Stochastic Fuel Test Bench}, series = {SAE Technical Papers}, journal = {SAE Technical Papers}, number = {2014-01-1115}, issn = {0148-7191}, doi = {10.4271/2014-01-1115}, pages = {1 -- 8}, language = {en} } @misc{SvenssonLiShamunetal., author = {Svensson, Erik and Li, Changle and Shamun, Sam and Johansson, Bengt and Tuner, Martin and Perlman, Cathleen and Lehtiniemi, Harry and Mauß, Fabian}, title = {Potential Levels of Soot, NOx , HC and CO for Methanol Combustion}, series = {SAE Technical Papers}, journal = {SAE Technical Papers}, number = {2016-01-0887}, issn = {0148-7191}, doi = {10.4271/2016-01-0887}, pages = {17 Seiten}, abstract = {Methanol is today considered a viable green fuel for combustion engines because of its low soot emissions and the possibility of it being produced in a CO2-neutral manner. Methanol as a fuel for combustion engines have attracted interest throughout history and much research was conducted during the oil crisis in the seventies. In the beginning of the eighties the oil prices began to decrease and interest in methanol declined. This paper presents the emission potential of methanol. T-Φ maps were constructed using a 0-D reactor with constant pressure, temperature and equivalence ratio to show the emission characteristics of methanol. These maps were compared with equivalent maps for diesel fuel. The maps were then complemented with engine simulations using a stochastic reactor model (SRM), which predicts end-gas emissions. The SRM was validated using experimental results from a truck engine running in Partially Premixed Combustion (PPC) mode at medium loads. The SRM was able to predict the combustion in terms of pressure trace and rate of heat release. The CO and NOx emissions were matched, however, the HC emissions were underestimated. Finally, the trajectories from the SRM simulations were superimposed on the T-Φ maps to investigate the in engine conditions. The T-Φ map analysis shows that emission of soot are non-existent, formaldehyde can be avoided and that emissions of methane are kept at, compared to diesel combustion, low levels, however CO and NOx levels are similar to diesel combustion. These results were confirmed for engine conditions by the SRM simulations and the engine experiments.}, language = {en} } @misc{FrankenMauss, author = {Franken, Tim and Mauß, Fabian}, title = {Development of Methodology for Predictive Diesel Combustion Simulation Using 0D Stochastic Reactor Model}, series = {SAE Technical Papers}, journal = {SAE Technical Papers}, number = {2016-01-0566}, issn = {0148-7191}, doi = {10.4271/2016-01-0566}, pages = {14 Seiten}, abstract = {Stringent exhaust emission limits and new vehicle test cycles require sophisticated operating strategies for future diesel engines. Therefore, a methodology for predictive combustion simulation, focused on multiple injection operating points is proposed in this paper. The model is designated for engine performance map simulations, to improve prediction of NOx, CO and HC emissions.The combustion process is calculated using a zero dimensional direct injection stochastic reactor model based on a probability density function approach. Further, the formation of exhaust emissions is described using a detailed reaction mechanism for n-heptane, which involves 56 Species and 206 reactions. The model includes the interaction between turbulence and chemistry effects by using a variable mixing time profile. Thus, one is able to capture the effects of mixture inhomogeneities on NOx, CO and HC emission formation.The mixing time model is parameterized using transfer functions for engine operating parameters, e.g., injection mass, injection duration, air fuel ratio, start of injection and speed. These functions are calibrated for nine operating points using multi objective simulated annealing optimization combined with fast running metamodels that speed up the optimization process. The calibrated transfer functions are validated for nine additional operating points. The results for the calibration and validation points show a good match of the combustion heat release rate. Especially the main injection heat release rate is well predicted by the model. The NOx and CO emissions reflect the experimental trends and are in close range to the measurements. Finally, the model is tested for triple injection operating points. The results match the measurements, which show the applicability of the stochastic reactor model in conjunction with the mixing time transfer functions for engine performance map simulations.}, language = {en} } @misc{LehtiniemiBorgMauss, author = {Lehtiniemi, Harry and Borg, Anders and Mauß, Fabian}, title = {Combustion Modeling of Diesel Sprays}, series = {SAE Technical Papers}, journal = {SAE Technical Papers}, number = {2016-01-0592}, issn = {0148-7191}, doi = {10.4271/2016-01-0592}, pages = {1 -- 11}, abstract = {Several models for ignition, combustion and emission formation under diesel engine conditions for multi-dimensional computational fluid dynamics have been proposed in the past. It has been recognized that the use of a reasonably detailed chemistry model improves the combustion and emission prediction especially under low temperature and high exhaust gas recirculation conditions.The coupling of the combustion chemistry and the turbulent flow can be achieved with different assumptions. In this paper we investigate a selection of n-heptane spray experiments published by the Engine Combustion Network (ECN spray H) with three different combustion models: well-stirred reactor model, transient interactive flamelet model and progress variable based conditional moment closure. All models cater for the use of detailed chemistry, while the turbulence-chemistry interaction modeling and the ability to consider local effects differ.The same chemical mechanism is used by all combustion models, which allows a comparison of ignition delay, flame stabilization and flame lift-off length between the experiments and the results from simulations using the different combustion models. The investigated parameters influence the predictions of computational fluid dynamics simulations of diesel engines. This study indicates that the most reasonable behavior with respect to ignition, flame stabilization and flame structure is predicted by the progress variable based conditional moment closure model.}, language = {en} } @inproceedings{MaussMatrisciano, author = {Mauß, Fabian and Matrisciano, Andrea}, title = {SRM in Engines: Performance and Emissions}, series = {3rd International Combustion Institute Summer School, June 19-23, Chania, Greece}, booktitle = {3rd International Combustion Institute Summer School, June 19-23, Chania, Greece}, language = {en} } @inproceedings{LeondeSyniawaNawdiyalSeideletal., author = {Leon de Syniawa, Larisa and Nawdiyal, A. and Seidel, Lars and Mauß, Fabian}, title = {Formation of C5 Species from iso-Butene}, series = {Book of Abstracts, SMARTCATs 2nd General Meeting \& Workshop on Smart Energy Carriers in Industry Lisbon, 14-16 November - 2016}, booktitle = {Book of Abstracts, SMARTCATs 2nd General Meeting \& Workshop on Smart Energy Carriers in Industry Lisbon, 14-16 November - 2016}, pages = {42 -- 43}, language = {en} } @inproceedings{MalliotakisBanyonCurranetal., author = {Malliotakis, Zisis and Banyon, Colin and Curran, Henry J. and Founti, Maria and Keramiotis, Christos and Vourliotakis, George and Koutmos, Panagiotis and Paterakis, George and Souflas, Konstantinos and Mauß, Fabian and Rodriguez Henriquez, Jose Juan and Skevis, George}, title = {A Comperative Study on the Oxidation of Gaseous and Liquid fuels in a Swirlstabilized Flame via Chemiluminescence Measurements}, series = {Book of abtracts, COST SMARTCATs 2nd General Meeting, Lisbon, 14-16th November}, booktitle = {Book of abtracts, COST SMARTCATs 2nd General Meeting, Lisbon, 14-16th November}, publisher = {Cost, European Cooperation in Science and Technology}, pages = {84 -- 85}, language = {en} }