Investigation of the Matching Relation Between Impeller and Flow Channel of Regenerative Flow Pumps

2021 ◽  
Author(s):  
Qianqian Li ◽  
Chengshuo Wu ◽  
Bo Qian ◽  
Peng Wu ◽  
Bin Huang ◽  
...  
Keyword(s):  
Performance Optimization ◽  
Cfd Simulation ◽  
Flow Channel ◽  
Longitudinal Vortex ◽  
Exchange Flow ◽  
Low Velocity ◽  
Matching Mechanism ◽  
Regenerative Flow ◽  
Flow Pump ◽  
Matching Relation

Abstract As a specific radial flow pump, the regenerative flow pump (RFP) usually has a low efficiency. In this study, in order to explore the matching mechanism, three cases with various matching relations were investigated by the methods of theoretical calculation, computational fluids dynamics (CFD) simulation, and experiment test. The results illustrate that the theoretical prediction, numerical simulation and experimental data are in good agreement. Furthermore, when the matching relation expressed by a ratio of the channel's and blade's radial length is equal to 1, the geometrical profiles of RFP can well guide the circulation flow into the channel at large radii and into the impeller at small radii, forming intense longitudinal vortex. The steady, strong exchange flow is characterized by the inflow and outflow regions approximately half of the iso-surface. The axial vortex motion without apparent flow separation and irregular flow is observed in the impeller, a low velocity annulus exists in the medium radii of the impeller without other distinct velocity clouds, and a low velocity strip and a high velocity annulus in the channel are respectively performed along the blade's pressure surface and the channel's outer radii. All of this corresponds to the best pump's performance and the largest efficiency of the impeller and channel. This work promotes a systematical understanding of the matching mechanism between impeller and flow channel in the RFP and could provide some reference for the design and performance optimization for RFP.

Investigation on the Energy Exchange Characteristics of the Regenerative Flow Pump in an Automobile Fuel System

2020 ◽  
Vol 142 (11) ◽  
Author(s):  
Qian-qian Li ◽  
Guo-shou Zhao ◽  
Cheng-shuo Wu ◽  
Peng Wu ◽  
Da-zhuan Wu ◽  
...  
Keyword(s):  
Energy Exchange ◽  
Cfd Simulation ◽  
Longitudinal Vortex ◽  
Axial Distance ◽  
Exchange Flow ◽  
Circulation Flow ◽  
Computational Fluids Dynamics ◽  
And Performance ◽  
Regenerative Flow ◽  
Flow Pump

Abstract The flow inside the regenerative flow pump (RFP) is quite complex. This study investigated four pump models with various geometrical dimensions to explore the energy exchange characteristics. A computational fluids dynamics (CFD) simulation and the experiment were carried out. The results illustrate that the pressure growth mode in the impeller is consistent with the channels, which confirms the circulation flow existing in the pump. Furthermore, it is found that the circulation flow that features with longitudinal vortexes can be evaluated quantitatively by combining the analyses of the dimensionless axial distance, circulation number and entropy production. A smaller axial distance indicates that more flow is involved in the circulation and the intensity of the longitudinal vortex is enhanced; a large circulation number accompanied by a small dissipation loss could result in a satisfactory exchange flow. Therefore, the largest circulation number, least amount of dissipation, and shortest distance lead to the highest head and efficiency in the model with V-shaped blades and an increased impeller height. This work establishes a deeper understanding of the energy exchange mechanism and could serve as a reference for the geometrical design and performance reinforcement of RFP.

Performance Analysis of the PISO-Based CFD Simulation

2014 ◽  
Vol 607 ◽  
pp. 872-876 ◽  
Author(s):  
Xiao Guang Ren
Keyword(s):  
Performance Optimization ◽  
Execution Time ◽  
Cfd Simulation ◽  
Fluid Flows ◽  
Total Execution Time ◽  
Simulation Performance ◽  
Simulation Efficiency ◽  
Matrix Operations ◽  
The Matrix ◽  
Computational Fluid Dynamics Cfd

Computational Fluid Dynamics (CFD) is widely applied for the simulation of fluid flows, and the performance of the simulation process is critical for the simulation efficiency. In this paper, we analyze the performance of CFD simulation application with profiling technology, which gets the portions of the main parts’ execution time. Through the experiment, we find that the PISO algorithm has a significant impact on the CFD simulation performance, which account for more than 90% of the total execution time. The matrix operations are also account for more than 60% of the total execution time, which provides opportunity for performance optimization.

The minimal flow unit in near-wall turbulence

1991 ◽  
Vol 225 ◽  
pp. 213-240 ◽  
Author(s):  
Javier Jiménez ◽  
Parviz Moin
Keyword(s):  
Wall Stress ◽  
Wall Layer ◽  
Flow Unit ◽  
Wall Turbulence ◽  
Longitudinal Vortex ◽  
Spanwise Direction ◽  
Wall Region ◽  
Low Velocity ◽  
Good Agreement ◽  
Near Wall

Direct numerical simulations of unsteady channel flow were performed at low to moderate Reynolds numbers on computational boxes chosen small enough so that the flow consists of a doubly periodic (in x and z) array of identical structures. The goal is to isolate the basic flow unit, to study its morphology and dynamics, and to evaluate its contribution to turbulence in fully developed channels. For boxes wider than approximately 100 wall units in the spanwise direction, the flow is turbulent and the low-order turbulence statistics are in good agreement with experiments in the near-wall region. For a narrow range of widths below that threshold, the flow near only one wall remains turbulent, but its statistics are still in fairly good agreement with experimental data when scaled with the local wall stress. For narrower boxes only laminar solutions are found. In all cases, the elementary box contains a single low-velocity streak, consisting of a longitudinal strip on which a thin layer of spanwise vorticity is lifted away from the wall. A fundamental period of intermittency for the regeneration of turbulence is identified, and that process is observed to consist of the wrapping of the wall-layer vorticity around a single inclined longitudinal vortex.

scholarly journals Performance Optimization of Ejector using Computation Fluid Dynamics

2020 ◽  
Vol 8 (5) ◽  
pp. 2905-2910
Keyword(s):  
Fluid Dynamics ◽  
Performance Optimization ◽  
Cfd Simulation ◽  
Experimental Testing ◽  
High Reliability ◽  
Fluid Velocity ◽  
Pressure Ratio ◽  
Operating Cost ◽  
Flow Characteristics ◽  
Operating Conditions

Ejector is a device used for carry low pressure fluids with no mechanical force, high pressure flow. This contains the main nozzle, chamber for suction, chamber for mixing and diffu ser.It is used in vaccum pumps, condensers, steam refrigeration, Because of its simple structure, gas mixing, pneumatic transport (no moving parts) and reliable operation. It is also used in pumps for lifting slurries and waste material containing solids from tanks and sumps. Due to their simplicity and high reliability, however, jet ejectors are widely used in industries with low efficie ncy. The project's goal is to optimize the efficiency of jet ejectors for each operating condition.Consequently, the primary fluid consumption and operating cost is minimized. A commercial computational fluid dynamics tool would be used to analyse the flow characteristics inside the ejector geometry. The results of the CFD simulation could be used to understand the effect of fluid velocity and pressure ratio on the ejector performance. The analysis would also be carried out by varying the primary and secondary nozzle dimensions. Performance of ejectors under various operating conditions is generally obtained through an experimental testing of prototype or scaled ejectors. The availability of performance parameters for such ejectors is limited, and experimental testing can be cost prohibitive.

scholarly journals Multi Effect Evaporator Design Calculation for Brown Sugar Production using Computational Fluid Dynamics

2020 ◽  
Vol 9 (3S) ◽  
pp. 87-90
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Velocity ◽  
Performance Optimization ◽  
Cfd Simulation ◽  
Design Parameters ◽  
Design Calculation ◽  
Sugar Production ◽  
Brown Sugar ◽  
Process Stage

The industrial brown sugar production process is commonly started from grinding, filtering, first heating, sulfuric acid addition, decantation, and evaporation. Evaporation process is essential process stage in the production of brown sugar. The use of Multiple Effects Evaporator (MEE) has been becoming more common and plays an important role in the food industry, especially for producing high quality agricultural products. Therefore, several design parameters of MEE should be carefully considered such as pressure, temperature, and flow velocity. This study discusses the semi-iterative design of triple effect of feed forward system MEE for industrial-scale and simulation using Computational Fluid Dynamics (CFD). This study successfully determine the optimum value for the MEE parameters in the manufacture of brown sugar and also compared with Ms.Excel-Solver simulation. The CFD simulation indicates an accurate design process that can be employed to determine the effect of pressure, temperature, and flow velocity for MEE performance optimization.

A modified theory for the flow mechanism in a regenerative flow pump

2003 ◽  
Vol 217 (3) ◽  
pp. 311-321 ◽  
Author(s):  
J. W. Song ◽  
A Engeda ◽  
M. K. Chung
Keyword(s):  
Flow Region ◽  
Hydrogen Gas ◽  
Space Vehicles ◽  
Fully Developed Flow ◽  
Vortex Compressor ◽  
Agricultural Industries ◽  
Flow Compressor ◽  
Regenerative Flow ◽  
Modified Theory ◽  
Flow Pump

The regenerative flow pump (RFP) and regenerative flow compressor (RFC) are turbomachines capable of developing high pressure ratios in a single stage. They are also known by other names, such as peripheral, side channel, turbine, traction and vortex compressor/pump. Even though the efficiency of RFP/RFC is usually less than 50 per cent based on past design experience, they have found wide applications in automotive and aerospace fuel pumping, booster systems, water supply, agricultural industries, shipping and mining, chemical and food stuffs industries, and regulation of lubrication and filtering. RFCs have been proposed for use in hydrogen gas pipelines and as helium compressors for cryogenic applications in space vehicles. RFTs are used as accessory drives on aircraft and missiles. With the aim of improving the performance and efficiency of an RFP, this paper proposes an improved and modified theoretical model that can explain the change in the circulatory velocity caused by variation in channel area. All previous works concentrated on the fully developed flow region in the RFP and this work expands consideration to the developing region. Furthermore, in order to make the above-suggested model a closed problem, several loss models were assumed and the results of predictions were compared with experimental and CFD data.

Low-Velocity Heat Transfer to a Flat Plate in The Presence of a Corona Discharge in Air

1979 ◽  
Vol 101 (1) ◽  
pp. 157-163 ◽  
Author(s):  
H. R. Velkoff ◽  
R. Godfrey
Keyword(s):  
Heat Transfer ◽  
Flat Plate ◽  
Corona Discharge ◽  
Convection Heat Transfer ◽  
Flow Channel ◽  
Zehnder Interferometer ◽  
Plate Surface ◽  
Convection Heat ◽  
Low Velocity ◽  
Surface Data

A study was conducted to determine the enhancement in convection heat transfer that could be achieved using the corona wind over a range of stream velocities. A heated flat plate mounted in a flow channel was placed in a Mach-Zehnder interferometer. Corona wires were placed above the active plate surface. Data were taken over a range of stream velocities. The results showed the expected large increase in heat transfer at low velocities and that this gain in heat transfer decreased to zero at high stream velocities.

scholarly journals CFD simulation of an internal spin-filter: evidence of lateral migration and exchange flow through the mesh

2009 ◽  
Vol 61 (1-2) ◽  
pp. 55-64 ◽  
Author(s):  
Alvio Figueredo-Cardero ◽  
Ernesto Chico ◽  
Leda R. Castilho ◽  
Ricardo A. Medronho
Keyword(s):  
Cfd Simulation ◽  
Exchange Flow ◽  
Lateral Migration ◽  
Spin Filter ◽  
Flow Through

Flow Analysis and Design Suggestions for Regenerative Flow Pumps (Keynote)

2003 ◽  
Author(s):  
Abraham Engeda
Keyword(s):  
Flow Analysis ◽  
Flow Region ◽  
Design Guideline ◽  
Fully Developed Flow ◽  
Analysis And Design ◽  
Vortex Pump ◽  
Developing Region ◽  
The Status ◽  
Regenerative Flow ◽  
Flow Pump

The Regenerative Flow Pump, here referred to as RFP is a turbomachine capable of developing high pressure ratios in a single stage. It is also known with other names such as: • Peripheral pump; • Side channel pump; • Turbine pump; • Drag pump; • Traction pump; • Vortex pump. This paper reviews the status of the RFP and proposes a design guideline, with the aim to improve the performance and efficiency of the RFP. All previous works concentrated on the fully-developed flow region in the RFP and this work expands the consideration to the developing region.

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