3D Unsteady Flow and Forces in Centrifugal Impellers With Circumferential Distortion of the Outlet Static Pressure

1995 ◽  
Author(s):  
Antonios Fatsis ◽  
Stephane Pierret ◽  
René Van den Braembussche
Keyword(s):  
Flow Field ◽  
Unsteady Flow ◽  
Parametric Study ◽  
Static Pressure ◽  
Centrifugal Impeller ◽  
Radial Forces ◽  
3D Unsteady Flow ◽  
Euler Solver ◽  
Impeller Geometry ◽  
Negligible Influence

This paper describes the numerical investigation of the centrifugal impeller response to downstream static pressure distortions imposed by volutes at off-design operations. An unsteady 3D Euler solver with non-reflecting upstream and downstream boundary conditions and phase-lagged periodicity conditions is used for this purpose. The mechanisms governing the unsteady flow field are analysed. A parametric study shows the influence of the acoustic Strouhal number on the amplitude of the flow perturbations. Radial forces calculated on backward leaned and radial ending centrifugal impellers, show non-negligible influence of the impeller geometry.

Three-Dimensional Unsteady Flow and Forces in Centrifugal Impellers With Circumferential Distortion of the Outlet Static Pressure

1997 ◽  
Vol 119 (1) ◽  
pp. 94-102 ◽  
Author(s):  
A. Fatsis ◽  
S. Pierret ◽  
R. Van den Braembussche
Keyword(s):  
Flow Field ◽  
Boundary Conditions ◽  
Unsteady Flow ◽  
Parametric Study ◽  
Static Pressure ◽  
Three Dimensional ◽  
Centrifugal Impeller ◽  
Radial Forces ◽  
Euler Solver ◽  
Impeller Geometry

This paper describes the numerical investigation of the centrifugal impeller response to downstream static pressure distortions imposed by volutes at off-design operations. An unsteady three-dimensional Euler solver with nonreflecting upstream and down-stream boundary conditions and phase-lagged periodicity conditions is used for this purpose. The mechanisms governing the unsteady flow field are analyzed. A parametric study shows the influence of the acoustic Strouhal number on the amplitude of the flow perturbations. Radial forces calculated on backward leaned and radial ending centrifugal impellers show nonnegligible influence of the impeller geometry.

scholarly journals Numerical Calculation of Secondary Flow in Pump Volute and Circular Casings using 3D Viscous Flow Techniques

2000 ◽  
Vol 6 (4) ◽  
pp. 245-252 ◽  
Author(s):  
K. Majidi ◽  
H. E. Siekmann
Keyword(s):  
Flow Field ◽  
Static Pressure ◽  
Frame Of Reference ◽  
Centrifugal Impeller ◽  
Pressure Gradients ◽  
Cross Sectional ◽  
Stationary Frame ◽  
Multiple Frame ◽  
Secondary Velocity ◽  
Flow Techniques

The flow field in volute and circular casings interacting with a centrifugal impeller is obtained by numerical analysis. In the present study, effects of the volute and circular casings on the flow pattern have been investigated by successively combining a volute casing and a circular casing with a single centrifugal impeller. The numerical calculations are carried out with a multiple frame of reference to predict the flow field inside the entire impeller and casings. The impeller flow field is solved in a rotating frame and the flow field in the casings in a stationary frame. The static pressure and velocity in the casing and impeller, and the static pressures and secondary velocity vectors at several cross-sectional planes of the casings are calculated. The calculations show that the curvature of the casings creates pressure gradients that cause vortices at cross-sectional planes of the casings.

Experimental investigation of the 3D unsteady flow field downstream of axial fans

2006 ◽  
Vol 17 (5) ◽  
pp. 303-314 ◽  
Author(s):  
Gérald Kergourlay ◽  
Smaïne Kouidri ◽  
Gary W. Rankin ◽  
Robert Rey
Keyword(s):  
Experimental Investigation ◽  
Flow Field ◽  
Unsteady Flow ◽  
Axial Fans ◽  
3D Unsteady Flow

Analysis and Numerical Simulation of Flow Field in Centrifugal Pump

2014 ◽  
Vol 1006-1007 ◽  
pp. 131-134
Author(s):  
Yi Jun Zhou ◽  
Hai Yang Xu ◽  
Wang Kan
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Centrifugal Pump ◽  
Static Pressure ◽  
Three Dimensional ◽  
Centrifugal Impeller ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Design And Optimization ◽  
Fluent Software

The inner flow field of centrifugal pump is complex and presents a characteristic of three-dimensional turbulence. Used Solidworks software to establish a three-dimensional model of the pump and impeller, completed the numerical simulation of centrifugal impeller flow field based on the turbulence model and Fluent software, obtained the static pressure and velocity distribution of flow field, provided basis for the design and optimization of the subsequent product.

A parametric study of the effects of unsteady wake passing on the flow field in a compressor cascade

1996 ◽  
Author(s):  
Daniel Dorney ◽  
Aaron Mosebach ◽  
Douglas Sondak ◽  
Mark Barnett
Keyword(s):  
Flow Field ◽  
Parametric Study ◽  
Compressor Cascade ◽  
Unsteady Wake ◽  
Wake Passing

Modal characteristics and fluid–structure interaction vibration response of submerged impeller

2021 ◽  
pp. 107754632110036
Author(s):  
Shihui Huo ◽  
Hong Huang ◽  
Daoqiong Huang ◽  
Zhanyi Liu ◽  
Hui Chen
Keyword(s):  
Flow Field ◽  
Unsteady Flow ◽  
Damping Ratio ◽  
Pure Water ◽  
Vibration Response ◽  
Modal Identification ◽  
Liquid Oxygen ◽  
Modal Characteristics ◽  
Oxygen Pump ◽  
Turbo Pump

Turbo pump is one of the elements with the most complex flow of liquid rocket engine, and as an important component of turbo pump, an impeller is the weak point affecting its reliability. In this study, a noncontact modal characteristic identification technique was proposed for the liquid oxygen pump impeller. Modal characteristics of the impeller under three different submerged media, air, pure water, and brine with same density as liquid oxygen, were tested based on the noncontact modal identification technology. Submersion state directly affects the modal frequencies and damping ratio. The transient vibration response characteristics of the impeller excited by the unsteady flow field was achieved combining with unsteady flow field analysis and transient dynamic analysis in the whole flow passage of the liquid oxygen pump. Vibration responses at different positions of the impeller show 10X and 20X frequencies, and the amplitude at the root of short blade is significant, which needs to be paid more attention in structural design and fatigue evaluation.

Unsteady Flow Phenomena in Rotating Centrifugal Impeller Passages

1970 ◽  
Vol 92 (1) ◽  
pp. 65-71 ◽  
Author(s):  
E. Lennemann ◽  
J. H. G. Howard
Keyword(s):  
Unsteady Flow ◽  
Secondary Flow ◽  
Centrifugal Impeller ◽  
Bubble Flow ◽  
Hydrogen Bubble ◽  
Visualization Technique ◽  
Rotating Systems ◽  
Flow Phenomena ◽  
Relative Flow ◽  
Zero Flow

The phenomena of unsteady relative flow observed in a centrifugal impeller passage running at part capacity and zero flow are discussed. The mechanisms of passage stall for a shrouded and unshrouded impeller are investigated and a qualitative correlation is developed for the influence of secondary flow and inducer flow on the passage stall. The hydrogen bubble flow visualization technique is extended to higher velocities and rotating systems and provides the method for obtaining the experimental results.

scholarly journals Analysis of Unsteady Flow Field in Rotating Detonation Turbine Engine

2021 ◽  
Vol 1750 ◽  
pp. 012070
Author(s):  
Bing Ji ◽  
Zhiduo Wang ◽  
Jun Li
Keyword(s):  
Flow Field ◽  
Unsteady Flow ◽  
Turbine Engine ◽  
Rotating Detonation

Effects of Flue Gas Inlet Structure on the Flow Field Characteristics of Multi-Stage Liquid Column Scrubber

2013 ◽  
Vol 773 ◽  
pp. 749-754
Author(s):  
Zhen Ya Duan ◽  
Fu Lin Zheng ◽  
Hui Ling Shi ◽  
Jun Mei Zhang
Keyword(s):  
Flow Field ◽  
Flue Gas ◽  
Static Pressure ◽  
Liquid Column ◽  
Liquid Distribution ◽  
Multi Stage ◽  
Flow Field Characteristics ◽  
Wall Flow ◽  
Two Peaks ◽  
Saddle Shape

In this paper, the numerical model of multi-stage liquid column scrubber was established. The flow field of liquid column scrubber with different inlet structure was respectively simulated by a commercial CFD code, Fluent. Considering the distribution characteristics of static pressure and velocity in the scrubber, this inlet type, single horizontal gas inlet with a notch at the bottom, is regarded as the most reasonable structure. On one hand, that structure has uniform distribution of static pressure. On the other hand, the velocity profile of its field presents saddle shape, i.e. the low central velocity exists between two peaks, which could contribute to weakening wall-flow phenomenon and obtaining uniform gas-liquid distribution.

scholarly journals Unsteady flow field around a human hand and propulsive force in swimming

2009 ◽  
Vol 42 (1) ◽  
pp. 42-47 ◽  
Author(s):  
K. Matsuuchi ◽  
T. Miwa ◽  
T. Nomura ◽  
J. Sakakibara ◽  
H. Shintani ◽  
...  
Keyword(s):  
Flow Field ◽  
Unsteady Flow ◽  
Human Hand ◽  
Propulsive Force
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