Project 5 is focused on the experimental examination of ignition by electrical discharges with respect to safety assessment in hazardous areas. In the first period, two important types of electrical discharges – non-equilibrium plasmas due to streamer discharges and thermal plasmas – shall be examined.
The energy of an examined electrical discharge is always near the minimum ignition energy. Using optical emission spectroscopy, detailed information about the temporal evolution of atomic oxygen and rotational and vibrational temperatures of molecular nitrogen can be yielded. Time and spatially resolved laser-induced fluorescence measurements of OH radicals will be performed yielding four subsequent images during one single ignition event. Hence, detailed information about flame kernel growth and flame velocities can be derived. In the case of ignition by non-equilibrium plasmas detailed examination of atomic oxygen using two-photon absorption laser-induced fluorescence will be used to examine the temporal evolution of this radical in the ignition volume. All these experiments are necessary a) in the case of thermal plasmas to determine the thermal losses towards the electrodes and b) in the case of non-equilibrium plasmas to develop a kinetic scheme of the chemical processes by streamer discharges.
Along with numerical simulations of these processes useful information about the ignition process induced by electrical discharges will be yielded.
Project leader | Dr.-Ing. Detlev Markus |
Researcher | Stefan Essmann |
Articles: | |
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12. | J. Loss Prev. Process Ind. 26 (2), 324–328 (2012) |
11. | Sci. Technol. Energetic Mater. 72 (2), 51-56 (2011) |
10. | Combust. Sci. and Tech. 182, 1718-1745 (2010) |
9. | Chem. Eng. Technol. 32, 288-291 (2009) |
Conferences: | |
8. |
25th International Colloquium on the Dynamics of Explosions and Reactive Systems
Leeds, UK
2015
|
7. |
Proceedings of the European Combustion Meeting -- 2015
, page P4-01.
2015
978-963-12-1257-0
|
6. |
44th AIAA Plasmadynamics and Lasers Conference
Publisher: American Institute of Aeronautics and Astronautics,
June
2013
DOI: 10.2514/6.2013-3006
|
5. |
Proceedings of the European Combustion Meeting – 2013
, page 6pp.
June
2013
978-91-637-2151-9
|
4. |
23rd International Colloquium on the Dynamics of Explosions and Reactive Systems
July
2011
|
3. |
42nd AIAA Plasmadynamics and Lasers Conference
June
2011
DOI: 10.2514/6.2011-3451
|
2. |
42nd AIAA Plasmadynamics and Lasers Conference
June
2011
DOI: 10.2514/6.2011-3450
|
PhD theses: | |
1. |
Karlsruhe Institut of Technology,
2013
|