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Acceleration of flames in the presence of obstacles. Application to the safety hydrogen code.

Aurélie FAIX-GANTIER 
Doctorate thesis of physics of the University of Poitiers, 278 p. 
defended on the 18th december 2001

Document type > *Mémoire/HDR/Thesis

Keywords > hydrogen hazard, modelling, Monte Carlo simulation, reactor containment

Research Unit > IRSN/DSR/SAGR

Authors >

Publication Date > 18/12/2001

Summary

This thesis concerns the study of flame propagation in a turbulent flow of lean hydrogen-air mixtures. The aim is to precise the characteristics of propagation as well as combustion and turbulence models able to take into account the pecularities of these mixtures. This research work is related to the prevention of fire hazards associated with accidental release of hydrogen within the reactor of a nuclear power plant. In a first part, the scales (the flame velocity and thickness) associated with the laminar flame propagation in hydrogen-air mixtures are studied. A specific attention is devoted to the intrinsic instability properties of such flames. Then, the turbulence scales potentially present within a reactor are estimated in order to allow for the determination of the regimes of combustion that might be present within the reactor and among which the flamelet regime appears to be conceivable. In a second part, starting with the analysis of the propagation properties of a mean reaction zone calculated with a flamelet model, we show that, with an adequate tuning of the parameter appearing in the mean reaction rate expression, it is possible to predict numerically the turbulent flame speeds available with the litterature.


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