A5070368844- Combustion and Detonation Processes
- Combustion and flame dynamics
- Advanced Combustion Engine Technologies
- Risk and Safety Analysis
- Plasma Applications and Diagnostics
- Fire dynamics and safety research
- Plasma Diagnostics and Applications
- Energetic Materials and Combustion
- Structural Response to Dynamic Loads
- Radiation Detection and Scintillator Technologies
- Atomic and Molecular Physics
- Laser Design and Applications
- Atomic and Subatomic Physics Research
- Spectroscopy and Laser Applications
- Thermal and Kinetic Analysis
- Heat transfer and supercritical fluids
- Nuclear physics research studies
- Electrostatic Discharge in Electronics
- Atmospheric chemistry and aerosols
- Advanced Chemical Physics Studies
- Dark Matter and Cosmic Phenomena
- Wind and Air Flow Studies
- Laser-induced spectroscopy and plasma
- Lightning and Electromagnetic Phenomena
- Nuclear Physics and Applications
Physikalisch-Technische Bundesanstalt
2015-2024
Max Planck Institute for Nuclear Physics
2024
Johannes Gutenberg University Mainz
2021-2024
Physical and Technical Institute
2011-2013
Software (Spain)
2007
German United Services Trade Union
2007
Karlsruhe Institute of Technology
2004
Bielefeld University
1997
Ammonia is an attractive hydrogen carrier and potential fuel which could play a role in decarbonizing process heat, power or transport applications. However, the combustion properties of ammonia are disadvantageous for many technical processes. Hydrogen addition has been shown to mitigate this challenge by increasing laminar burning velocity extending lean blow-off limit. In work, ignition characteristics enriched ammonia/air mixtures investigated experimentally. A capacitive discharge used...
In the context of explosion protection, very conservative safety factors need to be considered, e.g. in design electrical devices. This is due standards which are mainly based on empirical data as opposed a detailed knowledge underlying physiochemical processes. this work, early phase ignition burnable gas mixtures close their respective minimum energy investigated experimentally by means high-speed schlieren imaging. Our quantifies how process at such low energies becomes less repeatable...
Numerical simulations were carried out in order to study the channel expansion of a low-energy spark air after breakdown that resulted formation initial arc channel. The spark-discharge model considers electric circuit parameters, gas-dynamic processes, thermal gas ionization, non-equilibrium chemical reactions, electron heat transfer, and radiation. A specific feature is its ability simulate when only parameters (R, L, C) discharge gap length are given. results numerical investigation...
A numerical investigation is carried out to study the ignition of a hydrogen/air mixture by hot turbulent jet. stand-alone probability density function method used model reacting flow. In order reduce computational cost chemical reactions, reaction diffusion manifold technique applied for an automatic mechanism reduction. The delay time and length are investigated with respect various inlet temperatures as well nozzle diameter jet velocity. simulation results reveal that immediately after...
In this work, we investigate the expansion of hot gas kernel and pressure wave induced by electrical discharges near minimum ignition energy experimentally means a schlieren setup numerically through one-dimensional simulations. The effects discharge density on are discussed. Via comparison experimental values with numerical simulations, an estimate overall losses is presented.
A new neutron polarimeter for measuring the neutron's electric form factor was designed and constructed to complement A1 spectrometer setup at Mainz Microtron (MAMI). The design is based on a previous with significant improvements halve error of extracted factor. higher granularity sections deeper first section one hand, faster readout employing Time-over-Threshold methods measure signal amplitudes combined high-precision FPGA-based TDC other hand will allow achieve this goal. performance...
The authors investigated the ignition process of hydrogen/air mixtures by repetitive streamer discharges due to high-frequency AC voltage in order achieve a better comprehension matters safety engineering. Therefore, dependence on number cycles is examined. location highest probability analysed. electric field strength test setup calculated explain obtained effect different elongation for polarities. current investigated. radius and length air are determined. Considering impact discharge as...
Many devices used in the chemical or petrochemical industry involve hazards because of existence flammable gases. Thus, lean and rich flammability limits are very important characteristics homogeneous gas mixtures. These data documented summarized various reports, but there discrepancies between reported limits. Also, is a lack for mixtures To complement experimental measurements, calculation tremendous interest. This article reports computational study premixed CH 3 OH/air OH/CH 4 /air...
Abstract A numerical investigation is carried out to study ignition events of different premixed stoichiometric fuel/air mixtures by hot exhaust gas jets. The simulations are performed for premixed, hydrogen/air, ethylene/air and propane/air in configurations relevant safety applications. the their corresponding jet examined qualitatively analyzing processes conditions leading ignition. stand-alone probability density function (PDF) method connection with a projection (PM) calculate mean...