SharePoint
Aide
IRSN, Institut de radioprotection et de sûreté nucléaire

Search our site :

ok

Contact us :

ok
En Fr

Enhancing Nuclear Safety


Research

Publications

Experimental study and modeling of hydrogen combustion in a flammable atmosphere in the presence of water drops

Homan Cheikhravat, doctorate of University of Orléans, 260 p., defended on the 25th september 2009

Document type > *Mémoire/HDR/Thesis

Keywords > suspended sediment, cutaneous syndrome, AREVA NC

Research Unit > IRSN/DSR/SAGR

Authors > CHEIKHRAVAT Homan

Publication Date > 25/09/2009

Summary

This thesis is part of safety studies on Pressurized Water Reactors for nuclear power plants. Scenarios including a release of hydrogen predict to trigger spraying in order to reduce the pressure and collect the aerosols towards the bottom. However spraying involves lowering the temperature and, consequently, the content of water vapor initially sufficient to render the atmosphere inert. The purpose of this thesis is to study the desinerting conditions of premixed hydrogen / air / water vapor in presence of fogs and then to analyze the interaction between the water spray and the f1ame which can initially be laminar or turbulent. For this purpose two facilities have been designed: a sphericat one of 56 L with central ignition that can be heated to 200°C and a large one optimised for flame acceteration (ENACCEF). With these toots have been determined the f1ammabil1ty limits of H2/air/water vapor as a function of pressure and temperature, the behavior of flames close to the limits, the effect of sprinkling on desinerting and finaUy the interaction between the flame front and the droplets considering different mean droplets sizes. The influence of a hydrogen concentration gradient on the acceleration criterion and the role of sprinkling on the propagation of a turbulent flame have also been studied. It appears that the spray can cause not only desinerting but also be ineffective in extinguishing the flame and, in sorne cases, can even increase the turbulence rate and consequently the flame acceleration process.

Send Print

Contact

Ahmed Bentaïb, the thesis supervisor
Claude-Etienne Paillard, the thesis director

More informations

Thesis report


Close

Send to a friend

The information you provide in this page are single use only and will not be saved.
* Required fields

Recipient's email:*  

Sign with your name:* 

Type your email address:*   

Add a message :

Do you want to receive a copy of this email?

Send

Cancel

Close

WP_IMPRIMER_TITLE

WP_IMPRIMER_MESSAGE

Back

Ok