Staubdetonationen in Rohrleitungen Abschlussbericht

Dust explosions propagating into tubes may accelerate and show transition to a stable detonation regime. The conditions allowing the existence of detonations in a certain mixture and the detonation parameters can not be derived from the results of the standard explosion test procedures. It is the aim of this work to continue previous experiments and to extend the knowledge in the field of dust detonation, especially to investigate dust-air-mixtures at an initial pressure of 0.1 MPa. For that a new dust detonation tube was constructed, with an inner diameter of 300 mm and a length of 40 m. This tube is equipped with a dispersion system, which is able to generate a uniform dust-gas-mixture of known concentration in the whole test section. Different ignition methods and energies were applied to initiate the process. The investigations refer to the detonation velocity and pressure, the acceleration and transition to detonation, the cell structure, and the dynamic mechanical reaction of the tube. For cornstarch-air-mixtures the existence of stable detonations was demonstrated depending on the concentration. Even with weak ignition sources transition to detonation was achieved within the test section. More reactive mixtures with higher K_S_t-values show significantly shorter transition distances. In the case of dust detonation the dynamic structural strains of the tube wall reach high local peak values. (orig.)Available from TIB Hannover: F97B1768+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany); BASF AG, Ludwigshafen am Rhein (Germany); Berufsgenossenschaft der Chemischen Industrie, Heidelberg (Germany); Berufsgenossenschaft Nahrungsmittel und Gaststaetten, Mannheim (Germany)DEGerman

Wiederinbetriebnahme des Stosswellenkanals an der RWTH Aachen

SIGLETIB: FR 4166 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Druckausbreitung im Grubengebaeude unter besonderer Beruecksichtigung von Streckeneinbauten und -verzweigungen sowie Simulationsversuche im Stosswellenrohr Abschlussbericht

Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Feasibility Study on the Use of Non-Thermal Plasma for a Cold Radio Blackout Experiment

The presented study proposes a new method duplicating the re-entry radio blackout using electron density controllable non-thermal plasma layers. An electron density controllable non-thermal plasma source will be using dielectric barrier discharges (DBD) to reproduces the spatial electron density gradient of the re-entry plasma sheath. In this study, we assess the feasibility to duplicate the electron density gradient using a controllable thin-layer DBD plasma system fabricated with printed electronics. The measured electron density of a DBD plasma layer is in the range of 10^17 1/m^3 to 10^22 1/m^3 , which coincides with the levels reached during atmospheric re-entry and is therefore enough to cause re-entry radio blackout