A high-speed centrifugal pump is the key facility to deliver oil in an aero-engine. The stable operation quite important safety of engine. High-speed stability essentially caused by transient pressure pulsations excited complex flow within pump, which needs be clarified, especially for under a rotating stall condition. In current research, unsteady pulsation and corresponding distribution are a...

The impeller of double-suction centrifugal fans may be radially offset from the centerline volute due to faults in assembly or installation. radial results more significant non-uniformity internal flow fan, which is biased designed condition, and deteriorates aerodynamic performances fan. In this paper, we performed Unsteady Reynolds-averaged Navier–Stokes (URANS) simulations on unsteady a fan ...

In the present work, effects of modifying tongue geometry a centrifugal pump on pressure pulsations under design and off-design conditions are carried out numerically by unsteady analysis fluid flow. Numerical modeling based Re-Normalization Group (RNG) k-ε turbulence model using Mosaic mesh structure, technology which can easily, quickly formally connects any type for complex geometries flow r...

A double-volute molten salt pump with two outlet pipes is proposed based on the original model. numerical approach coupling finite element analysis and computational fluid dynamics (CFD) implemented to investigate operational stability energy performance of centrifugal pumps for high-temperature salt. The entropy production single-volute investigated. effects volute structures mechanical behavi...

During the startup process of a centrifugal pump, vibration and noise problems caused by unsteady flow are focus attention, pressure pulsation is one main reasons for this problem. In current research, special impeller with blade side trimming was proposed to reduce strong phenomenon during pumps. This article uses numerical simulation methods simulate three typical trailing edges: original edg...

Three devices for treating contaminated water using a cavitating vortex have been developed and tested. The first device uses stationary twin volute casings to generate cavitating vortices. Observation of the collisions among the opposing counter-rotating vortices revealed that their end portions whirl, that the vortices never collide head-on, and that they eventually separate into several smal...

Measurements of the time-varying flow in a centrifugal blood pump operating as a left ventricular assist device (LVAD) are presented. This includes changes in both the pump flow rate as a function of the left ventricle contraction and the interaction of the rotating impeller and fixed exit volute. When operating with a pulsing ventricle, the flow rate through the LVAD varies from 0-11 L/min dur...

In order to study pressure fluctuation characteristics of a centrifugal pump as turbine (PAT) in its start-up process, Fluent was used do numerical simulation the PAT process. Time and frequency domain analyses were performed on data acquired at different positions heads. The results show that large number low-pressure areas strong vortexes are formed within impeller initial time start-up. With...