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Etude sur le mécanisme de l'écoulement critique à cavitation dans des pompes à éjection dans certaines limites de fonctionnement.

Investigation on mechanism of critical cavitating flow in liquid jet pumps under operating limits.

Auteurs : LONG X., YAO H., ZHAO J.

Type d'article : Article

Résumé

The critical cavitating flow in liquid jet pumps under operating limits is investigated in this paper. Measurements on the axial pressure distribution along the wall of jet pumps indicate that two-phase critical flow occurs in the throat pipe under operating limits. The entrained flow rate and the distribution of the wall pressure upstream lowest pressure section does not change when the outlet pressure is lower than a critical value. A liquid-vapour mixing shockwave is also observed under operating limits. The wave front moves back and forth in low frequency around the position of the lowest pressure. With the measured axial wall pressures, the Mach number of the two-phase cavitating flow is calculated. It's found that the maximum Mach number is very close to 1 under operating limits. Further analysis infers a cross-section where Mach number approaches to 1 near the wave front. Thus, the liquid-vapour mixture velocity should reach the local sound velocity and resulting in the occurrence of operating limits. [Reprinted with permission from Elsevier. Copyright, 2008].

Détails

  • Titre original : Investigation on mechanism of critical cavitating flow in liquid jet pumps under operating limits.
  • Identifiant de la fiche : 2009-2039
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 52 - n. 9-10
  • Date d'édition : 04/2009
  • DOI : http://dx.doi.org/10.1016/j.ijheatmasstransfer.2008.11.018

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