scholarly journals Rotating Flow in Suction Pipe of Centrifugal Pump : 1st Report Velocity and Energy Distribution

1965 ◽  
Vol 31 (227) ◽  
pp. 1090-1098 ◽  
Author(s):  
Mitsukiyo MURAKAMI ◽  
Naomichi HEYA
Keyword(s):  
Energy Distribution ◽  
Centrifugal Pump ◽  
Rotating Flow ◽  
Suction Pipe

Experimental Study of the Flow in the Suction Pipe of a Centrifugal Pump at Partial Flow Rates in Unsteady Conditions

1999 ◽  
Vol 121 (3) ◽  
pp. 291-295 ◽  
Author(s):  
S. Bolpaire ◽  
J. P. Barrand
Keyword(s):  
Centrifugal Pump ◽  
Flow Rate ◽  
Static Pressure ◽  
Pressure Measurements ◽  
Flow Rates ◽  
Suction Pipe ◽  
Start Up ◽  
Test Loop ◽  
Fast Start ◽  
Operational Range

The operational range and the performances of pumps are limited by the occurrence of backflow and prerotation in the suction pipe as the flow rate is reduced. This paper presents the study of static pressure measurements and visualizations in the suction pipe, near the inlet of a centrifugal pump, at partial flow rates, in steady conditions, and during a fast start-up of the pump. The tests were carried out in water on the DERAP© test loop of the ENSAM Lille laboratory. Standard methods allowed to determine the recirculation critical flow rate. A visualization method showed that the axial extent of the recirculation and the prerotation with the flow rate is considerably reduced during a fast start-up compared to steady conditions.

Interrelation Between Fluid Particles Rotational Motion in Rotating Flow Passage of Centrifugal Pump and Overall Efficiency

Volume 3 ◽  
2004 ◽  
Author(s):  
Takaharu Tanaka ◽  
Chao Liu
Keyword(s):  
Centrifugal Pump ◽  
Rotational Motion ◽  
Rotating Flow ◽  
Energy Losses ◽  
Trailing Edge ◽  
Flow Passage ◽  
Impeller Outlet ◽  
Overall Efficiency ◽  
Fluid Particles ◽  
The Way

Main purpose of investigation has been put on the hydraulic energy losses caused in the rotating flow passage of centrifugal pump. Result of discussion shows that fundamental poor efficiency is brought by the fluid particles poor rotational motion at the trailing edge of impeller outlet, including the rotational motion caused in the flow passage between impeller blades rather than the hydraulic energy losses caused in the rotating flow passage. Therefore, our main purpose of investigation has to be put on the way rather to the fluid particles rotational motion caused at the trailing edge of impeller outlet and that caused between impeller blades.

An Investigation on Real and Imaginary Energy Transfer Mechanism Caused in Rotating Flow Passage of Centrifugal Pump

2005 ◽  
Author(s):  
Takaharu Tanaka ◽  
Chao Liu
Keyword(s):  
Energy Transfer ◽  
Physical Properties ◽  
Centrifugal Pump ◽  
Rotational Motion ◽  
Rotating Flow ◽  
Physical Parameters ◽  
Energy Transfer Mechanism ◽  
Flow Passage ◽  
Different Types ◽  
Force Velocity

Hydraulic energy is constructed from real and imaginary energies. Their acting directions are normal to each other. Their physical properties are quite different. All the physical parameters, such as force, velocity, and acceleration therefore consist of two different type real and imaginary functions. Physically, there are three different types of fluid particles rotational motion: straightly forward non-rotational motion, which is based upon kinetic real physical parameters, circularly forward rotational motion, which is based upon un-kinetic imaginary physical parameters, and their combined rotational motion. Their interrelation is shown in diagram.

Forced and Self-Excited Oscillations in Propellant Lines

1969 ◽  
Vol 91 (4) ◽  
pp. 671-677 ◽  
Author(s):  
W. Zielke ◽  
E. B. Wylie ◽  
R. B. Keller
Keyword(s):  
Centrifugal Pump ◽  
Hydraulic System ◽  
Analytical Techniques ◽  
Experimental Results ◽  
Distributed Parameter ◽  
Rocket Engines ◽  
Pressure Oscillations ◽  
Discharge Pipe ◽  
Suction Pipe ◽  
Parameter Representation

Analytical techniques used to model the dynamics of propellant feed systems of rocket engines are presented as well as experimental results which provide verification. The laboratory hydraulic system, consisting of suction pipe, centrifugal pump, and discharge pipe, provides longitudinal fluid oscillations which are analyzed by use of linear methods employing a distributed parameter representation of the pipes. Of particular interest is the effect of the pump upon pressure oscillations when the pump is operating under cavitating conditions. A self-excited instability caused by the interaction between hydraulic and structural portions of the system is also described.

Simulation on the Flow Field of Centrifugal Pump Based on Fluent

2014 ◽  
Vol 926-930 ◽  
pp. 1743-1746
Author(s):  
An Fu Guo ◽  
Tong Wang ◽  
Ting Ting Jiang ◽  
Yun Ping Hu ◽  
Da Jiang Zhang
Keyword(s):  
Kinetic Energy ◽  
Flow Field ◽  
Energy Distribution ◽  
Turbulent Kinetic Energy ◽  
Centrifugal Pump ◽  
Flow Distribution ◽  
Kinetic Energy Distribution ◽  
Two Dimensional ◽  
Two Dimensional Flow ◽  
Velocity Pressure

In this paper, the software Fluent was employed and the two-dimensional flow fields, such as flow distribution, velocity distribution, pressure distribution, turbulent kinetic energy distribution are obtained. The results show that the flow, velocity, pressure and turbulent kinetic energy distribution are significantly different and asymmetric. The results have referenced significance for design and analysis of the Centrifugal Pump.

CFD Simulation and Design Improvement of Internal Rotating Flow of Turbomachine

2020 ◽  
Author(s):  
Naseer Hadi ◽  
Badih Jawad ◽  
Munther Hermez ◽  
Hossam Metwally ◽  
Liping Liu
Keyword(s):  
Flow Field ◽  
Centrifugal Pump ◽  
High Speed ◽  
Cfd Simulation ◽  
Stokes Equations ◽  
Normal Operation ◽  
Working Fluid ◽  
Centrifugal Impeller ◽  
Rotating Flow ◽  
Pump Performance

Abstract Designing a turbomachine comes with many challenges due to many parameters affecting its performance. This study presents a design to reduce losses in turbulence flow and surface friction by using a disk located between the rotating centrifugal impeller and the pump casing, which in turn enhances the centrifugal pump performance, upon rotating freely during normal operation. Under a constant operating speed of 3000 RPM, the new design is shown to improve the centrifugal pump performance. The turbulent flow between the rotating impeller and pump stationary walls increases the frictional losses. The highest friction occurs in the flow between two surfaces, one being close to zero velocity and the other one moving at high speed. Flow recirculation in the enclosure is a major problem that leads to a decrease in turbomachine’s performance. Two-dimensional Computational Fluid Dynamics (CFD) analysis is used to numerically simulate the rotating flow field inside the centrifugal pump chamber and to provide critical hydraulic design information. In this study, ANSYS-FLUENT R19.2 is used to analyze the input torque under different angular velocities by applying a disk with various thicknesses at four different locations to get the best results. The flow field in the chamber is investigated using 2-D Naiver-Stokes Equations with a Realizable k-ϵ turbulence model. Standard water was used as the working fluid. The numerical analysis gives an idea of how the freely rotating disks behave, and the results will be compared to find the most efficient case of centrifugal pump operation with an adjacent disk. The best-case new design will identify the highest reduction of input power by 24.4%. This study will introduce to the future work of a three-dimensional model.

A Consideration on Energy Transfer Mechanism Caused Between Impeller Blade and a Fluid Particle in Centrifugal Pump

2002 ◽  
Author(s):  
Takaharu Tanaka
Keyword(s):  
Centrifugal Pump ◽  
Centrifugal Force ◽  
Flow Rate ◽  
Fluid Particle ◽  
Rotating Flow ◽  
Energy Transfer Mechanism ◽  
Forward Movement ◽  
Impeller Blade ◽  
Impeller Outlet ◽  
Centripetal Forces

Impeller blade’s rotational motion causes centrifugal force on fluid particle. It directs radial outward. However, the flow rate, that is, radial outward flow is not caused by centrifugal force in centrifugal pump. Tangential forward force, which is in the direction perpendicular to rotational radius, causes tangential forward movement on fluid particle under the radial balance of centrifugal and centripetal forces in the rotating flow passage of centrifugal pump and it causes the flow rate. And the head is caused by centrifugal force and equivalent to centripetal force, which acts on fluid particle radial inward. Which is equivalent to external force at the trailing edge of impeller outlet.

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