Model Of Centrifugal Pump Research Articles

Development of an extracorporeal pump for ECMO systems

Objective: today, extracorporeal membrane oxygenation (ECMO) systems remain the main type of short-term circulatory support in various clinical situations. One of the main elements of this system is a blood pump. The objective of this study is to develop the first domestic centrifugal pump for use in ECMO systems.Materials and methods. Based on a systematic literature review, the main medical and technical requirements for an extracorporeal centrifugal pump were formulated. To create 3D mathematical models of the outer casing of the pump and all its internal components, calculations were performed in CAD software package SolidWorks (SolidWorks Corp., USA). Hydrodynamic test benches were designed and developed to evaluate the performance of the centrifugal pump mockup. The pump was studied to obtain its head-capacity curve (HCC) and hemolytic characteristics.Results. 3D modeling of geometrical parameters of the pump flow impeller was performed. Fluid flow was assessed in the rotor rotation range at speeds from 3000 to 7000 rpm. Hydrodynamic bench tests were performed under conditions simulating the resistance of the oxygenator and connecting cannulas. The HCC was obtained based on the given medical and technical requirements for the operating flow range from 1 to 5 l/min at pressure dropsof 200 to 400 mm Hg.Conclusion. Based on results from the 3D modeling and bench experiments, a model of extracorporeal centrifugal pump was obtained, which showed its efficiency during the first trials. Further experimental studies will be conducted to obtain the energy and biological characteristics of the developed device.

Modelling of a cargo oil pump turbine system to find the optimum pump operation capacities through the design of experiments approaches

ABSTRACT This study aims to thoroughly understand and analyze the Cargo Oil Pump Turbine (COPT) system on tanker ships through thermodynamic and numerical simulations. The goal is to find the best pump capacities to match different cargo discharge rates and properties. A parametric study has been performed on the COPT system by building a thermodynamic model including exergy analysis, and a numerical centrifugal pump model. The design of experiment applications which are factorial design and response surface methodology (RSM) have determined the the optimal pump capacity The findings demonstrate that the risky flow rate region for the cavitation, if the density and vapour pressure are close to limits, is between 3050-3500 m3/h. The factorial design finds the best operating flow rate for the high capacity demands at 4025 m3/h where the efficiencies are the highest, and the RSM calculates the optimum capacity for the low demands at 1460.34 m3/h.

A set-covering approach to minimize the variety of standard chemical process pumps in equipment pools

A decision framework is presented to minimize the number of distinct ISO 2858 compliant standard chemical process pumps in an equipment pool. Two model variants are introduced: (i) the set cover problem to find the minimum number of ISO-sizes required to meet a given set of specifications, and (ii) the maximum coverage problem to investigate the trade-off between application coverage and equipment variety in the pump pool. A case study is carried out in cooperation with Evonik Operations GmbH applying the framework to a real-world data set; the results of which suggest significant potential to rationalize pumping equipment variety. Numerically, the decision model(s) were found tractable and thus readily applicable for industrial scale analyses. By including a model of centrifugal pump operating ranges taken from a dimensioning tool developed at German chemical industry association VCI, we eliminate the need to integrate further simulation software and minimize equipment-data requirements.

Fluid-induced vibration analysis of centrifugal pump including rotor system based on Computational Fluid Dynamics and Computational Structural Dynamics coupling approach

The flow-induced vibration of centrifugal pump under the effect of stator-rotor interaction are studied by Computational Fluid Dynamics method and Computational Structural Dynamics method based on the principle of one-way decomposition fluid-structure interaction. Firstly, the unsteady flow characteristics in centrifugal pump are studied by adopting the Computational Fluid Dynamics method, the numerical model of the whole flow field of the centrifugal pump is established, and the pulsating pressure characteristics of volute and impeller in the centrifugal pump are analyzed. The accuracy of the flow field modeling method and calculation method in this paper is verified by external characteristic test. Secondly, the vibration characteristic test of centrifugal pump is carried out, and the structural dynamic model and boundary conditions of centrifugal pump are verified and corrected in the modal test. Finally, the flow-induced excitation calculated by the flow field is simultaneously applied to the structural dynamics model of the centrifugal pump according to different transmission ways, and the flow-induced vibration of the whole centrifugal pump including the rotor system is calculated and analyzed by the Computational Structural Dynamics method in conjunction with rotor dynamics. Compared with the vibration test results, the validity of the flow-induced vibration calculation method of centrifugal pump in this paper is verified. The results show that under the influence of stator-rotor interaction effect, the blade passing frequency and shaft frequency are the main characteristic frequencies of pressure pulsation and dynamic response in the centrifugal pump.

Pressure resistance and dynamic response analysis of different magnetic blood pump base

This paper aims to explore the pressure resistance and vibration resistance performance of different magnetic blood pump base materials to help obtain the best material suitable for a centrifugal blood pump base. We establish a centrifugal blood pump model through CREO and combine it with ANSYS for simulation analysis, exploring the pressure resistance of PC, PVC, PP, PE, PA, POM, PBT, and ABS, and then the vibration resistance was investigated by dynamic response analysis. The results show that under the same conditions, pressure resistance is as follows: PVC > PE > POM > PC > ABS > PBT > PA > PP; vibration resistance is PE > PVC > ABS > PC > POM > PBT > PA > PP. PE with 2-mm thickness is the best choice of the base; at this time, the maximum deformation of the base is 0.133 mm, the maximum stress is 3.188 MPa, the first order frequency is 1311.6 Hz, and the maximum amplitude is 0.54 mm, which meets the requirements of the safety design.

Developing a digital twin of centrifugal pump for performance evaluation

Performance Evaluation of a physical asset can be made effortless with a headway to its virtual replica “A Digital Twin”. This article focuses on a thorough review of a digital twin of a centrifugal pump for performance evaluation. An exception to conventional performance evaluation method of a centrifugal pump can be made by its digital twin. This also proves beneficial for higher capacity pumps with appropriate scaling of the twin as the variant changes. A digital twin system may be useful to eliminate the setup and installation time, and the capital cost to develop product specific test bench. A twin which can be simulated and evaluated using MATLAB can be developed. The process that was used for creating a digital twin of centrifugal pump involves steps like selection of parameters to be measured, selection of microcontroller for data acquisition, IOT cloud interfacing using ThingSpeak, simulation of MATLAB model of centrifugal pump in ideal environment for flow rate measurement using Simscape. For obtaining the real-time data for flow rate of the centrifugal pump, a water flow sensor was attached to the pump and the sensor data was obtained and uploaded to ThingSpeak using ESP32 WiFi module. The ideal data for the flow rate of the centrifugal pump was obtained by creating a SimScape model of the centrifugal pump and flow sensor arrangement and simulating it in ideal environment. This will include, receiving sensor data to and during the operation of the pump and monitored on ThingSpeak IOT platform. The result of this entire process will be a statistical twin of a centrifugal pump for its performance evaluation based on the performance parameter- flow rate.

Numerical study on the performance of centrifugal blood pump with superhydrophobic surface.

In order to reduce the blood damage of an artificial heart pump and optimize its hydraulic performance, a centrifugal blood pump with superhydrophobic characteristics is proposed in this study. To study the influence of superhydrophobic surface characteristics on the performance of centrifugal blood pumps, the Navier slip model is used to simulate the slip characteristics of superhydrophobic surfaces, which is realized by the user defined function of ANSYS fluent. The user defined functions with different values of slip length are verified by two benchmark solutions of laminar flow and turbulence in the pipeline. The blood pump model adopts the designed centrifugal blood pump, and its head, hydraulic efficiency and hemolysis index are calculated. The Navier slip boundary condition (a constant slip-length of 50 μm) is applied to the walls of the blood pump impeller and a volute at different positions, and the influence of the superhydrophobic surface on the performance of the blood pump at the design point Q = 6 L/min was compared and analyzed. The results show that the centrifugal blood pump model used in this paper has good blood compatibility and meets the design requirements; the superhydrophobic surface can significantly reduce the scalar shear stress in the blood pump. At the design point, when the slip length is 50 μm, the mass-average scalar shear stress in the impeller area and the volute area reduction rate is about 5.9%, the hydraulic efficiency growth rate is about 3.8%, the hemolysis index reduction rate is about 18.4%, and the pressure head changes little with a growth rate of 0.3%. Centrifugal blood pumps with superhydrophobic surfaces can improve the efficiency of blood pumps and reduce hemolysis. Based on these encouraging results, vitro investigations for actual blood damage would be practicable.

Investigation on vibration of Centrifugal Pump by Bearing supported position

Vibration is one of the main problems which should be considered seriously in designing and operating a marine centrifugal pump to decrease vibration for the reliability of equipment and safety of ship. The reduction for vibration also can provide a guarantee for enhancing concealment, which will be benefit for military ships with higher requirements for concealment to improve combat effectiveness. A numerical calculation model of whole centrifugal pump was established in this paper. The emphasis of this article is that influence of bearing supported position on vibration of centrifugal pump. And conclusion was obtained that vibration peak can be reduced through adjust supported position of bearing reasonably. The simulation results was proved by experiment which was carried out in the Shaking Table Test.

Convolution Diagnosis Model of Centrifugal Pump Based on Fractal Dimension

Nowadays, more and more centrifugal pumps are used in the industrial domain. Normal operation of centrifugal pumps is also the key to maintain stable operation of production and process. So it is very important to monitor the operation status of centrifugal pumps real time on-line. In order to diagnose the fault of centrifugal pumps, we proposed a Convolutional Neural Network (CNN) fault diagnosis model, based on Fractal Dimension (FD) features. Firstly, we collected the vibration signal of centrifugal pumps and preprocessed them. Then we used the Empirical Mode Decomposition (EMD) to calculate the fractal dimension and the fractal matrix of the signal. Finally, we constructed the CNN model to diagnose and classify the fault of centrifugal pumps. The experiment shows that the accuracy of the proposed model can reach over 90%.

Influence of impeller clearance structure on volume loss of centrifugal pump

In this paper, the three-dimensional full flow field model of double volute structure centrifugal pump is established, and the ring seal, teeth seal and interlocking seal structures are set up. The K-e turbulence model of CFX software is used to simulate and analyse the fluid flow state at the gap of different mouth ring structures of centrifugal pump. The results show that the staggered ring structure can effectively reduce the leakage and improve the volumetric efficiency of centrifugal pump.

Numerical and Analytical Modeling of Centrifugal Pump

A mathematical model of non-stationary rotation modes of the rotor of a centrifugal pump is constructed. It is based on preliminary calculation in ANSYS Fluent package with subsequent analytical calculation taking into account the specified parameters

Linear and Nonlinear Controllers of a Solar Photovoltaic Water Pumping System

This paper provided a comparative study between linear and nonlinear controllers of a solar photovoltaic (PV) water pumping system using an induction motor and a centrifugal pump. For linear controller, classical Perturb and Observe was selected to ensure the operation of the PV system at the maximum power point (MPP) and is combined with Indirect Rotor Field Oriented Control (IRFOC) based on a conventional proportional integral speed regulator chosen to control and to optimize the rotor speed. In second and third controllers, Backstepping and first order sliding mode controls were proposed for controlling the whole system. To regulate and optimize rotor speed in the nonlinear controller, all considered control techniques were combined with IRFOC in order to establish easy control laws. In addition, MPP was tracked by acting on the DC-DC converter and using its mathematical model for developing control laws. Maximum delivered power was used as reference signal for optimizing actual rotor speed. The controlled system is operated without mechanical sensors. Estimators of rotor speed and load torque disturbances were proposed based on the mathematical model of induction motor and centrifugal pump and using only available output measurements. Induction motor was supplied by a voltage source inverter controlled using a PWM technique. Stability based on Lyapunov functions of the closed-loop system was evaluated. Simulation results were investigated and reveal some very interesting features and the effectiveness of the nonlinear proposed strategies.

Computational Analysis on Numerical Simulation of Internal Flow Physics for Pump as Turbine in Renewable Small Hydro Energy Generation

Energy contributes significantly in almost all aspects of human life as well as economic activities and plays a crucial role in the infrastructural development of a county to alleviate poverty. Generating energy from a renewable source such as small hydropower through the application of pump operating as a turbine mode called Pump as Turbine is one of the best alternatives to provide clean and inexpensive energy. Using Pump as Turbine helps in generating reasonably priced hydroelectric power for communities in underdeveloped counties. This study investigates the effects of internal flow behaviour and performance of Pump as Turbine under different rotational speed and flow rate. The rotational speed is an essential physical parameter as it affects the Pump as Turbine operation. A model-specific speed centrifugal pump model with head 32 (m), flow rate of 12.5 (m3/h) and the rotational speed of 2900 rpm, has been selected for the study. Numerical simulations have been conducted using the k-ω turbulence model to solve three-dimensional (3D) equations. The pump mode experimental data were used to confirm the results for better analysis. The results predicted that vortex and turbulent kinetic energy increase per rotational speed increase. Also, at the higher rotational speed, very high recirculation of flow is detected at the blade suction chamber, although the pressure side has a smooth flow. This study provides beneficial information which will serve as a reference to help improve PAT performance along with selecting PAT for a small hydropower site. Future works will consider the impact of blade thickness and cavitation in Pump as Turbine.

Investigating the state of renewable energy and concept of pump as turbine for energy generation development

Access to consistent and clean energy is a key challenge faced by several countries globally; especially in Asian and African countries. Most of the communities within these and other regions in the world are faced with continuous energy crisis, causing most of these economies to cripple. It is estimated that billions of people worldwide are living without access to clean and reliable source of energy. Renewable energy is the biggest source of energy and it characterizes the basis to steer the energy system in the direction of sustainability and supply security. Several countries globally are blessed with rich renewable energy resources that have not been fully developed. These renewable resources have the potentials to change the status quo of power generation and consumption in these countries. In this study, the status of renewable energy generation and storage was identified and discussed. A specific centrifugal pump model with radial volute and 6 impeller blades having inlet and outlet diameter of 104 mm and 160 mm respectively. The operational parameter of the head is 16 m, flow rate is 12.5 m3/h, rotational speed is 2900 r/min and efficiency is 56% were selected to carry out numerical simulations in the study. Using the centrifugal pump to operate as turbine (PAT), is one of the best alternatives for small and micro hydro generation since it helps in meeting energy needs. Furthermore, it can also help improve economic growth due to its cheapest source of power generation as well as providing sustainable energy source that will create more employment opportunities to improve the socio-economic environments of the people. Moreover, PAT method are also advantageous because of its low cost in acquisition and maintenance. The characteristics of PAT have been discussed numerically to analyze pressure and velocity distribution at different rotational speeds. The study concludes that PAT is the best alternative for energy generation.

Linear and nonlinear controllers of a solar photovoltaic water pumping system

This paper provided a comparative study between linear and nonlinear controllers of a solar photovoltaic (PV) water pumping system using an induction motor and a centrifugal pump. For linear controller, classical Perturb and Observe was selected to ensure the operation of the PV system at the maximum power point (MPP) and is combined with Indirect Rotor Field Oriented Control (IRFOC) based on a conventional proportional integral speed regulator chosen to control and to optimize the rotor speed. In second and third controllers, Backstepping and first order sliding mode controls were proposed for controlling the whole system. To regulate and optimize rotor speed in the nonlinear controller, all considered control techniques were combined with IRFOC in order to establish easy control laws. In addition, MPP was tracked by acting on the DC-DC converter and using its mathematical model for developing control laws. Maximum delivered power was used as reference signal for optimizing actual rotor speed. The controlled system is operated without mechanical sensors. Estimators of rotor speed and load torque were proposed based on the mathematical model of induction motor and centrifugal pump and using only available output measurements.. Simulation results were investigated and the effectiveness of the nonlinear proposed strategies.

PERHITUNGAN NILAI OVERALL EQUIPMENT EFFECTIVENESS PADA POMPA DISTRIBUSI KUBOTA DOUBLE SUCTION VOLUTE PUMP MODEL DV-L DI PT. ABC

Evaluation of machine performance is certainly very necessary to improve company production performance, one of which can be done by knowing the value of performance effectiveness using the Overall Equipment Effectiveness (OEE) calculation. This research was conducted on the Kubota Double Suction Volute Pump Model DV-L centrifugal pump at PT. ABC. The purpose of this study is to determine the Overall Equipment Effectiveness (OEE) value based on availability, performance and rate of quality factors. To compare the company OEE values obtained with the Overall Equipment Effectiveness World Class standard and proceed with identifying six big losses and knowing the root causes of OEE values using a causal diagram. Calculations obtained an Availability value of 99,07%, Performance of 91,53% and Quality of 100% and an average OEE of 90,68%. It is known that the OEE value is at the OEE standard >85%, but the performance value of the pump is still below the JIPM performance standard of >95% so that corrective action can be taken to increase the performance value of the effectiveness of the clean water distribution process using the Kubota Double Secton Volute centrifugal pump Pump Model DV-L.

Tesla Bladed Pump (Disc Bladed Pump) Preliminary Experimental Performance Analysis

A preliminary experimental work on a centrifugal pump model specifically designed to transport slurry and multiphase flows is presented. The impeller design corresponds to the so-called “Tesla Bladed Pump” adapted from an existing DiscflowTM pump design for the petroleum deep-sea application. The overall performance results of such a specific pump design are presented for different rotational speeds and discussed in relation to affinity laws coefficients. The results show that the performance of the tested disc pump strongly differs from the conventional centrifugal bladed pump. A one-dimensional approach using complete Euler relation is used to explain the differences in the present case. Moreover, it has been found that available results in open literatures do not correspond to the real optimum conditions, more detailed research work must be performed to get a better understanding on this kind of bladed disc pump.

Diagnosis and Resolution of Vibration Issues in Vertical Centrifugal Pump

Centrifugal pumps are more popular for industrial and domestic applications because of small in size, less in capital cost, easy to maintain, able to work at medium to low heads and low viscous fluids when compared to other pumps. Present problem is to diagnosis and resolution of vibration issues of the vertical centrifugal pump at Visakhapatnam steel plant by using experimental and numerical vibration analysis methods. The power, speed, discharge and pressure head of vertical centrifugal pump used in present analysis are 75 kW, 3572 rpm, 150 m3/h and 190 m, respectively. Experimental vibration analysis and modal analysis are carried with the help of fast Fourier transformation analyser, impact hammer and acceleration sensor. The dimensions of various parts of domestic vertical centrifugal pump are obtained using reverse engineering method. Vertical centrifugal pump parts like motor, pump shaft, motor shaft, coupling, coupling cover, pump, tie rods and base frame are modelled and assembled using CATIA. The solid model of vertical centrifugal pump is exported into ANSYS to carry out numerical modal and harmonic analysis to find natural frequencies and vibration levels, respectively. Numerical modal and harmonic analysis results of existing vertical centrifugal pump are compared with experimental results and found that there is good agreement between the results (the maximum error is 5.6%). From the experimental vibration analysis, peak vibration velocity of 12.3 mm/s is observed at coupling cover. From the experimental natural frequency test, the natural frequency of coupling cover of vertical centrifugal pump is observed at 59.3 Hz and it is close to operating speed. So, problem in vertical centrifugal pump is identified at coupling cover. Structural modifications are carried out on coupling cover of vertical centrifugal pump to increase the natural frequencies to reduce the vibration levels. Numerical modal and harmonic analysis are carried out on modified pump to find the natural frequency and vibration levels to quantify the reduction in vibration levels. From this analysis, it is observed that natural frequency is increased to 137.5 Hz and vibration levels are reduced to 0.7 mm/s.

Volumetric Flow Observer For A Pumping Unit Without Backpressure With Induction Electric Drive

The article describes the construction of a volumetric fluid supply observer in pumping systems. The electric drive of the pump unit uses an induction motor with a squirrel-cage rotor. The rotation speed of the electric motor is adjustable. A centrifugal pump is used to pressurize a pipeline. Requirements for the automation level of pumping units are growing, so the research topic is relevant. When constructing the observer, the double squirrel cage induction motor model in a fixed coordinate system is used. The impeller rotation speed and the pump resistance moment were estimated based on the Luenberger observer. The observer is used to identify the volume flow. It is based on a centrifugal pump model using approximating coefficients of a Second-Degree Polynomial function. The article provides the dynamic characteristics of the reference model and observer. As a studies result, an error in the steady state operating mode of 1% was determined.

Comparative Study on Turbulence Models of High-Speed Centrifugal Pump with Low Specific Speed

It is very important to use high-speed centrifugal pump with low specific instead of multi-stage high-pressure pump to reduce the volume of the whole marine reverse osmosis seawater desalination system. Based on the design model of high-speed centrifugal pump with low specific speed, we did a comparative study of 11 kinds of turbulence models with numerical simulation. Five methods (the convergent curves, calculation time step, characteristics curves, impeller fluid velocity and pressures, volute section surface streamline) are included to find the most suitable turbulence model. The results show that k-ε is the most suitable turbulence model to compare with design conditions and external characteristics, SST and RNG k-ε turbulence models appears more surface streamline details in the volute section.