A PDF-Module for Turbulent Deflagration Structure Computation


  1. Zhang, F.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
In the FAE chemical initiation and the after-burning processes of oxigen-deficient explosives in various applications, a compressible, turbulent, fast flame with a "thick" distributed reaction zone is encountered. Owing to the complicated interaction between turbulent mixing and combustion, the physical mechanism for this fast turbulent flame regime leading to DDT has not been resolved and the numerical modelling is still in its pioneer stage. This work was only a preliminary study in developing a model and its numerical scheme that describes a quasi-one-dimensional turbulent defraglation structure associated with local points on the flame front in the distributed flame regime. This quasi-one-dimensional model of turbulent flame structure can in future be coupled in a front-tracking algorithm that simulates the unsteady fast turbulent defraglation leading to a DDT process. Owing to the stochastic nature and high turbulent intensity of the distributed flame regime, the model was based on Pope's PDF module and used a hybrid numerical scheme. In this scheme, the real chemical compositions and enthalpy were computed using the Monte Carlo method for the joint scalar PDF transport equations to capture the stochastic non-uniformity of the chemical compositions and temperature. TRUNCATED
DDT (Deflagration to Detonation Transition);Internal explosions
Report Number
DRES-TR-1999-020 — Technical Report
Date of publication
01 Nov 1999
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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