Experimentelle Ermittlung der laminaren Flammengeschwindigkeit brennbarer Staub/Luft Gemische

Translated title of the contribution: Experimental determination of the laminar flame velocity in dust air mixtures

Bruno Wimmer

Research output: ThesisMaster's Thesis

Abstract

In the past explosions of dust air mixtures led to serious accidents in the industry. Besides high property damage, persons can be injured or even killed. To avoid explosions, safety relevant data are necessary. With this data dust should easily be characterized due to its dangerousness. These parameters also have to be comparable. Two very important indicators are maximum pressure pmax and the maximum rate of pressure rise (dp/dt)max. Those parameters are strongly dependent on ignition time and ignition delay. The challenge in the determination of safety relevant data of dust air mixtures is to find the same test conditions, including turbulences. The laminar flame velocity could be the safety relevant parameter which focuses on the material properties during combustion without mass, momentum and energy exchanges. In line with the tubemethode, test equipment was built. Lycopodium was used as model substance and a screw conveyor transported the dust into the combustion pipe. In this thesis the laminar flame velocity is determinated by Andrews`s and Bradley`s equation. Furthermore the influence of the decrease oxygen concentration on the laminar flame velocity is observed. The results of this study are compared with values from literature. Experiments have shown that an improved pilot plant has to be developed.
Translated title of the contributionExperimental determination of the laminar flame velocity in dust air mixtures
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Kern, Hannes, Co-Supervisor (internal)
  • Raupenstrauch, Harald, Supervisor (internal)
Award date13 Dec 2013
Publication statusPublished - 2013

Bibliographical note

embargoed until 23-09-2018

Keywords

  • Dust explosions
  • Flame velocity
  • Safety relevant parameters

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