contribution a l'étude de l'érosion de cavitation - Infoscience - EPFL

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Nomenclature Ce Vitesse a l'entree de la veine d'essai du GTC [m/s] Cs Celerite duson [m/s] Cc Vitesse de deplacement de l'interface eau-vapeur [m/s] Cref Vitesse de reference [m/s] Cparoi Vitesse a la paroi [m/s] De Diametre du conduit d'amenee du GTC [m] Ef Potentiel erosif [J] Hs Hauteur d'implantation d'une pompe [m] H Module de la fonction de transfert [dB] M Nombre de Mach [-] NPSH Hauteur nette d'aspiration d'une pompe [m] O2 Teneur en oxygene dissous [ppm] Perf Puissance erosive [W] Q Debit [m 3 /s] Re Nombre de Reynolds [-] S Nombre de Strouhal [-] T Temperature de l'eau d'essai [ C] Vf Volume d'une cavite transitoire [m 3 ] Vf Volume moyen des cavites transitoires [m 3 ] a Celerite du son dans l'eau [m/s] cp Coe cient de pression, cp = p;pref 1 2 Cref 2 [-] cpf Coe cient de pression dans la fermeture de la poche [-] f Frequence [Hz] fc Frequence de l^acher des cavites erosives [Hz] g Acceleration de la pesanteur [m/s 2 ] i Incidence du pro l experimental [ ] ia( ) Incidence du pro l correspondant audebut de la cavitation [ ] pour un coe cient decavitation xe l Longueur de la poche de cavitation [m] p Pression [Pa] pa Pression atmospherique [Pa] pi Pression mesuree par le capteur N i [Pa] pv Pression de vapeur saturante [Pa] t Temps [s] x(t)y(t) Signaux reels aenergie nie [-] ^x(t) Transformee de Hilbert du signal x(t) [-] (x y) Fonction de coherence relative aux signaux x et y [-] ! Vitesse angulaire [rd/s] Coe cient de pertes de charges [-] Masse volumique de l'eau d'essai [kg/m 3 ] EPFL { DGM { IMHEF 22
Chapitre 0 Coe cient decavitation, = pref ; pv 1 2 Cref 2 [-] ; Circulation de la vitesse [m 2 /s] Viscosite cinematique de l'eau [m 2 /s 2 ] Abbreviations: rms Root Mean Square (ecart type) CAMAC Computer Automated Measurement And Control DIN Deutsche Industrienormen EPFL Ecole Polytechnique Federale de Lausanne GPIB General Purpose Interface Bus GTC Generateur de Tourbillons de Cavitation IMHEF Institut de Machines Hydrauliques et de Mecanique des Fluides ISO International Standardisation Organization NFS Network File System NPSH Net Positive Suction Head TCP/IP Transmission Control Protocol / InterNet Protocol T F Transformee de Fourier T FG Transformee afen^etre glissante 23
Page 1: CONTRIBUTION A L'ÉTUDE DE L'ÉROSI
Page 4 and 5: le processus de generation des cavi
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Page 10 and 11: 2.5.1 Position du probleme : : : :
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