par Smirnov, NICKOLAY 
;Nikitin, Valeriy V.F.;Shevtsova, Valentina ;Legros, Jean Claude
Référence Combustion Processes in Propulsion, Elsevier Inc., page (305-314)
Publication Publié, 2005
;Nikitin, Valeriy V.F.;Shevtsova, Valentina ;Legros, Jean Claude Référence Combustion Processes in Propulsion, Elsevier Inc., page (305-314)
Publication Publié, 2005
Partie d'ouvrage collectif
| Résumé : | This chapter discusses the influence of geometrical characteristics of the ignition chambers and flow turbulization on the onset of detonation and the influence of temperature and fuel concentration on the unburned mixture. The operation mode of the pulsed detonation wave generator is closely related to the periodical onset and degeneration of a detonation wave. The unsteady-state regimes should be self-sustained to guarantee a reliable operation of such devices. Minimizing the predetonation length and ensuring stability of the onset of detonation enables an increased effectiveness of pulsed detonation devices. The presence of one or two turbulizing chambers in the ignition section, the chambers of wider cross-section mounted in the ignition section of the detonation tube and filled with lean hydrocarbon-air mixtures, and the preheating of the mixture promotes the deflagration-to-detonation transition (DDT) and shortens the predetonation length. The presence of turbulizing chambers makes the DDT process less sensitive to the variation of ignition conditions. The absence of turbulizing chambers increases the predetonation length for similar initial conditions and makes the transition process very unstable with the onset of detonation having a sporadic character, the predetonation length varying stochastically, and making the DDT process very sensitive to ignition conditions. © 2005 Elsevier Inc. All rights reserved. |
