% % This file was created by the Typo3 extension % sevenpack version 0.7.16 % % --- Timezone: CET % Creation date: 2021-03-08 % Creation time: 13-56-25 % --- Number of references % 42 % @Article { Ghorbani.2015, title = {A PDF projection method: A pressure algorithm for stand-alone transported PDFs}, journal = {Combustion Theory and Modelling}, year = {2015}, volume = {19}, number = {2}, pages = {188--222}, DOI = {10.1080/13647830.2014.999129}, author = {Ghorbani, Asghar and Steinhilber, Gerd and Markus, Detlev and Maas, Ulrich} } @Article { Ghorbani2014, title = {Ignition by transient hot turbulent jets: An investigation of ignition mechanisms by means of a PDF/REDIM method}, journal = {Proceedings of the Combustion Institute}, year = {2015}, volume = {2}, number = {35}, pages = {2191–2198}, keywords = {{PDF} method}, url = {http://www.sciencedirect.com/science/article/pii/S1540748914002624}, ISSN = {1540-7489}, DOI = {10.1016/j.proci.2014.06.104}, author = {Ghorbani, A. and Steinhilber, G. and Markus, D. and Maas, U.} } @Article { ?, title = {Ignition by Mechanical Sparks: Ignition of Hydrogen/Air Mixtures by Submillimeter-Sized Hot Particles}, journal = {Combustion Science and Technology}, year = {2014}, month = {9}, day = {30}, volume = {186}, number = {10-11}, pages = {1606-1617}, url = {http://www.tandfonline.com/doi/pdf/10.1080/00102202.2014.935606}, web_url = {http://www.tandfonline.com/doi/full/10.1080/00102202.2014.935606\#.VDUHkbEnN8F}, DOI = {10.1080/00102202.2014.935606}, author = {Roth, David and Sharma, Pratyush and Haeber, Thomas and Schiessl, Robert and Bockhorn, Henning and Maas, Ulrich} } @Article { doi:10.1080/00102202.2014.936762, title = {Numerical Investigation of Ignition in a Transient Turbulent Jet by Means of a PDF Method}, journal = {Combustion Science and Technology}, year = {2014}, volume = {186}, number = {10-11}, pages = {1582-1596}, url = {http://dx.doi.org/10.1080/00102202.2014.936762}, DOI = {10.1080/00102202.2014.936762}, author = {Ghorbani, A. and Steinhilber, G. and Markus, D. and Maas, U.} } @Article { , title = {Pyrolysis of ethanol: A shock-tube/TOF-MS and modeling study}, journal = {Proc. Combust. Inst.}, year = {2014}, DOI = {10.1016/j.proci.2014.05.086}, author = {Kiecherer, Johannes and B{\"a}nsch, Cornelie and Bentz, Tobias and Olzmann, Matthias} } @Article { BKSO2013, title = {Reaction of Dimethyl Ether with Hydroxyl Radicals: Kinetic Isotope Effect and Prereactive Complex Formation}, journal = {J. Phys. Chem. A}, year = {2013}, month = {8}, day = {5}, volume = {117}, pages = {8343-8351}, DOI = {10.1021/jp405724a}, author = {B{\"a}nsch, Cornelie and Kiecherer, Johannes and Sz{\"o}ri, Milan and Olzmann, Matthias} } @Article { , title = {Decaying versus stationary turbulence in particle-laden isotropic turbulence: Heavy particle statistics modifications}, journal = {Phys. Fluids}, year = {2013}, volume = {25}, pages = {033303}, author = {Abdelsamie, Abouelmagd and Lee, Changhoon} } @Article { AbdelsamieL2012, title = {Decaying versus stationary turbulence in particle-laden isotropic turbulence: Turbulence modulation mechanism}, journal = {Phys. Fluids}, year = {2012}, volume = {24}, pages = {015106}, author = {Abdelsamie, Abouelmagd and Lee, Changhoon} } @Article { , title = {Impact of volume viscosity on the structure of turbulent premixed flames in the thin reaction zone regime}, journal = {Flow Turbul. Combust.}, year = {2012}, volume = {88}, pages = {451-478}, author = {Fru, Gordon and Janiga, Gabor and Thevenin, Dominique} } @Article { Markus12, title = {Characterization of the ignition by repetitive streamer discharges using laser diagnostics}, journal = {J. Loss Prev. Process Ind.}, year = {2012}, volume = {26}, number = {2}, pages = {324–328}, abstract = {Repetitive streamer discharges caused by transients, e.g. due to high frequency overvoltages, can ignite combustible mixtures, which has to be taken into account concerning the safety assessment of electrical apparatus for usage in hazardous areas. Hydrogen/air mixtures were ignited inside a closed vessel using a rod/plane electrode configuration. Alternating voltage with a frequency between 600 and 750 kHz and amplitudes of up to 20 kV was used to produce streamer discharges. The ignition process and the subsequent flame front propagation were examined with respect to mixture composition and several electrical parameters using time-resolved measurements of planar laser-induced fluorescence (PLIF) of OH radicals. A multiple pulse laser and detection system was used to assemble four images during one experiment. These measurements have given detailed information about the point of ignition and flame velocities. The experimental results will be used to validate numerical simulations of ignition by streamer discharges, which will yield deep insights into this specific ignition process.}, DOI = {10.1016/j.jlp.2011.10.002}, author = {Markus, Detlev and Hallermann, Aljoscha and Paul, Michael and Langer, Tim and Lienesch, Frank} } @Article { Sadanandan10, title = {2D Mixture Fraction Studies in a Hot-Jet Ignition Configuration Using NO-LIF and Correlation Analysis}, journal = {Flow Turbulence Combust.}, year = {2011}, volume = {86}, pages = {45-62}, abstract = {The problem of measuring mixture fraction (defined here as the fractional part of mass originating from the exhaust gas jet) during the mixing of an unsteady hot exhaust gas jet impinging into a quiescent premixed hydrogen/air mixture is addressed. The diagnostic method is based on planar Laser-Induced Fluorescence of nitric oxide (NO) that is seeded to the hot jet and used as a tag for mixture fraction. The research work presented in this paper focusses on the analytical and experimental data employed for the estimation of mixture fraction using NO as a tracer. Since the NO LIF-signal does not solely depend on the amount of NO, but also on temperature and overall chemical composition, additional information is normally required to transform LIF-signals into mixture fraction values. To provide this additional information, the concept of reduced state spaces is applied: Correlations between state variables (temperature and species) are exploited to establish relationships between the measured signal and the mixture fraction. Simple numerical model simulations are used in combination with spectroscopic calculations to check for correlations between NO-LIF signal and mixture fraction. The result is that sharp correlations between NO-LIF signals and mixture fraction exist, provided that chemical reactions have not yet significantly influenced the flow. These correlations display only little sensitivity with respect to changes of the jet temperature, amount of NO seeded to the jet, and jet velocity. Measurements of NO-LIF were then performed for a non-reacting case before ignition, and mixture fraction maps were obtained from the measured LIF-signals by exploiting the correlations. The resulting data reveal the different driving forces behind mixing at regions near to the jet tip and at the radial shear layers.}, publisher = {Springer Netherlands}, DOI = {10.1007/s10494-010-9285-0}, author = {Sadanandan, Rajesh and Schie{\ss}l, Robert and Markus, Detlev and Maas, Ulrich} } @Article { , title = {Direct Numerical Simulations of the impact of high turbulence intensities and volume viscosity on premixed methane flames}, journal = {J. Combust.}, year = {2011}, volume = {746719}, pages = {1-12}, author = {Fru, Gordon and Janiga, Gabor and Thevenin, Dominique} } @Article { FruTJ2011, title = {Impact of turbulence intensity and equivalence ratio on the burning rate of premixed methane-air flames}, journal = {Energies}, year = {2011}, volume = {4}, number = {6}, pages = {878-893}, author = {Fru, Gordon and Thevenin, Dominique and Janiga, Gabor} } @Article { Langer11, title = {Repetitive streamer discharges leading to ignition of hydrogen/air mixtures}, journal = {Sci. Technol. Energetic Mater.}, year = {2011}, volume = {72}, number = {2}, pages = {51-56}, abstract = {Repetitive streamer discharges due to high-frequency AC voltage can ignite H2/air mixtures and are the focus of research concerning the explosion protection of electrical apparatuses. The ignition process is not understood in detail. In streamer discharges, a non-equilibrium plasma occurs leading to the formation of chemically active radicals, such as atomic oxygen and atomic hydrogen as well as hydroxyl. The influence of the radical build up during repetitive streamer discharges on the ignition process is examined. Using detailed chemical kinetics describing the discharge phase and its afterglow, the ignition of H2/air mixtures is studied. The influence of the reduced electric field and the electron density on the ignition is examined numerically.}, author = {Langer, Tim and Markus, Detlev and Maas, Ulrich} } @Article { ShalabyT2010, title = {Statistically significant results for the propagation of a turbulent flame kernel using Direct Numerical Simulations}, journal = {Flow Turbulence Combust.}, year = {2010}, volume = {84}, number = {3}, pages = {357-367}, author = {Shalaby, Hemdand and Thevenin, Dominique} } @Article { Langer10, title = {Streamer discharges caused by highfrequency voltage leading to ignition of hydrogen/air mixtures}, journal = {Combust. Sci. and Tech.}, year = {2010}, volume = {182}, pages = {1718-1745}, abstract = {The authors investigated the ignition process of hydrogen/air mixtures by repetitive streamer discharges due to high-frequency AC voltage in order to achieve a better comprehension in matters of safety engineering. Therefore, the dependence of ignition on the number of voltage cycles is examined. The location of the highest ignition probability is analysed. The electric field strength in the test setup is calculated to explain the obtained effect of different streamer elongation for different polarities. The streamer current is investigated. The streamer radius and length in air are determined. Considering the impact of the discharge as gas heating the minimum ignition energy density of different hydrogen/air mixtures is calculated using detailed chemical kinetics. Based on this approach, the energy deposition resulting from streamer discharges in the gas mixture is estimated.}, keywords = {AC voltage; Explosion protection; Hydrogen; Ignition; Streamer discharge; Streamer length; Streamer radius}, DOI = {10.1080/00102202.2010.497374}, author = {Langer, Tim and Markus, Detlev and Lienesch, Frank and Maas, Ulrich} } @Article { Lienesch09, title = {Ignition of hydrogen/air mixtures through electric discharges at high frequency {AC} voltage}, journal = {Chem. Eng. Technol.}, year = {2009}, volume = {32}, pages = {288-291}, DOI = {10.1002/ceat.200800528}, author = {Lienesch, F. and Spilling, M. and Langer, T. and Markus, D.} } @Article { Sadanandan06, title = {Detailed investigation of ignition by hot gas jets}, journal = {Proc. Combust. Inst.}, year = {2006}, volume = {31}, pages = {719-726}, DOI = {10.1016/j.proci.2006.08.027}, author = {Sadanandan, Rajesh and Schie{\ss}l, Robert and Markus, Detlev and Maas, Ulrich and Olofsson, Jimmy and Seyfried, Hans and Richter, Mathias and Ald{\'e}n, Marcus} } @Conference { Ghorbani.2015, title = {Application of a stand-alone PDF method to investigate the ignition of propane/air and hydrogen/air mixture by unsteady turbulent jets}, year = {2015}, pages = {P4-02}, booktitle = {Proceedings of the European Combustion Meeting -- 2015}, ISBN = {978-963-12-1257-0}, author = {Ghorbani, A. and Fischer, S. and Steinhilber, G. and Markus, D. and Maas, U.} } @Conference { Seitz.2015, title = {Evaluation strategies for LIF-based measurements of the mixing field in a transient free jet}, year = {2015}, pages = {P4-06}, booktitle = {Proceedings of the European Combustion Meeting -- 2015}, ISBN = {978-963-12-1257-0}, author = {Seitz, F. and Schie{\ss}l, R. and Markus, D.} } @Conference { Essmann.2015, title = {Investigation of the Pressure Wave and Hot Gas Kernel Induced by Low Energy Electrical Discharges}, year = {2015}, address = {Leeds, UK}, booktitle = {25th International Colloquium on the Dynamics of Explosions and Reactive Systems}, author = {Essmann, S. and Markus, D. and Maas, U.} } @Conference { Ghorbani.2015, title = {Numerical investigation and comparison of hydrogen/air and propane/air explosion by hot jets}, year = {2015}, address = {Leeds, IK}, booktitle = {25th International Colloquium on the Dynamics of Explosions and Reactive Systems}, author = {Ghorbani, A. and Fischer, S. and Steinhilber, G. and Markus, D. and Maas, U.} } @Conference { Essmann.2015, title = {Schlieren measurements of the pressure wave induced by low energy electrical discharges}, year = {2015}, pages = {P4-01}, booktitle = {Proceedings of the European Combustion Meeting -- 2015}, ISBN = {978-963-12-1257-0}, author = {Essmann, S. and Markus, D. and Maas, U.} } @Conference { Ghorbani14c, title = {{Numerical investigation of ignition events initiated by a hot turbulent jet using a PDF method}}, year = {2014}, number = {June 2014}, keywords = {explosion protection,flameproof enclosure,ignition,pdf method,transient jet}, booktitle = {10\(^{th}\) International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions}, author = {Ghorbani, A and Markus, D and Steinhilber, G and Maas, U} } @Conference { ICDERS2013Roth, title = {Ignition by Mechanical Sparks – Ignition Temperatures of Hydrogen / Air-Mixtures Ignited by Small Metal / Ceramic Particles}, year = {2013}, month = {7}, day = {28}, event_place = {Taipeh,Taiwan}, event_name = {International Colloquium on the Dynamics of Explosions and Reactive Systems (ICDERS)}, event_date = {28 July - 2 August 2013}, author = {Roth, David and Sharma, Pratyush and Haeber, Thomas and Schiessl, Robert and Bockhorn, Henning and Maas, Ulrich} } @Conference { ECM2013Roth, title = {Ignition of Explosive Gas Mixtures by Small Hot Particles, Paper P3-44}, year = {2013}, month = {6}, day = {28}, event_place = {Lund, Sweden}, event_name = {European Combustion Meeting}, event_date = {25-28 Juni 2014}, ISBN = {978-91-637-2151-9}, author = {Roth, David and Sharma, Pratyush and Haeber, Thomas and Schiessl, Robert and Maas, Ulrich and Bockhorn, Henning} } @Conference { 978-91-637-2151-9, title = {Modeling of self-ignition of diethyl ether/oxygen mixtures}, year = {2013}, month = {6}, day = {26}, pages = {P3-13}, booktitle = {Proceedings of the European Combustion Meeting 2013}, event_place = {Lund, Sweden}, event_name = {European Combustion Meeting - 2013}, event_date = {June 25-28, 2013}, ISBN = {978-91-637-2151-9}, author = {Kiecherer, Johannes and Derstroff, Bettina and Magar, Max and Maas, Ulrich and Olzmann, Matthias} } @Conference { Markus13, title = {Temperature measurements inside repetitive streamer discharges and comparison with numerical simulations}, year = {2013}, month = {6}, day = {26}, tags = {AIAA 2013-3006}, publisher = {American Institute of Aeronautics and Astronautics}, booktitle = {44th AIAA Plasmadynamics and Lasers Conference}, event_place = {San Diego, CA, USA}, event_name = {44th AIAA Plasmadynamics and Lasers Conference}, event_date = {June 24-27, 2013}, DOI = {10.2514/6.2013-3006}, author = {Markus, Detlev and Maas, Ulrich} } @Conference { Essmann13, title = {Investigation of Ignition by Low Energy Capacitance Sparks , Paper P3-45}, year = {2013}, month = {6}, day = {26}, pages = {6pp}, booktitle = {Proceedings of the European Combustion Meeting – 2013}, event_place = {Lund, Sweden}, event_name = {European Combustion Meeting – 2013}, event_date = {June 25-28, 2013}, ISBN = {978-91-637-2151-9}, author = {Essmann, Stefan and Markus, Detlev and Maas, Ulrich} } @Conference { Seitz13, title = {Experimental and Numerical Investigation of Transient Variable-density Free Jets, Paper P2-46}, year = {2013}, month = {6}, day = {25}, pages = {5pp}, booktitle = {Proceedings of the European Combustion Meeting – 2013}, event_place = {Lund, Sweden}, event_name = {European Combustion Meeting – 2013}, event_date = {June 25-28, 2013}, ISBN = {978-91-637-2151-9}, author = {Seitz, Franziska and Ghorbani, Asghar and Schie{\ss}l, Robert and Markus, Detlev and Maas, Ulrich} } @Conference { Ghorbani13, title = {{Application of a PDF method to transient reactive jets}}, year = {2013}, address = {Taipei, Taiwan}, booktitle = {24\(^{th}\) International Colloquium on the Dynamics of Explosions and Reactive System}, author = {Ghorbani, A and Steinhilber, G and Markus, D and Maas, U} } @Conference { Ghorbani13a, title = {Application of a {PDF} method and {DNS to ignition processes in transient turbulent jets}}, year = {2013}, event_place = {San Antonio, Texas, USA}, event_name = {14\(^{th}\) International Conference on Numerical Combustion}, event_date = {April 8-10, 2013}, author = {Ghorbani, A and Fru, G and Markus, D and Th{\'e}venin, D and Maas, U} } @Conference { AbdelsamieT2013, title = {Direct Numerical Simulations of turbulent H2-air pre-mixtures and analysis towards safety-relevant ignition prediction}, year = {2013}, editor = {Fr{\"o}hlich, J.}, publisher = {Springer}, booktitle = {Direct and Large-Eddy Simulation IX}, event_place = {Dresden, Germany}, event_name = {Direct and Large-Eddy Simulation IX}, author = {Fru, Gordon and Thevenin, Dominique} } @Conference { AbdelsamieT2014, title = {Modulation of isotropic turbulence by resolved and non-resolved spherical particles}, year = {2013}, note = {in press}, editor = {Fr{\"o}hlich, J.}, publisher = {Springer}, booktitle = {Direct and Large-Eddy Simulation IX}, event_place = {Dresden, Germany}, event_name = {Direct and Large-Eddy Simulation IX}, author = {Abdelsamie, Abouelmagd and Thevenin, Dominique} } @Conference { AbdelsamieCT2013, title = {Stationary and decaying turbulence modulation by finite size fully resolved particles}, year = {2013}, booktitle = {the International Conference on Multiphase Flows}, event_place = {Jeju, Korea}, event_name = {the International Conference on Multiphase Flows}, event_date = {2013}, author = {Abdelsamie, Abouelmagd and Chittipotula, Thirumalesha and Thevenin, Dominique} } @Conference { , title = {Turbulence modulation by fully resolved particles using immersed boundary methods}, year = {2013}, booktitle = {Joint EUROMECH / ERCOFTAC Colloquium 549, “Immersed Boundary Methods: Current Status and Future Research Directions”}, event_place = {Leiden, The Netherlands}, event_name = {oint EUROMECH / ERCOFTAC Colloquium 549, “Immersed Boundary Methods: Current Status and Future Research Directions”}, event_date = {17-19 June}, author = {Abdelsamie, Abouelmagd and Thevenin, Dominique} } @Conference { Ghorbani12, title = {{Application of a PDF method to variable-density jets}}, year = {2012}, editor = {Hanjalic, K. and Nagano, Y. and Borello, D. and Jakirlic, S.}, publisher = {Begell House Inc.}, address = {New York}, booktitle = {7\(^{th}\) International Symposium on Turbulence, Heat and Mass Transfer}, event_place = {Palermo, Italy}, event_name = {7\(^{th}\) International Symposium on Turbulence, Heat and Mass Transfer}, DOI = {10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1380}, author = {Ghorbani, A and Markus, D and Maas, U} } @Conference { Markus11a, title = {Investigation of the ignition by repetitive streamer discharges using time-resolved OH LIF measurements}, year = {2011}, month = {7}, day = {24}, abstract = {Non-equilibrium plasmas like in streamer discharges have a significant influence on ignition and combustion processes. The formation of electronically excited species using non-equilibrium plasmas can enhance burning velocities and reduce ignition delay times or autoignition temperatures, respectively. The promotion of the ignition and combustion processes is mainly explained by the production of atomic oxygen either by quenching electronically excited N2 or by the electron impact dissociation of O2. Streamer discharges occur at atmospheric pressures as the initial process of the temporal evolution of an electrical breakdown. Considering AC voltage with high frequency, streamer discharges occur only at the peak voltage. Depending on the electrode configuration, the discharge time is possibly too short for a complete breakdown within the electrode distance. Therefore, a spark breakdown can not occur. While a single streamer discharge has only minor influence on the combustible gas mixture concerning gas temperature and mixture composition, repetitive streamer discharges can ignite combustible/air mixtures. This has to be avoided in hazardous areas. The ignition of combustible/air mixtures by electrical sparks, which has been examined experimentally and numerically in detail, is mainly dominated by the local heating of the gas mixture. However, for a detailed understanding of the ignition by streamer discharges, it is essential to examine additionally the production of radicals in the non-equilibrium plasma and the accumulation of energy considering repetitive streamer discharges. A numerical simulation of the ignition processes requires more detailed experimental information. Therefore, this work presents experimental investigations of the ignition of H2/air mixtures by repetitive streamer discharges at atmospheric pressure using a rod/plane electrode configuration with alternating current at high frequency (f = 740 kHz). Time-resolved high speed imaging of laser induced fluorescence (LIF) of OH radicals after the ignition of different H2/air mixtures in the mixture range from 10 Vol.\% to 40 Vol.\% H2 in air is performed to examine the temporal flame kernel growth after ignition. The experimental results are compared to numerical simulations using a one-dimensional approximation, which will be used in future work to yield detailed information about the energy densities inside the ignition volume.}, booktitle = {23rd International Colloquium on the Dynamics of Explosions and Reactive Systems}, event_place = {Irvine, Calif.}, event_date = {24-29, July, 2011}, author = {Markus, Detlev and Hallermann, Aljoscha and Langer, Tim and Lienesch, Frank and Maas, Ulrich} } @Conference { Markus11, title = {Experimental Investigation of the Ignition by Repetitive Streamer Discharges}, year = {2011}, month = {6}, day = {27}, abstract = {A time-resolved study of the flame kernel growth after the ignition of different H2/air mixtures at atmospheric pressure is reported. For this purpose, hydroxyl radicals are measured by means of planar laser-induced fluorescence (OH-PLIF). The H2/air mixtures are ignited by repetitively pulsed streamer discharges which occur at atmospheric pressure within a rod/plane electrode configuration using alternating voltage amplitudes of up to 20 kV with a frequency of 740 kHz. The flame propagation is examined evaluating the flame front position from the signal intensities of the OH-PLIF. Numerical simulations of the ignition of H2/air mixtures are performed using well-known detailed chemistry and transport models based on a one-dimensional model. Numerical and experimental flame kernel growths are compared showing excellent agreement. The results will be used to achieve a better understanding of the molecular reactions in the non-equilibrium plasma of repetitive streamer discharges.}, tags = {AIAA 2011-3451}, booktitle = {42nd AIAA Plasmadynamics and Lasers Conference}, event_place = {Honolulu, Hawaii}, event_date = {27. - 30. June 2011}, DOI = {10.2514/6.2011-3451}, author = {Markus, Detlev and Hallermann, Aljoscha and Langer, Tim and Paul, Michael and Lienesch, Frank} } @Conference { Langer.2011, title = {Influence of Non-Equilibrium Plasma on the Ignition Process due to Repetitive Streamer Discharges}, year = {2011}, month = {6}, day = {27}, abstract = {A one-dimensional numerical model to simulate the ignition process of hydrogen/air mixtures due to repetitive streamer discharges is presented. The influence of the reduced electric field and the electron density on the temperature in the discharge volume and the ignition delay time is studied. The energy source term is separated into a thermal and a nonequilibrium part. Thus, the energy coupling to the plasma can be analyzed.}, tags = {AIAA 2011-3450}, booktitle = {42nd AIAA Plasmadynamics and Lasers Conference}, event_place = {Honolulu, Hawaii}, event_date = {27. - 30. June 2011}, DOI = {10.2514/6.2011-3450}, author = {Langer, Tim and Markus, Detlev and Maas, Ulrich} } @Conference { FruJT2011, title = {Probability of Successful Ignition Events in Turbulent Flows Using Direct Numerical Simulation}, year = {2011}, booktitle = {Proc. 13th International Conference on Numerical Combustion}, event_name = {Proc. 13th International Conference on Numerical Combustion}, author = {Fru, Gordon and Janiga, Gabor and Thevenin, Dominique} } @Phdthesis { Langer13, title = {Z{\"u}ndung von Wasserstoff/Luft-Gemischen durch repetierende Teilentladungen}, year = {2013}, school = {Karlsruhe Institut of Technology}, author = {Langer, Tim} }