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Experimental and numerical analysis of behavior of electromagnetic annular linear induction pump

Creators

Description

The research explores the issue of magnetohydrodynamic (MHD) instability in electromagnetic induction pumps with focus on the regimes of high slip Reynolds magnetic number (Rms) in Annular Linear Induction Pumps (ALIP) operating with liquid sodium. The context of the thesis is French GEN IV Sodium Fast Reactor research and development program for ASTRID in a framework of which the use of high discharge ALIP in the secondary cooling loops is being studied. CEA has designed, realized and will exploit PEMDYN facility, able to represent MHD instability in high discharge ALIP. In the thesis stability of an ideal ALIP is elaborated theoretically using linear stability analysis. Analysis revealed that strong amplification of perturbation is expected after convective stability threshold is reached. Theory is supported with numerical results and experiments reported in literature. Stable operation and stabilization technique operating with two frequencies in case of an ideal ALIP is discussed and necessary conditions derived. Detailed numerical models of flat linear induction pump (FLIP) taking into account effects of a real pump are developed. New technique of magnetic field measurements has been introduced and experimental results demonstrate a qualitative agreement with numerical models capturing all principal phenomena such as oscillation of magnetic field and perturbed velocity profiles. These results give significantly more profound insight in the phenomenon of MHD instability and can be used as a reference in further studies. (author)

Abstract (French)

La recherche actuelle dans le domaine des pompes a induction electromagnetique s'oriente sur la question de l'instabilite MagnetoHydroDynamique (MHD) avec un interet particulier pour les regimes a haut nombre de Reynolds magnetique de glissement (Rms). Notre etude se focalise sur les pompes a induction lineaires annulaires (ALIP) fonctionnant avec du sodium liquide. La these s'inscrit dans le contexte du programme francais de recherche et developpement de reacteur rapide en sodium de la GEN IV. Pour le demonstrateur ASTRID, l'utilisation d'une ALIP a haut debit dans les boucles de refroidissement secondaires est identifiee. Le CEA, a concu, realise et exploitera la boucle PEMDYN, representative d'instabilites MHD a hauts debits. Dans cette etude, la stabilite d'une ALIP ideale est abordee du point de vue theorique en se focalisant sur l'analyse de la stabilite lineaire. L'analyse a revele que la forte amplification de la perturbation est attendue lorsque le seuil de stabilite convective est atteint. La theorie est soutenue par les resultats numeriques et des experiences rapportees dans la litterature. Le fonctionnement stable et les moyens de stabilisation jouant avec deux frequences dans le cas d'une ALIP ideale est discute et les conditions necessaires obtenues. Des modeles numeriques detailles de pompe plate a induction lineaire (FLIP) en tenant compte des phenomenes d'une veritable pompe sont developpes. Une nouvelle technique de mesures du champ magnetique est introduite et les resultats experimentaux demontrent un accord qualitatif avec des modeles numeriques permettant de capturer tous les phenomenes principaux tels que l'oscillation du champ magnetique et les profils de vitesse perturbee. Ces resultats precisent les phenomenes d'instabilite MHD qui peuvent etre rencontres et peuvent etre utilises en tant que reference dans des etudes ulterieures

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Additional details

Additional titles

Original title (English)
Analyse experimentale et numerique du comportement electromagnetique de pompe a induction lineaire annulaire

Identifiers

URL
http://www.iaea.org/inis/Contacts/; http://sicd1.ujf-grenoble.fr/;

Publishing Information

Imprint Pagination
174 p.
Report number
FRCEA-TH--7434

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
47082337
Subject category
S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Resource subtype / Literary indicator
Thesis
Descriptors DEI
ELECTROMAGNETISM; FAST REACTORS; INSTABILITY; MAGNETIC REYNOLDS NUMBER; MAGNETOHYDRODYNAMICS; PUMPS; SODIUM; SODIUM COOLED REACTORS
Descriptors DEC
ALKALI METALS; DIMENSIONLESS NUMBERS; ELEMENTS; EPITHERMAL REACTORS; EQUIPMENT; FLUID MECHANICS; HYDRODYNAMICS; LIQUID METAL COOLED REACTORS; MAGNETISM; MECHANICS; METALS; REACTORS; REYNOLDS NUMBER

Optional Information

Notes
65 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS-NKM web site for current contact and E-mail addresses: http://www.iaea.org/inis/Contacts/; Also available from http://sicd1.ujf-grenoble.fr/ (France)