Rotating stalls are generally the first instability met in turbomachinery, before surges. This 3D phenomenon is characterized by one or more stalled flow cells which rotate at a fraction of the impeller speed. The goal of the present work is to shed some light on the entropy generation in a centrifugal fan under rotating stall conditions. A numerical simulation of entropy generation is carried ...

Pressure fluctuation may cause high amplitude of vibration of double‐suction centrifugal pumps, but the impact of impeller stagger angles is still not well understood. In this paper, pressure fluctuation experiments are carried out for five impeller configurations with different stagger angles by using the same test rig system. Results show that the stagger angles exert negligible effects on th...

an optimal design and fabrication of compressors requires flow investigation through the compressor components. flow field inside the volute is fully three dimensional and turbulent. better understanding of flow mechanism leads to improve the volute design procedure. in this research the experimental and numerical flow investigation through a radial flow compressor volute are performed to recog...

Abstract This paper mainly based on the CFD platform, numerical simulation of internal flow field in open-design vortex pump under different solid particle concentration and size is carried out to explore trajectory characteristics particles impeller channel lateral cavity, as well distribution particles, calculate sliding velocity channel. The results show that at concentrations, volume fracti...

Based on the three-dimensional elliptic governing equations and the throttle model, an unsteady numerical simulation of rotating stall is undertaken in the case of G4-73 type centrifugal fan and the correctness of simulation results is verified by experiments. In this study a new rotating stall inception criterion is put forward, that the inlet flow or outlet back pressure fluctuations graduall...

A nite element based method has been developed for computing time-averaged uid-induced radial excitation forces and rotor dynamic forces on a two-dimensional centrifugal impeller rotating and whirling in a volute casing. In this method potential ow theory is used, which implies the assumption of irrotational inviscid ow. In comparison with other analyses of uid-induced impeller forces, two main...

In order to discuss the surface pressure pulsation characteristics of magnetic-fluid sealing membrane centrifugal pump, this paper studies shaft end under different flow operating conditions pump based on combination numerical calculation and experimental verification. The results show that value film decreases with increase rate has periodic pulsation, period is time required for a single blad...

Abstract In new energy vehicles, due to the loss of traditional engine noise source coverage, air conditioning blower has become main noises. this work, simulation radius volute tongue (R), gap tongue(d), blade outlet angle (β) and profile(A) were conducted obtain influence degree each parameter on aerodynamic efficiency blower, numerical methods which verified by experimental test. A global se...

In this study, optimization of the impeller and design of volute were carried out in order to improve the performance of a centrifugal pump. Design parameters from vane plane development for impeller design were selected and effect of the design parameters on the performance of the pump was analyzed using CFD and Response Surface Method to optimized impeller. This study also proposed the optimi...

In order to improve the operation performance of multi-stage double-suction centrifugal pump and reduce internal energy loss pump, this paper proposes a single-objective optimization design method based on non-hierarchical response surface methodology (RSM) multi-island genetic algorithm (MIGA). Nine parameters, such as blade outlet width wrap angle, were used variables, objective was efficienc...