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.

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.

scholarly journals Flow Pattern Analysis and Performance Improvement of Regenerative Flow Pump Using Blade Geometry Modification

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
J. Nejadrajabali ◽  
A. Riasi ◽  
S. A. Nourbakhsh
Keyword(s):  
Numerical Study ◽  
Design Flow ◽  
Flow Coefficient ◽  
Low Flow ◽  
Maximum Efficiency ◽  
Low Specific Speed ◽  
And Performance ◽  
Regenerative Flow ◽  
Inlet Angle ◽  
Flow Pump

Regenerative pump is a low specific speed and rotor-dynamic turbomachine capable of developing high heads at low flow rates. In this paper, a numerical study has been carried out in order to investigate the effect of blade angle on the performance of a regenerative pump. Two groups of impellers were employed. The first type has symmetric angle blades with identical inlet/outlet angles of ±10°, ±30°, and ±50° and the second group has nonsymmetric angle blades in which the inlet angle was set to 0° and six different angles of ±10°, ±30°, and ±50° were designed for the outlet of the blades. A total of 12 impellers, as well as primary radial blades impeller, were investigated in this study. The results showed that all forward blades have higher head coefficients than radial blades impeller at design flow coefficient. It was found that regenerative pumps with symmetric angle forward blades have better performance than other types. Also, it is worth mentioning that the highest head coefficient and efficiency occur at angle+10<β<+30of symmetric angle blades. It was found that the maximum efficiency occurs at angle of +15.5° by curve fitting to the data obtained from numerical simulations for symmetric angle forward blades.

Current Status, Design and Performance Trends for the Regenerative Flow Compressors and Pumps

2002 ◽  
Author(s):  
Mukarrum Raheel ◽  
Abraham Engeda
Keyword(s):  
Performance Improvement ◽  
Current Status ◽  
Ongoing Research ◽  
Performance Trends ◽  
The Family ◽  
Working Principle ◽  
Low Specific Speed ◽  
And Performance ◽  
Number Of Publications ◽  
Regenerative Flow

Regenerative flow compressors and pumps, hereafter called RFC/RFP have found many applications in industry; still they are the most neglected turbomachines in the family of dynamic compressors. The number of publications existing in literature is very small compared to the large number of papers about the centrifugal and axial turbocompressors. This paper gives a detail discussion of fundamentals and working principle of regenerative turbomachines. Regenerative compressors are compared with centrifugal compressors and the importance of regenerative turbomachines in low specific speed range is emphasized. The major findings of available literature on regenerative turbomachine are summarized. The current status, limitations and some of the challenges faced by RFC/RFP are assessed in context of performance improvement. The paper concludes with an overview of ongoing research and future directions to be followed for performance improvement of this neglected class of turbomachines.

scholarly journals Parametric Study on a Performance of a Small Counter-Rotating Wind Turbine

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3880
Author(s):  
Michał Pacholczyk ◽  
Dariusz Karkosiński
Keyword(s):  
Wind Turbine ◽  
Parametric Study ◽  
Rotor Blades ◽  
Speed Ratio ◽  
Outer Diameter ◽  
Axial Distance ◽  
Computational Domain ◽  
Dynamic Interactions ◽  
Computational Fluids Dynamics ◽  
Large Eddy

A small Counter-Rotating Wind Turbine (CRWT) has been proposed and its performance has been investigated numerically. Results of a parametric study have been presented in this paper. As parameters, the axial distance between rotors and a tip speed ratio of each rotor have been selected. Performance parameters have been compared with reference to a Single Rotor Wind Turbine (SRWT). Simulations were carried out with Computational Fluids Dynamics (CFD) solver and a Large Eddy Scale approach to model turbulences. An Actuator Line Model has been chosen to represent rotors in the computational domain. Summing up the results of simulation tests, it can be stated that when constructing a CRWT turbine, rotors should be placed at a distance of at least 0.5 D (where D is rotor outer diameter) or more. One can then expect a noticeable power increase compared to a single rotor turbine. Placing the second rotor closer than 0.5 D guarantees a significant increase in power, but in such configurations, dynamic interactions between the rotors are visible, resulting in fluctuations in torque and power. Dynamic interactions between rotor blades above 0.5 D are invisible.

scholarly journals CFD Simulation Study on the Performance of a Modified Ram Air Turbine (RAT) for Power Generation in Aircrafts

Fluids ◽  
2021 ◽  
Vol 6 (11) ◽  
pp. 391
Author(s):  
Magedi Moh M. Saad ◽  
Sofian Mohd ◽  
Mohd Fadhli Zulkafli ◽  
Nor Afzanizam Samiran ◽  
Djamal Hissein Didane
Keyword(s):  
Fossil Fuels ◽  
Cfd Simulation ◽  
Turbulence Modeling ◽  
3D Models ◽  
Navier Stokes ◽  
Axial Distance ◽  
Navier Stokes Equation ◽  
Auxiliary Power Unit ◽  
Auxiliary Power ◽  
Air Turbine

The present paper aims to study the possibility of dispensing an auxiliary power unit (APU) in an aircraft powered by fossil fuels to reduce air pollution. It particularly seeks to evaluate the amount of power generated by the ram air turbine (RAT) using the novel counter-rotating technique while characterizing its optimum axial distance. The ram air turbine (RAT), which is already equipped in aircrafts, was enhanced to generate the amount of energy produced by the APU. The approach was implemented by a CRRAT system. Six airfoil profiles were tested based on 2D models and the best airfoil was chosen for implantation on the RAT and CRRAT systems. The performance of the conventional single-rotor RAT and CRRAT were analyzed using FLUENT software based on 3D models. The adopted numerical scheme was the Navier–Stokes equation with k–ω SST turbulence modeling. The dynamic mesh and user-defined function (UDF) were used to revolve the rotor turbine via wind. The results indicated that the FX63-137 airfoil profile showed a higher performance in terms of the lift-to-drag ratio compared to the other airfoils. The optimum axial distance between the two rotors was 0.087 m of the rotor diameter and the efficiency of the new CRRAT increased to almost 45% compared to the single-rotor RAT.

scholarly journals CFD simulation on centrifugal pump impeller with splitter blades

2020 ◽  
Vol 24 (1) ◽  
pp. 3-7 ◽  
Author(s):  
Henrique M. P. Rosa ◽  
Bruno S. Emerick
Keyword(s):  
Centrifugal Pump ◽  
Cfd Simulation ◽  
Computational Simulations ◽  
Pump Impeller ◽  
Impeller Blade ◽  
Flow Rates ◽  
Computational Fluids Dynamics ◽  
Ansys Cfx ◽  
Computational Fluids ◽  
Centrifugal Pump Impeller

ABSTRACT The present paper aims to present the analysis and comparison of results of computational simulations using Computational Fluids Dynamics (CFD) in impellers of centrifugal pump. Three impellers were simulated: 1) original impeller, 2) original impeller with splitter blades at outlet; 3) original impeller with splitter blades at inlet. The splitters occupied 30% of the length of the main blades. They were simulated using the ANSYS-CFX software system in 1500 rpm rotational speed and at different flow rates. The turbulence model assumed was the Shear Stress Transport (SST). The results were used to build impeller blade head curves, besides the presentation of pressure distribution and streamline behaviour inside the impeller. It was verified that the insertion of the splitter blades reduced the impeller blade head, mainly the impeller with outlet splitter, whose reduction was more intense.

Redesign and Performance Analysis of Medium Flow Coefficient Centrifugal Compressor

2019 ◽  
Author(s):  
Khaled Yousef ◽  
Abraham Engeda ◽  
Ahmed Hegazy
Keyword(s):  
Experimental Data ◽  
Centrifugal Compressor ◽  
Program Analysis ◽  
Cfd Simulation ◽  
Analysis Data ◽  
Performance Comparison ◽  
Flow Coefficient ◽  
And Performance ◽  
Performance Discrepancy ◽  
House Design

Abstract In-house design/analysis program is used in this study to redesign and predict the entire performance of an existing centrifugal compressor. The centrifugal compressor experimental data from a cooperative company is validated first with the 3D CFD simulation for a single passage flow. The validation shows an acceptable performance discrepancy between experimental data and CFD for the existing impeller. Then, a redesign procedure by the in-house program is carried out to get more efficient impeller based on the experimental data. This redesigned impeller is re-implemented in the CFD simulation to be compared with in-house program analysis data. The validation shows a good performance comparison between CFD and in-house program for the redesigned impeller. Moreover, this procedure succeeds to improve the redesigned stage efficiency and work coefficient with 6.79%, and 10.55% compared to the experimental impeller, respectively.

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