Study of the internal flow field in a pump-as-turbine (PaT): Numerical investigation, overall performance prediction model and velocity vector analysis

Numerical investigations of internal flow field in centrifugal compressor impeller channel are carried out in this paper. Topological analyses of limit streamline pattern are used to interpret the Jet-Wake formation. With such a technique, it can give a clearly description of the wake. And the shape of the wake, the wake onset and wake developing process are depicted in detail. The numerical results also present the internal vortices, secondary flows and their effects on the Jet-Wake pattern formation. The influences of Coriolis force on flow field of the centrifugal impeller are also discussed.

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Numerical Simulation and Experiment Research of the Whole Flow Field inside a Multi-Blade Centrifugal Fan

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.468-471.2255 ◽

2012 ◽

Vol 468-471 ◽

pp. 2255-2258

Author(s):

Feng Gao ◽

Wei Yan Zhong

Keyword(s):

Numerical Simulation ◽

Flow Field ◽

Field Model ◽

Pressure Field ◽

Internal Flow ◽

Centrifugal Fan ◽

Simulation And Experiment ◽

Overall Performance ◽

Unsteady Numerical Simulation ◽

Cfd Method

The full flow field model of a widely used multi-blade centrifugal was built, using the CFD method, the steady and unsteady numerical simulation of the inner flow in the fan at different working conditions are presented. The numerical simulation results were validated by contrasting to the experiment results. The results displayed the characteristics of the velocity field, pressure field and pressure fluctuate in the centrifugal fan. The results can provide basis for optimizing the fan design and the internal flow, and have important value of engineering applications in the increase of the overall performance in operation.

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Numerical Simulation of the 3D Turbulent Flow Field in a Cross-Flow Fan Used in the Air Conditioner

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.538-541.462 ◽

2012 ◽

Vol 538-541 ◽

pp. 462-465 ◽

Cited By ~ 3

Author(s):

Yong Chao Zhang ◽

Qing Guang Chen ◽

Wei Bin Wang ◽

Bin Xie

Keyword(s):

Numerical Simulation ◽

Flow Field ◽

Turbulent Flow ◽

3D Model ◽

Cross Flow ◽

Internal Flow ◽

Air Conditioner ◽

Full Field ◽

Overall Performance ◽

Cross Flow Fan

Aiming at a cross-flow fan used in some kind of air conditioner, the full field 3D model was built, and the numerical simulation of the inner turbulent flow under design condition is resented. The results display the characteristics of flow field in the cross-flow fan, especially the velocity field, pressure field and the velocity distributing before the evaporator. The results can provide basis for optimizing the fan design and the internal flow, and have important value of engineering applications in the increase of the overall performance in operation.

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Numerical Simulation and Performance Prediction of Multistage Canned Motor Pump

Volume 1A, Symposia: Turbomachinery Flow Simulation and Optimization; Applications in CFD; Bio-Inspired and Bio-Medical Fluid Mechanics; CFD Verification and Validation; Development and Applications of Immersed Boundary Methods; DNS, LES and Hybrid RANS/LES Methods; Fluid Machinery; Fluid-Structure Interaction and Flow-Induced Noise in Industrial Applications; Flow Applications in Aerospace; Active Fluid Dynamics and Flow Control — Theory, Experiments and Implementation ◽

10.1115/fedsm2016-7644 ◽

2016 ◽

Author(s):

Bin Xia ◽

Fan-Yu Kong ◽

Yuxing Bai ◽

Xiaohui Duan

Keyword(s):

Numerical Simulation ◽

Flow Field ◽

Performance Prediction ◽

Three Dimensional ◽

Internal Flow ◽

Main Flow ◽

Three Dimensional Model ◽

Local Flow ◽

And Performance ◽

Canned Motor

Due to the advantages of high head and no leakage, multistage canned motor pump is widely used in oil industry, chemical industry, national defense and atomic energy. In order to meet the needs of the market, the multistage canned motor pump is designed. This paper introduced the hydraulic design and structural design. In order to optimizing the performance of the pump, this paper designed and used multistage canned motor pump DBP15–50×8 as the research object. Three-dimensional model of the main flow passage components is built and the mesh is generated respectively by using Pro/E and ICEM software, and we calculated the whole internal flow field of the pump that was selected by using ANSYS CFX14.0 software, achieving the pressure and velocity distribution in the pump and the internal details of flow in impeller and other main flow components. The post-processing showed the fluid in sliding bearing section rotates around the shaft, so the local flow is disorder. The comparison of the performance prediction and the experiment shows that the error is low. The cavitating turbulent flow in the flow field was numerically simulated by using the cavitation model. The cavitation phenomena didn’t occur in the experiments. The condition meets the result of numerical simulation.

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The Internal Flow Field and Overall Performance of a Centrifugal Fan Impeller: Experiment and Prediction

1982 Joint Power Generation Conference: GT Papers ◽

10.1115/82-jpgc-gt-16 ◽

1982 ◽

Cited By ~ 1

Author(s):

T. Wright ◽

K. T. S. Tzou ◽

K. W. Greaves ◽

S. Madhavan

Keyword(s):

Flow Field ◽

Flow Behavior ◽

Internal Flow ◽

Inviscid Flow ◽

Industrial Applications ◽

Centrifugal Fan ◽

Power Utility ◽

Pressure Losses ◽

Discharge Velocity ◽

Overall Performance

Analytical and experimental procedures for determining the detailed internal flow behavior in the impeller of a centrifugal fan are presented. Predicted and measured values of both the detailed flow fields and overall performance of the impeller are shown to be in good agreement. The analytical procedures are based on a finite element method to predict the inviscid flow field, coupled to a semi-empirical determination of pressure losses in the impeller based on boundary layer calculations. The experimental work used to validate these predictions uses extensive surface pressure taps in the rotating impeller as well as information from inlet and discharge velocity traverses to determine overall performance. The purpose of this work is the development of accurate and reliable analytical tools for the design of air and gas moving equipment with improved performance and efficiency for the power utility market and heavy industrial applications.

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THE INTERNAL FLOW FIELD ASSOCIATED WITH YAWED THREE-DIMENSIONAL RECTANGULAR CAVITIES

Journal of Flow Visualization and Image Processing ◽

10.1615/jflowvisimageproc.v7.i3.30 ◽

2000 ◽

Vol 7 (3) ◽

pp. 14

Author(s):

Eric Savory ◽

Norman Toy ◽

Shiki Okamoto ◽

Yoko Yamanishi

Keyword(s):

Flow Field ◽

Three Dimensional ◽

Internal Flow

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Numerical Investigation of Flow Field Near the Exhaust Opening Indoor

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/267/3/032081 ◽

2019 ◽

Vol 267 ◽

pp. 032081

Author(s):

Chanjun Meng ◽

Bo Yuan ◽

Chuan He ◽

Chunfu Xi ◽

Liangming Pan

Keyword(s):

Flow Field ◽

Numerical Investigation

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Influence of wall roughness on cavitation performance of centrifugal pump

Journal of the Brazilian Society of Mechanical Sciences and Engineering ◽

10.1007/s40430-021-03023-3 ◽

2021 ◽

Vol 43 (6) ◽

Author(s):

Weihui Xu ◽

Xiaoke He ◽

Xiao Hou ◽

Zhihao Huang ◽

Weishu Wang

Keyword(s):

Flow Field ◽

Centrifugal Pump ◽

Internal Flow ◽

Wall Roughness ◽

Blade Surface ◽

Centrifugal Pumps ◽

Three Dimensional Model ◽

Cavitation Inception ◽

Cavitation Performance ◽

Critical Cavitation

AbstractCavitation is a phenomenon that occurs easily during rotation of fluid machinery and can decrease the performance of a pump, thereby resulting in damage to flow passage components. To study the influence of wall roughness on the cavitation performance of a centrifugal pump, a three-dimensional model of internal flow field of a centrifugal pump was constructed and a numerical simulation of cavitation in the flow field was conducted with ANSYS CFX software based on the Reynolds normalization group k-epsilon turbulence model and Zwart cavitation model. The cavitation can be further divided into four stages: cavitation inception, cavitation development, critical cavitation, and fracture cavitation. Influencing laws of wall roughness of the blade surface on the cavitation performance of a centrifugal pump were analyzed. Research results demonstrate that in the design process of centrifugal pumps, decreasing the wall roughness appropriately during the cavitation development and critical cavitation is important to effectively improve the cavitation performance of pumps. Moreover, a number of nucleation sites on the blade surface increase with the increase in wall roughness, thereby expanding the low-pressure area of the blade. Research conclusions can provide theoretical references to improve cavitation performance and optimize the structural design of the pump.

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