Teses / dissertações: "Centrifugal pump"

1

Rose, Martin George. "Flow in centrifugal water pump impellers". Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253798.

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2

Foslie, Sverre Stefanussen. "Design of Centrifugal Pump for Produced Water". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24348.

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During the spring of 2008, Jón Bergmann Heimisson developed a pump design program in Matlab. The program has been further developed during the work with this thesis, as well as in the author's preceding project thesis, giving key information for an existing pump design. The aim of this Master's thesis has been to verify the calculation of pump characteristics and velocity profiles at the impeller outlet through testing.A detailed description of the relevant theory regarding pump design has been presented, and different calculation models for the pump characteristics have been examined. The analytical approaches for calculating the performance data have been implemented into Matlab, and a comparison of the different calculation models has been performed. A multistage centrifugal pump has been used for verifying the velocity profiles, and the pump characteristics have been compared to the different calculation models presented in Matlab. Measurements of the velocity profiles were carried out in Typhonix' laboratories at Varhaug using a pitot-static probe.The results achieved from the comparison of the characteristic curves calculated in Matlab showed that the models provide quite different results. Some of the methods widely used in the literature proved to deviate significantly from the measured results, while other and more advanced methods provided better results.The results achieved from testing the velocity profiles with the pitot-static probe were not as good as desired. The measured velocities and flow angles did not correlate well with the analytical solutions, and the results are partly unreliable. Some of the trends regarding changes due to increased volume flow or rotational speed were found, but the exact values could not be trusted. The pitot-static probe is an intrusive method, and it probably disturbed the flow in a way making good results difficult to achieve.

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3

Yano, Keiji. "Numerical simulation for a centrifugal heart pump /". The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487947908400957.

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4

Bardeleben, Michael John Ross Weaver David S. "Acoustic characterization of a centrifugal pump using a two-port model /". *McMaster only, 2005.

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5

Ding, Wei. "Computational fluid analysis of a centrifugal heart pump /". The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487949836206911.

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6

Adkins, Douglas Ray Brennen Christopher E. Brennen Christopher E. "Analyses of hydrodynamic forces on centrifugal pump impellers /". Diss., Pasadena, Calif. : California Institute of Technology, 1986. http://resolver.caltech.edu/CaltechETD:etd-03262007-111453.

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7

Berchane, Nader Samir. "Experimental evaluation of the flow field inside an open faced impeller". Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/1610.

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The pressure distributions and forces presented in a thesis by Hossain [1] for a centrifugal pump illustrated a somewhat complex inter-relationship between various geometric and operating parameters of the pump studied. The pump had an open faced impeller of 33.65 cm diameter with 5 blades of backswept design. It was felt that the best way to resolve some of the questions related to Hossains results was to determine the fluid velocity field inside the pump. Thus the flow field through the impeller passages was measured using a 1-D Laser Doppler Velocimetry (LDV) system. The LDV was used to measure the radial and tangential velocity components as well as the turbulence intensities over the region accessible through the two optical windows in the front of the pump housing. Five axial planes were investigated by recording measurements along two radial lines at azimuthal angles of 45° and 315° (with respect to the horizontal axis of the pump) for design operating conditions. A once per revolution signal was used to supply the LDV system with a reference for the rotor position. It was found out that a leakage flow existed near the front wall of the impeller at z/h = 0.11, which was generated by the pressure difference between the impeller exit and inlet. It was also concluded that the velocity field was not fully two-dimensional in nature. This was believed to be a result of the 90° turn that the fluid endures as it enters the impeller inlet from the suction pipe.

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8

Karamanoğlu, Yılmaz Mobedi Moghtada. "Investigation of flow through a semi axial centrifugal pump/". [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/fizik/T000536.pdf.

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Thesis (Master)--İzmir Institute of Technology, İzmir, 2006.
Keywords:Computational fluids dynamic, pump characteristics, turbomachinery, pumps, centrifugal pumps. Includes bibliographical references (leaves 88-89).

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9

Downham, S. E. "Modelling the two-phase performance of a centrifugal pump". Thesis, Cranfield University, 2000. http://dspace.lib.cranfield.ac.uk/handle/1826/11005.

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A review was carried out which revealed that no simple mathematical model was available which could be used to predict the performance of a centrifugal pump when it is operating under two phase flow conditions. Experimental analyses were carried out to aid the development of such a model. A rotating channel test rig was designed to study the structure of airwater flow through an impeller passageway. The observations generated a large amount of qualitative data. A full scale centrifugal pump was also tested which provided data that allowed the results of the rotating channel experiments to be considered in more quantitative terms. These two sets of experimental work allowed a conceptual model of the two phase flow through a centrifugal pump to be constructed. The model assumes that forces act on the bubbles as they pass through the impeller passageway because of the rotation and the curvature of the impeller passageway. These forces cause the bubbles to decelerate and coalesce creating a stationary air void which leads to a partial blockage of the channel. This causes the velocity of the fluid passing through the pump to be modified. The model uses a onedimensional velocity vector approach adjusted for hydraulic losses to calculate the head raised by the pump under such conditions. The model presented provides the basis upon which a predictive tool could be developed and used in the development engineering environment. Currently operational problems that arise because of two phase flow are often quantified using scaled hydraulic models, which are expensive, or within the actual application where costly engineering solutions may be required to give acceptable performance. A mathematical model is a much more cost effective tool and its application allows the engineer to decide whether system performance would be compromised by the two phase conditions encountered and propose possible solutions. In recommending the development of such a model it is necessary to consider where and how in the project cycle it should be used. A number of companies were canvassed and it was concluded that in many cases such models are used too late in the project cycle to provide maximum return. In the case of projects which include participants from a number of companies it is suggested that an inter-company team should be constructed if development models are to be widely used. This team should be used to plan and implement the use of development models efficiently and ensure that the data produced is communicated effectively and is of the maximum value to the participants.

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10

Weimer, Richard George Jr. "Centrifugal pump performance prediction using quasi-three-dimensional flow analysis". Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/17693.

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11

Kaupert, Kevin A. "Unsteady flow fields in a high specific speed centrifugal pump /". Zürich, 1997. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=12068.

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12

Wahba, Waleed A. "Design optimisation of centrifugal pump impellers using parallel genetic algorithm". Thesis, Cranfield University, 2001. http://dspace.lib.cranfield.ac.uk/handle/1826/10708.

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Computational Fluid Dynamics (CFD) techniques have settled to a stage, where it is possible to gain significant insight into fluid flow processes of turbomachinery. However, the purpose of fluid dynamics naturally goes beyond improved understanding to the aim of improving the performance of the engineering systems. Consequently, the present thesis investigates the use of a automated design optimisation method using CFD. This presents a new design method for a important turbomachinery part, blade profiles of centrifugal pump impellers, based on a shape optimisation algorithm in combination with CFD. The use of genetic algorithms in shape optimisation dose not allow the design engineer to use any derivative information on the evolution of the shape, but only simple evaluation techniques. A optimisation library (GAlib), based on a genetic algorithm (GA), was used. GA controls the evolution of a population of profiles towards an optimum design. The optimisation process can handle simple objectives as well as conicting ones. The fitness value of each population element is evaluated using a CFD flow solver (Mac_LNS) based on nite-difference discretisation of the incompressible, Navier-Stokes (N-S) equations on structured polar-coordinate meshes. A number of design examples have been developed and the behaviour of the genetic algorithm has been tested using different kinds of objective functions. I addition, the algorithm was tested with a multi-objective mction. Bézier curves were selected to represent the impeller profile. A symmetric profile, identical profile for the pressure side (PS) and suction side (SS), was used as a basic shape to generate the population elements. GAlib was modified to run as a parallel algorithm using Message Passing Interface (MPI). It is indicated that parallelisation using MPI is good technique to overcome the time taken by GA and CFD, and quite good optimisation convergence criteria was obtained by using parallelisation. The obtained results show that the genetic algorithm is capable of achieving satisfactory designs of centrifugal impeller blade profiles effectively and with a minimum amount of user expertise.

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13

Aknouche, Sebastien 1979. "Impact of tip clearance flow on centrifugal pump impeller performance". Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/82254.

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14

Wahba, Waleed. "Design optimisation of centrifugal pump impellers using parallel genetic algorithm". Thesis, Cranfield University, 2001. http://dspace.lib.cranfield.ac.uk/handle/1826/10708.

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Computational Fluid Dynamics (CFD) techniques have settled to a stage, where it is possible to gain significant insight into fluid flow processes of turbomachinery. However, the purpose of fluid dynamics naturally goes beyond improved understanding to the aim of improving the performance of the engineering systems. Consequently, the present thesis investigates the use of a automated design optimisation method using CFD. This presents a new design method for a important turbomachinery part, blade profiles of centrifugal pump impellers, based on a shape optimisation algorithm in combination with CFD. The use of genetic algorithms in shape optimisation dose not allow the design engineer to use any derivative information on the evolution of the shape, but only simple evaluation techniques. A optimisation library (GAlib), based on a genetic algorithm (GA), was used. GA controls the evolution of a population of profiles towards an optimum design. The optimisation process can handle simple objectives as well as conicting ones. The fitness value of each population element is evaluated using a CFD flow solver (Mac_LNS) based on nite-difference discretisation of the incompressible, Navier-Stokes (N-S) equations on structured polar-coordinate meshes. A number of design examples have been developed and the behaviour of the genetic algorithm has been tested using different kinds of objective functions. I addition, the algorithm was tested with a multi-objective mction. Bézier curves were selected to represent the impeller profile. A symmetric profile, identical profile for the pressure side (PS) and suction side (SS), was used as a basic shape to generate the population elements. GAlib was modified to run as a parallel algorithm using Message Passing Interface (MPI). It is indicated that parallelisation using MPI is good technique to overcome the time taken by GA and CFD, and quite good optimisation convergence criteria was obtained by using parallelisation. The obtained results show that the genetic algorithm is capable of achieving satisfactory designs of centrifugal impeller blade profiles effectively and with a minimum amount of user expertise.

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15

Kabamba, Batthe Matanda. "Evaluation of centrifugal pump performance derating procedures for non-Newtonian slurries". Thesis, Cape Peninsula University of Technology, 2006. http://hdl.handle.net/20.500.11838/2170.

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Thesis (MTech(Civil Engineering))--Cape Peninsula University of Technology, 2006.
The performance of a centrifugal pump is altered for slurry or viscous materials (Stepanoff, 1969) and this needs to be accounted for. Usually, the suitable selection and evaluation of centrifugal pumps is based only on water pump performance curves supplied by the pump manufacturer (Wilson, Addie, Sellgren & Clift, 1997). In 1984 Walker and Goulas conducted a number of pump performance tests with kaolin clay slurries and coal slurries on a Warman 4/3 AH horizontal slurry pump and a Hazleton 3-inch B CTL horizontal pump (Walker and Goulas, 1984). Walker and Goulas have analysed the test data and correlated the performance derating both at the best efficiency flow rate (BEP) and at 10% of the best efficiency flow rate (0.1 BEP) to the modified pump Reynolds number (NRep). They have noticed that the head and the efficiency reduction ratio decreased for the pump Reynolds number less then 10⁶. Furthermore, Walker and Goulas obtained a reasonably good agreement (± 5%) between pump test data for non-Newtonian materials and pump performance prediction using the Hydraulics Institute chart. Sery and Slatter (2002) have investigated pump deration for non-Newtonian yield pseudoplastic materials. The NRep was calculated using the Bingham plastic viscosity (µp). Results have shown good agreement with regard to head and efficiency reduction ratios in comparison with previous work. However, Sery and Slatter's pump performance correlation using the HI chart did not reach the same conclusion. Error margin of ± 20% and ± 10% were found for head and efficiency respectively. This study is an attempt to reconcile the differences between Walker and Goulas (1984) and Sery and Slatter (2002) and extend the evaluation of these derating methods to pseudoplastic materials. The test work was conducted in the Flow Process Research Centre laboratory of the Cape Peninsula University of Technology using two centrifugal pumps; a Warman 6/4 and a GrW 4/3. The materials used were water, CMC solution bentonite and kaolin suspension at different concentrations (7% and 9% by weight for bentonite; 5%, 6% and 7% by weight for CMC; 17%, 19% and 21% by volume for kaolin).

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16

Selby, Normajean. "STATE-VARIABLE FEEDBACK CONTROL OF A MAGNETICALLY SUSPENDED CENTRIFUGAL BLOOD PUMP". University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1185567515.

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17

Moody, Kayla H. "Efficiency Evaluation of a Magnetically Driven Multiple Disk Centrifugal Blood Pump". VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4384.

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Heart failure is expected to ail over 8 million people in America by 2030 leaving many in need of cardiac replacement. To accommodate this large volume of people, ventricular assist devices (VADs) are necessary to provide mechanical circulatory support. Current VADs exhibit issues such as thrombosis and hemolysis caused by large local pressure drops and turbulent flow within the pump. Multiple disk centrifugal pumps (MDCPs) use shearing and centrifugal forces to produce laminar flow patterns and eliminate large pressure drops within the pump which greatly reduce risks that are in current VADs. The MDCP has a shaft drive system (SDS) that causes leakage between the motor and housing that when implanted can cause blood loss, infection, thrombosis and hemolysis. To eliminate these adverse effects, a magnetic external motor-driven system (MEMDS) was implemented. An efficiency study was performed to examine the efficacy of the MEMDS by comparing the hydraulic work of the MDCP to the power required to run the pump. This was done by measuring inlet and outlet pressures, outlet flow rate and input current at various input voltages and resistances. The results showed the MDCP could produce physiologic flow characteristics with a flow rate of 4.90 L/min and outlet pressure of 61.33 mmHg at an impeller speed of 989.79 rpm. Other VADs generate flow rates around 5 L/min at rotational speeds of 2400 rpm for centrifugal pumps and 12000 rpm for axial pumps. When compared to the SDS, the MEMDS exhibited similar efficiencies of 3.89% and 3.50% respectively. This study shows promise in the advancement of MDCP.

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18

Kono, Satoshi. "Auto-synchronized systolic unloading during left ventricular assist with centrifugal pump". Kyoto University, 2002. http://hdl.handle.net/2433/149348.

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19

Semenzin, Clayton S. "Determination of Centrifugal Blood Pump Characteristics using CFD and Experimental Analysis". Thesis, Griffith University, 2021. http://hdl.handle.net/10072/401348.

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Background Cardiovascular diseases are the leading cause of death throughout the developed world, attributed to approximately 17.8 million deaths worldwide in 2017 with increasing prevalence due to the aging population. Cardiovascular diseases generally result in heart failure. While the best treatment option for heart failure patients is heart transplantation, there is a severe deficiency in the availability of donor hearts. Rotary Blood Pumps (RBPs) utilised as Ventricular Assist Devices (VADs) provide an alternative treatment option. These devices are small implantable pumps that support the failing heart by providing power to augment circulation. The development of RBPs generally begins with initial designs obtained using traditional pump design methods (such as that developed by Stepanoff). However, studies have shown that this approach produces RBP prototypes far from optimal in design. Traditional theory relies on design constants derived empirically for large industrial pumps and these do not scale down well when applied to the much smaller RBPs. The initial designs are therefore generally quite poor and require an iterative build-and-test approach to obtain suitable pump prototypes – a process that is expensive and time consuming. Therefore, by improving the methodology for obtaining initial designs to better reflect the final product, development time can be greatly reduced. A popular avenue for analysing the effect of design variations and to further develop early prototypes of RBPs is to employ Computational Fluid Dynamics (CFD) simulations. These numerical simulations provide detailed data regarding the flow fields within these devices. However, a range of simulation options is available, leading to a wide range of potential predictions. In an attempt to provide a benchmark case, the FDA presented a challenge in which a pump design and test conditions were defined, allowing for direct comparison amongst different simulation approaches from a number of labs/RBP developers. The purpose of this thesis was to produce a gross design tool to provide a good starting point in RBP prototyping and a CFD simulation approach for verification that can also be used as a design refinement tool. Methods Formulating a design method for pumps requires the generation of empirical data. A number of pump design variables was identified as having an impact on pump performance, and a large number of experimental tests would have been needed to test the influence of each. Instead, a Design of Experiments (DOE) was utilised to streamline the process. The DOE outputs a relatively small number of tests required to fit a statistical model. Each design specified by the DOE was examined experimentally using a custom-built automated pump test platform to generate a number of performance measures. The obtained results were used to formulate a Response Surface Method (RSM) statistical model that showed acceptable fit to the input data. Coupled with desirability functions, the RSM model allowed for design optimisation. This tool essentially replaces Stepanoff’s traditional design methodology. The RSM model provides a robust tool that allows the user flexibility in design optimisation goals. The FDA pump was investigated in this thesis and a wide variety of simulation approaches was examined to determine which was most accurate. A range of factors were considered which included: mesh density, interface position between the rotating and stationary zones, steady vs. transient simulations, discretisation schemes, time step size and choice of turbulence model. The most appropriate option from each investigative study was selected to determine a recommended simulation approach. Final simulations were performed using these recommendations and were compared to the FDA experimental results to confirm the suitability of the suggested settings. Determination of Centrifugal Blood Pump Characteristics using CFD and Experimental Analysis iii The statistical model developed was used to design two different impellers as validation test cases. The first impeller was designed to optimise the maximum efficiency, P – Q curve slope and efficiency consistency. The second impeller was designed to mimic the approach used in traditional design methods for RBPs in setting a target design point as the primary objective and the aforementioned factors (from the first impeller) as secondary objectives. These two case studies underwent statistical performance predictions, CFD simulations, PIV analysis and experimental hydraulic testing to validate the statistical and CFD models. Results From the initial CFD study, a hybrid SBES turbulence model with full transient simulation on a fine grid with small time steps proved to be the most suitable both in terms of pressure rise generated by the FDA pump and resulting velocity fields when compared to published experimental results. From these findings the CFD modelling strategy was established. CFD results for the two validation pumps showed pressure rises matching the experimental data (8% and 1% difference for each impeller) within an acceptable range (<10% from the mean). The simulated velocity fields also closely replicated the PIV data for the majority of the flow domain. The statistical performance predictions well reflected those measured experimentally with the majority of data points falling within its confidence intervals. The hydraulic results also supported the main goal of this thesis, whereby an impeller generated using the statistical model, operated far closer to the target design point than that of a blood pump designed following Stepanoff’s methodology. Overall, both the statistical model and CFD approach provided accurate predictions and the purpose of the thesis was achieved. Final Remarks The statistical and CFD models developed in this thesis yield an effective design tool and verification methodology and show improvement over the current traditional design methods and accuracy in simulated results. Ultimately, the utilisation of these tools will lead to a reduction in the development time for new RBPs and provide a good understanding of the flow dynamics within these pumps, leading to improved pump designs reaching patients sooner. These tools are readily generalizable and could be adopted as design tools now.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
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20

Yue, Brian (Brain J. ). "The development of a multistage centrifugal pump for use in flow chemistry". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112530.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 44).
Flow chemistry is an emerging approach to chemical synthesis in which chemical processes are performed on reactants as they continuously flow through reactors. In order to drive such flows, low flow rate, high pressure pumps are used. The standard pump in use is the displacement pump. However, it tends to be expensive and produces a discontinuous flow. The goal of this investigation is to prototype a miniature multistage centrifugal pump and assess whether or not such pumps can perform in flow chemistry applications in the place of displacement pumps. This thesis explores the design features implemented in the development of this pump and how they contributed to its performance as pertaining to use in flow chemistry. Specifically, the pump was designed to be comprised of modularly stackable pump stages and to be thermochemically stable, operating without the use of dynamic seals. Ultimately, the device designed succeeded in being modularly stackable and in operating without dynamic seals. However, the target pressure rise per stage was not fully met. Moreover, testing of the pump revealed a high sensitivity in flow rate to changes in generated pressure head. Thus, it is not yet deemed a viable alternative to the current standard of displacement pumps.
by Brian Yue.
S.B.

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21

Al-Obaidi, Ahmed. "Experimental and numerical investigations on the cavitation phenomenon in a centrifugal pump". Thesis, University of Huddersfield, 2018. http://eprints.hud.ac.uk/id/eprint/34513/.

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Centrifugal pumps play an important role in engineering applications since they are commonly used in industrial and residential systems, covering wide range of flow rates. Improving the performance of turbomachines such as the centrifugal pumps can be difficult to achieve, since the flow is turbulent with unsteady behaviour and cavitation. Cavitation is a complex phenomenon that is commonly considered as one of the main causes of deterioration in pump performance. Diagnosing cavitation and detecting its level of severity are essential for maintaining the pump’s reliability. Continuous condition monitoring of the pump is important to increase its operational life, decrease maintenance costs and hence, enhance the reliability of the pump. Early detection of cavitation can also improve the pump’s life expectancy by adopting various preventative actions. In this research, the first technique used for detecting cavitation is Computational Fluid Dynamics because it can provide suitable visualisation and reasonably accurate information, regarding the behaviour of fluid flow in the pump. In this work, both qualitative and quantitative analyses were carried out through a wide range of operating conditions and different geometrical configurations of a centrifugal pump under single-phase and cavitation conditions. Both, global and local flow field characteristics were investigated for better understanding. For qualitatively analysis, contours of static pressure and velocity magnitude under single-phase conditions and vapour volume fractions contour under cavitation conditions were adopted. On the other hand, the head and pressure variation in both time and frequency domains were analysed for qualitative analysis. The results showed that, as the pump rotational speed, number of impeller blades, and the outlet impeller diameter increase the head of the pump increases as well as the occurrence of cavitation. Based on the extensive numerical investigations for variety of operational and geometrical parameters, novel semi-empirical correlations under single-phase and cavitation conditions for the pump head and power coefficients were developed. Developments of aforementioned relations were carried out using multiple regression analysis technique. The second and third research areas consist of an extensive experimental analysis on the effects of operating conditions on the pump performance to predict cavitation using vibration and acoustic signature analyses. Detailed experimental investigations were carried out for the detection and diagnosis of cavitation, with the aid of sophisticated equipment and sensors. The condition monitoring was experimentally carried out in both, time and frequency domains analyses. Time domain method was applied to analyse the vibration and acoustic signals in time waveform analysis (TWFA). These signatures were analysed using different statistical parameters such as peak, root mean square (RMS), peak-to-peak and variance. In addition, transforming and analysing these signals in frequency domain was made by using Fast Fourier Transform technique. Analyses of these signals in frequency domain were also carried out using different statistical parameters such as mean and RMS features under wide various frequency ranges. The results revealed that using cavitation detection index (CDI) was a powerful technique, which can be used in both time and frequency domains for detecting cavitation and comparing the sensitivity of the vibration and acoustic techniques in estimating earlier stage of cavitation. Moreover, vibration technique was more sensitive to detect different levels of cavitation, especially inception of cavitation as compared to acoustic technique. This research has also found that the range of frequency between 0Hz to 15kHz was more sensitive to detect cavitation in the pump at the early stages. However, further investigation indicated that a frequency range of 1Hz to 2kHz was also effective on predicting the cavitation. Based on these findings, it can be suggested to use low range of frequency sensors (accelerometer and microphone) to capture the cavitation phenomenon instead of higher range of frequency, which are more expensive. In addition, it was found that all three techniques adopted in this investigation such as; CFD, vibration and acoustic techniques are well capable to analyse cavitation behaviours under different operating conditions. Moreover, it was observed that the numerical results and vibration technique can detect the inception of cavitation within a pump earlier than the acoustic technique. The results also revealed that, the combined use of these techniques (numerical and experimental) could increase the reliability. The combined method can be a considered to be a robust method, which can provide detailed information about the performance of the pump and detection/diagnosis of cavitation within a centrifugal pump. Hence, this will assist in prolonging the life of the pump and protect the system from emergency shutdown.

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22

Singh, Rahul. "Inclusion of Blockage Effects in Inverse Design of Centrifugal Pump Impeller Blades". University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1427813446.

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23

Jery, Belgacem Brennen Christopher E. Brennen Christopher E. Acosta Allan J. Caughey Thomas Kirk. "Experimental study of unsteady hydrodynamic force matrices on whirling centrifugal pump impellers /". Diss., Pasadena, Calif. : California Institute of Technology, 1987. http://resolver.caltech.edu/CaltechETD:etd-03262007-130547.

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24

Altiparmak, Duran. "Factors affecting the swirl at entry to the balance drum in a centrifugal pump". Thesis, Heriot-Watt University, 1993. http://hdl.handle.net/10399/1466.

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25

Levchenko, K. V. "The investigation of radial oscillations of the centrifugal pump rotor in annular seals". Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/33694.

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The centrifugal pumps and compressors have obtained a widespread application in industry. To a considerable degree, their technical development is defined by vibroacoustic parameters that depend on the vibrational state of the rotor. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/33694

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26

Silva, Lima Jose Aldo. "A numerical model for three dimensional viscous flows aimed at centrifugal pump impellers". Thesis, Cranfield University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332933.

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27

Sahalaeva, S. A. "The investigatin of angular oscillations of the centrifugal pump rotor in annular seals". Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25888.

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28

Levchenko, K. "The investigation of radial oscillations of the centrifugal pump rotor in annular seals". Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25860.

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29

Kent, Jason A. "Numerical and Experimental Analysis of a TurboPiston Pump". ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1189.

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The TurboPiston Pump was invented to make use of merits such as, high flow rates often seen in centrifugal pumps and high pressures associated with positive displacement pumps. The objective of this study is to manufacture a plastic model 12â€ TurboPiston Pump to demonstrate the working principle and a metal prototype for performance testing. In addition, this research includes the study of the discharge valve to estimate the valve closing time and fluid mass being recycled back into the cylinder through hand calculations. Furthermore, a transient simulation was performed in CFD using Fluent to provide a better estimate of what will happen in the actual pump while running. Additionally, an experimental rig was designed to investigate the performance of the first generation valve on the TurboPiston Pump known as the flapper valve. Means to improve the hydrodynamic performance of both valves have been identified for future study.

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30

Калініченко, Павло Михайлович, Павел Михайлович Калиниченко, Pavlo Mykhailovych Kalinichenko, С. И. Санин e А. В. Супрун. "Жесткостная характеристика уравновешивающих устройств". Thesis, Издательство СумГУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/7829.

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31

Каплун, Ігор Петрович, Игорь Петрович Каплун, Ihor Petrovych Kaplun, Світлана Олегівна Лугова, Светлана Олеговна Луговая, Svitlana Olehivna Luhova e О. В. Карапузова. "Інноваційні методи створення нових проточних частин відцентрових насосів". Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25525.

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32

Павленко, Іван Володимирович, Иван Владимирович Павленко, Ivan Volodymyrovych Pavlenko e С. О. Фурманов. "Надійність запірного урівноважувального пристрою відцетрового насоса". Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25854.

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Марцинковський, Володимир Альбінович, Владимир Альбинович Марцинковский, Volodymyr Albinovych Martsynkovskyi e А. О. Усенко. "Дослідження динаміки урівноважуючого пристрою з урахуванням нестаціонарності течії у дроселюючих каналах відцентрового насосу". Thesis, Вид-во СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/5934.

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34

Павленко, Іван Володимирович, Иван Владимирович Павленко, Ivan Volodymyrovych Pavlenko e О. В. Заріцька. "Запобігання виникнення автоколивань запірного урівноважувального пристрою відцентрового насоса". Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25877.

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35

Павленко, Іван Володимирович, Иван Владимирович Павленко, Ivan Volodymyrovych Pavlenko e С. С. Крючков. "Оцінювання геометричних і гідромеханічних параметрів автоматичної системи осьового урівноваження ротора відцентрового насоса". Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25879.

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У сучасному насособудуванні висуваються підвищені вимоги до обладнання, що обумовлено невпинним зростом робочих параметрів і енергоємності, ускладненням умов роботи. Збільшення навантажень на основні вузли потребує проведення ретельних проектних розрахунків. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/25879

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36

Тарасевич, Юлія Ярославівна, Юлия Ярославовна Тарасевич, Yuliia Yaroslavivna Tarasevych e А. Є. Савченко. "Вплив випадкової зміни параметрів системи "ротор-шпарпинні ущільнення" на вібраційні характеристики відцентрового насоса". Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25969.

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37

Марцинковський, Володимир Альбінович, Владимир Альбинович Марцинковский, Volodymyr Albinovych Martsynkovskyi e Н. П. Кириллова. "Радиально-осевые колебания ротора центробежного насоса с автоматическим уравновешивающим устройством". Thesis, Издательство СумГУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/7871.

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38

Беда, Іван Микитович, Иван Никитич Беда, Ivan Mykytovych Beda, Ю. І. Довгорукий, Є. О. Козирєв, Олександр Іванович Беда, Александр Иванович Беда e Oleksandr Ivanovych Beda. "Вплив обертання вала на витік та пружну силу шпаруватого ущільнення". Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/8113.

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Надійність і довговічність відцентрових насосів визначається, перш за все, вібраційним станом. На коливання ротора відцентрового насоса в значній мірі впливають гідродинамічні сили, що діють у шпаруватих ущільненнях. Від цих сил у великій мірі залежать динамічні характеристики роторів. Досліджуючи рух рідини у шпаруватому ущільненні багато дослідників використовують разом з рівнянням нерозривності рівняння осьового руху рідини, нехтуючи обертанням вала. В даній роботі проведені дослідження впливу обертання вала на витік та пружну силу, яка виникає в шпаруватому ущільненні. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/8113

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39

Павленко, Іван Володимирович, Иван Владимирович Павленко, Ivan Volodymyrovych Pavlenko e С. С. Крючков. "Оцінювання параметрів автоматичних систем осьового урівноваження роторів відцентрових насосів за результатами експериментальних досліджень". Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/7886.

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40

Зуєва, Наталія Вікторівна, Наталья Викторовна Зуева, Nataliia Viktorivna Zuieva e А. С. Гончаренко. "Статический и динамический расчет автоматического устройства осевого уравновешивания ротора центробежного насоса". Thesis, Изд-во СумГУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/5926.

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41

Марченко, Анна Вікторівна, Анна Викторовна Марченко e Anna Viktorivna Marchenko. "Параметризація моделі дифузорного блоку напрямного апарату відцентрового насосу". Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/31630.

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Розроблена параметризована модель ДБ НА проміжного ступеня легко піддається процесу модифікації шляхом заміни вхідних параметрів. Розроблення моделей всіх блоків НА дозволить сформувати базу для геометричного моделювання відвідних пристроїв різних конструктивних виконань. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/31630
The features of the three-dimensional modeling of the guiding device of an intermediate stage of a multistage radial-flow pump are examined under the conditions of block-moduler designing. The method of the parameterization of typical blocks guiding devices of a radial-flow pump is examined. The results are presented as system of size relationships nonlinear equations for the diffuser bloc model. The modern CAD systems are used. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/31630

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42

Косторний, Сергій Дмитрович, Сергей Дмитриевич Косторной, Serhii Dmytrovych Kostornyi, Олександр Олександрович Чаплигін, Александр Александрович Чаплыгин e Oleksandr Oleksandrovych Chaplyhin. "Автоматизированное проектирование проточной части центробежного насоса". Thesis, Издательство СумГУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/8118.

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43

Чаплигін, Олександр Олександрович, Александр Александрович Чаплыгин, Oleksandr Oleksandrovych Chaplyhin e М. А. Ковалева. "Расчет поля скоростей равноскоростного потока в проточной части центробежного насоса". Thesis, Издательство СумГУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/8128.

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44

Тарасевич, Юлія Ярославівна, Юлия Ярославовна Тарасевич, Yuliia Yaroslavivna Tarasevych e Е. С. Кривопишина. "Оценка вероятности неразрушения вала центробежного насоса в условиях эксплуатации". Thesis, Издательство СумГУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/8039.

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45

Павленко, Іван Володимирович, Иван Владимирович Павленко, Ivan Volodymyrovych Pavlenko e О. В. Заріцька. "Автоколивання системи осьового урівноваження ротора відцентрового насоса". Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/7821.

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46

Тарасевич, Юлія Ярославівна, Юлия Ярославовна Тарасевич, Yuliia Yaroslavivna Tarasevych e О. С. Кривопишина. "Імовірнісний метод оцінки характеристик міцності ротора відцентрового насоса". Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25976.

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Бондарев, А. О. "Численное решение прямой 3Д-задачи в проточной части центробежного насоса". Thesis, Издательство СумГУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/25530.

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Тарасевич, Юлія Ярославівна, Юлия Ярославовна Тарасевич, Yuliia Yaroslavivna Tarasevych e А. Є. Савченко. "Витратні характеристики шпаринних ущільнень з урахуванням випадкової зміни їх параметрів". Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/8000.

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49

Рибалка, Павло Валерійович, Павел Валерьевич Рыбалка e Pavlo Valeriiovych Rybalka. "Increasing efficiency of machining high-precision holes with noncontinuous surfaces". Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46876.

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This paper is about a center hole with noncontinuous surface of a centrifugal pump impeller. The main subject is deviation of cylindrical shape of an impeller center hole and its concentricity to sealing surfaces. The purpose is finding a logarithm of getting precise cylindrical shape of the hole.

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Hliboký, Samuel. "Studie nestacionárních jevů čerpadla v turbínovém režimu". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444276.

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This diploma thesis deals with centrifugal pump running as a turbine. Basic working principles of a pump are included, both in pump and turbine regime. Experimental data obtained from laboratory test bed are compared with CFD simulation on slightly simplified geometry. Obtained results are then processed using spectrogram. Influence of time step and mesh size on results is also researched.

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