Relevant bibliographies by topics / Turbomachines Turbomachines Turbine pumps

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Turbomachines Turbomachines Turbine pumps'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Turbomachines Turbomachines Turbine pumps"

1

Kurz, Rainer. "Natural Gas." Mechanical Engineering 133, no. 04 (2011): 52. http://dx.doi.org/10.1115/1.2011-apr-7.

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This article discusses the importance of gas turbines, centrifugal compressors and pumps, and other turbomachines in processes that bring natural gas to the end users. To be useful, the natural gas coming from a large number of small wells has to be gathered. This process requires compression of the gas in several stages, before it is processed in a gas plant, where contaminants and heavier hydrocarbons are stripped from the gas. From the gas plant, the gas is recompressed and fed into a pipeline. In all these compression processes, centrifugal gas compressors driven by industrial gas turbines or electric motors play an important role. Turbomachines are used in a variety of applications for the production of oil and associated gas. For example, gas turbine generator sets often provide electrical power for offshore platforms or remote oil and gas fields. Offshore platforms have a large electrical demand, often requiring multiple large gas turbine generator sets. Similarly, centrifugal gas compressors, driven by gas turbines or by electric motors are the benchmark products to pump gas through pipelines, anywhere in the world.
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Manservigi, Lucrezia, Mauro Venturini, and Enzo Losi. "Optimal selection of pumps as turbines for maximizing electrical energy production." E3S Web of Conferences 238 (2021): 01005. http://dx.doi.org/10.1051/e3sconf/202123801005.

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A Pump as Turbine (PAT) is a renewable energy technology that can be a cost-effective and reliable alternative to hydraulic turbines in micro and small hydropower plants. In order to further favour PAT exploitation, a general procedure that allows the identification of the most suitable turbomachine to install is required. To this purpose, this paper develops a novel methodology aimed at selecting the best PAT that, among several alternatives, maximizes energy production. The methodology comprises two steps, which only require the knowledge of the best efficiency point of the considered pump and the hydraulic parameters of the site. The novel methodology is validated in this paper by calculating the electrical energy production of a simulated water distribution network coupled with several PATs, whose performance curves, both in direct and reverse modes, are taken from the literature. For the sake of generality, the considered turbomachines account for different geometrical characteristics, rotational speeds and operating ranges.
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Arsiri, Vasyl, and Oleg Kravchenko. "Reconstruction of Turbomachines on the Basis of the Flow Structure Visual Diagnostics." Mechanics and Mechanical Engineering 22, no. 2 (2020): 405–14. http://dx.doi.org/10.2478/mme-2018-0032.

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AbstractThe indicator of the quality of modern turbomachines is only the coefficient of efficiency, which characterizes the ratio of the useful work of compressors or fans to the energy expended on the drive. For the analysis of the quality of the motion, processes in flow parts, the values of resistances are used which are difficult to be considered as an indicator of the efficiency of dynamic processes. The report presents the results of visual diagnostics of the structure of flows during the movement in the elements of turbomachines, as well as options for improving the geometry of the flow parts - in the inlet pipes, impellers.For the analysis of the efficiency of the motion of liquids and gases in flowing parts, a calculated index is proposed - the coefficient of hydraulic efficiency of dynamic processes. The joint use of two indicators - the efficiency of transformation of different types of energy (efficiency of turbomachines) and the efficiency of dynamic processes in flowing parts allows us to develop and to analyze the results of reconstruction of turbomachines. Reconstruction of turbomachines with the purpose of improving the geometry of the flow parts provides an increase in productivity of turbines, compressors, fans and pumps, while reducing the specific energy consumption for the processes of compression and transport of liquids and gases. Optimization of turbomachines flow parts based of flow structure visual diagnostics allows to reduce noise and vibration, as well as to solve other problems.
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Venturini, Mauro, Stefano Alvisi, Silvio Simani, and Lucrezia Manservigi. "Comparison of Different Approaches to Predict the Performance of Pumps As Turbines (PATs)." Energies 11, no. 4 (2018): 1016. http://dx.doi.org/10.3390/en11041016.

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This paper deals with the comparison of different methods which can be used for the prediction of the performance curves of pumps as turbines (PATs). The considered approaches are four, i.e., one physics-based simulation model (“white box” model), two “gray box” models, which integrate theory on turbomachines with specific data correlations, and one “black box” model. More in detail, the modeling approaches are: (1) a physics-based simulation model developed by the same authors, which includes the equations for estimating head, power, and efficiency and uses loss coefficients and specific parameters; (2) a model developed by Derakhshan and Nourbakhsh, which first predicts the best efficiency point of a PAT and then reconstructs their complete characteristic curves by means of two ad hoc equations; (3) the prediction model developed by Singh and Nestmann, which predicts the complete turbine characteristics based on pump shape and size; (4) an Evolutionary Polynomial Regression model, which represents a data-driven hybrid scheme which can be used for identifying the explicit mathematical relationship between PAT and pump curves. All approaches are applied to literature data, relying on both pump and PAT performance curves of head, power, and efficiency over the entire range of operation. The experimental data were provided by Derakhshan and Nourbakhsh for four different turbomachines, working in both pump and PAT mode with specific speed values in the range 1.53–5.82. This paper provides a quantitative assessment of the predictions made by means of the considered approaches and also analyzes consistency from a physical point of view. Advantages and drawbacks of each method are also analyzed and discussed.
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Barrio, R., J. Fernández, E. Blanco, J. Parrondo, and A. Marcos. "Performance characteristics and internal flow patterns in a reverse-running pump–turbine." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 3 (2011): 695–708. http://dx.doi.org/10.1177/0954406211416304.

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Vaneless centrifugal pumps are reversible turbomachines that can operate also as centripetal turbines in low and very low-head power plants. However, the general performance in reverse mode is difficult to predict since the internal flow patterns are different from pump mode and the performance characteristics are not usually provided by manufacturers. This article presents numerical and experimental investigations on the operation of a reverse-running pump–turbine. The numerical calculations were carried out by solving the full unsteady Reynolds-averaged Navier–Stokes equations with the commercial code Fluent for several flowrates between 20 per cent and 160 per cent of rated conditions and both modes of operation. A complementary series of experimental measurements were performed in a test rig in order to obtain the general characteristics of the machine in pump and turbine modes, with the purpose of validating the numerical predictions. Once validated, the numerical model was used to investigate the flow patterns at some significant locations by means of pressure and velocity contours, and also by vector maps. Additionally, the model allowed the estimation of the steady load on the impeller as a function of flowrate in both modes of operation. It was concluded that, while the radial load in reverse mode is three times smaller than in pump mode, the axial load can be up to 1.6 times larger.
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Sazonov, Yuri Appolonievich, Mikhail Albertovich Mokhov, Inna Vladimirovna Gryaznova, et al. "Prototyping and Study of Mesh Turbomachinery Based on the Euler Turbine." Energies 14, no. 17 (2021): 5292. http://dx.doi.org/10.3390/en14175292.

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This paper presents a scientific development aimed at improving the efficiency of turbomachines through the joint use of rotary-vane and vortex workflows. In the well-known Euler turbine, the rotor flow channels represent a set of curved pipes. The authors propose to consider in more detail the possibilities of using such rotating pipes in the implementation of an ejection (vortex) workflow. A hybrid pump was considered with the conclusion that its workflow can be described using two Euler equations. The results of computer simulation indicate that hybrid turbomachines are promising. The use of additive technology allowed the creation of micromodels of the Euler turbine with various rotor designs. Laboratory hydraulic tests showed that the liquid inlet to the rotor is possible in pulse mode. Laboratory tests of micromodels using compressed air showed that gas (or liquid) motion through curved pipes could be carried out from the rotor periphery to its center and then back, albeit through another curved pipe. The research results demonstrated that the scientific and technical potential of the Euler turbine is not yet fully unlocked, and research in this direction should continue. The study results are applicable in various industries including the energyeconomy, robotics, aviation, and water transport industries.
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Hasmatuchi, Vlad, Alin Bosioc, Sébastien Luisier, and Cécile Münch-Alligné. "A Dynamic Approach for Faster Performance Measurements on Hydraulic Turbomachinery Model Testing." Applied Sciences 8, no. 9 (2018): 1426. http://dx.doi.org/10.3390/app8091426.

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During the design and optimization of hydraulic turbomachines, the experimental evaluation of hydraulic performances beyond the best efficiency point and for off-design conditions remains essential to validate the simulation process and to finalize the development. In this context, an alternative faster method to measure the efficiency of hydraulic turbomachines using a dynamic approach has been investigated. The so-called “sliding-gate” dynamic measurement method has been adapted and implemented on the hydraulic test rig of the HES-SO Valais//Wallis, Sion, Switzerland. This alternative approach, particularly gainful for small-hydro for which the investment devoted to development is limited, has been successfully assessed on two cases for drinking water networks energy recovery. A 2.65 kW double-regulated laboratory prototype of a tubular axial micro-turbine with two independent variable speed counter-rotating runners and a 11 kW multi-stage centrifugal pump-as-turbine (PAT) with variable speed have been selected. The hydraulic efficiency results obtained by dynamic measurements are compared to the ones obtained by the classical steady point-by-point method. This dynamic method, suitable not only for hydraulic machinery, allows: (i) reducing significantly (up to 10×) the time necessary to draw the complete efficiency characteristics of a hydraulic machine; (ii) rapidly detecting the hydrodynamic instabilities within the operating range of the machine.
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Kumar, M. Sarath, and B. S. Prabhu. "Rotating Machinery Predictive Maintenance Through Expert System." International Journal of Rotating Machinery 6, no. 5 (2000): 363–73. http://dx.doi.org/10.1155/s1023621x00000348.

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Modern rotating machines such as turbomachines, either produce or absorb huge amount of power. Some of the common applications are: steam turbine-generator and gas turbine-compressor-generator trains produce power and machines, such as pumps, centrifugal compressors, motors, generators, machine tool spindles, etc., are being used in industrial applications. Condition-based maintenance of rotating machinery is a common practice where the machine's condition is monitored constantly, so that timely maintenance can be done. Since modern machines are complex and the amount of data to be interpreted is huge, we need precise and fast methods in order to arrive at the best recommendations to prevent catastrophic failure and to prolong the life of the equipment. In the present work using vibration characteristics of a rotor-bearing system, the condition of a rotating machinery (electrical rotor) is predicted using an off-line expert system. The analysis of the problem is carried out in an Object Oriented Programming (OOP) framework using the finite element method. The expert system which is also developed in an OOP paradigm gives the type of the malfunctions, suggestions and recommendations. The system is implemented in C++.
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Teo, C. J., and Z. S. Spakovszky. "Modeling and Experimental Investigation of Micro-hydrostatic Gas Thrust Bearings for Micro-turbomachines." Journal of Turbomachinery 128, no. 4 (2005): 597–605. http://dx.doi.org/10.1115/1.2219760.

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One major challenge for the successful operation of high-power-density micro-devices lies in the stable operation of the bearings supporting the high-speed rotating turbomachinery. Previous modeling efforts by Piekos (2000, “Numerical Simulation of Gas-Lubricated Journal Bearings for Microfabricated Machines,” Ph.D. thesis, Department of Aeronautics and Astronautics, MIT), Liu et al. (2005, “Hydrostatic Gas Journal Bearings for Micro-Turbo Machinery,” ASME J. Vib. Acoust., 127, pp. 157–164), and Spakovszky and Liu (2005, “Scaling Laws for Ultra-Short Hydrostatic Gas Journal Bearings,” ASME J. Vib. Acoust. 127, pp. 254–261) have focused on the operation and stability of journal bearings. Thrust bearings play a vital role in providing axial support and stiffness, and there is a need to improve the understanding of their dynamic behavior. In this work, a rigorous theory is presented to analyze the effects of compressibility in micro-flows (characterized by low Reynolds numbers and high Mach numbers) through hydrostatic thrust bearings for application to micro-turbomachines. The analytical model, which combines a one-dimensional compressible flow model with finite-element analysis, serves as a useful tool for establishing operating protocols and assessing the stability characteristics of hydrostatic thrust bearings. The model is capable of predicting key steady-state performance indicators, such as bearing mass flow, axial stiffness, and natural frequency as a function of the hydrostatic supply pressure and thrust-bearing geometry. The model has been applied to investigate the static stability of hydrostatic thrust bearings in micro-turbine generators, where the electrostatic attraction between the stator and rotor gives rise to a negative axial stiffness contribution and may lead to device failure. Thrust-bearing operating protocols have been established for a micro-turbopump, where the bearings also serve as an annular seal preventing the leakage of pressurized liquid from the pump to the gaseous flow in the turbine. The dual role of the annular pad poses challenges in the operation of both the device and the thrust bearing. The operating protocols provide essential information on the required thrust-bearing supply pressures and axial gaps required to prevent the leakage of water into the thrust bearings. Good agreement is observed between the model predictions and experimental results. A dynamic stability analysis has been conducted, which indicates the occurrence of instabilities due to flow choking effects in both forward and aft thrust bearings. A simple criterion for the onset of axial rotor oscillations has been established and subsequently verified in a micro-turbocharger experiment. The predicted frequencies of the unstable axial oscillations compare well with the experimental measurements.
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Vásquez, Diego Penagos, Jonathan Graciano Uribe, Sebastián Vélez García, and Jorge Sierra del Rio. "Characteristic Curve Prediction of a Commercial Centrifugal Pump Operating as a Turbine Through Numerical Simulations." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 83, no. 1 (2021): 153–69. http://dx.doi.org/10.37934/arfmts.83.1.153169.

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In this work, we seek to predict the characteristic curve of a commercial centrifugal radial flow pump operating as a turbine, applying a novel methodology based on the state of the art. Initially, the characteristic curve in pump mode is validated through numerical simulations. The results obtained are approximate to the points awarded by the manufacturer, with an error of less than 7% at the best efficiency point. Subsequently, the characteristic curve is generated in turbine mode, obtaining an error of less than 10% respect to mathematical model. Then, velocity and pressure contours are evaluated to validate the fluid dynamic behavior. Finally, the site operating conditions for electricity generation are obtained. With this, it is proposing a methodology for the selection of these turbomachines, applying an economic technology for zones that do not have access to the electrical energy, since it was not found a method that is being applied for its correct election in the hydroelectric generation at low scale.
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Dissertations / Theses on the topic "Turbomachines Turbomachines Turbine pumps"

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Wissinger, Gordon J. "Computational analysis of space transfer vehicle engine turbopump diffuser design for deep-throttling : by Gordon J. Wissinger /." Online version of thesis, 1991. http://hdl.handle.net/1850/11001.

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Yoshida, Brian Richard. "Compuational analysis of boundary layer control by suction in a space transfer vehicle engine turbopump diffuser /." Online version of thesis, 1992. http://hdl.handle.net/1850/11058.

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Pelton, Robert John. "One-Dimensional Radial Flow Turbomachinery Performance Modeling." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2192.pdf.

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Ozgen, Onur. "Design Improvements On Mixed Flow Pumps By Means Of Computational Fluid Dynamics." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12608093/index.pdf.

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The demand on high efficiency pumps leads the manufacturers to develop new design and manufacturing techniques for rotodynamic pumps. Computational Fluid Dynamics (CFD) software are started to be used during the design periods for this reason in order to validate the designs before the pumps are produced. However the integration process of CFD software into the design procedure should be made carefully in order to improve the designs. In this thesis, the CFD software is aimed to be integrated into the pump design procedure. In this frame, a vertical turbine type mixed flow pump is aimed to be designed and design improvements are intended to be made by applying numerical experimentations on the pump. The pump that is designed in this study can deliver 115 l/s flow rate against the head of 16 mWC in 2900 rpm. The effects of various parameters in the design are investigated by the help of CFD software during the design and best performance characteristics of the pump are aimed to be reached. The pump that is designed in this study is manufactured and tested in Layne Bowler Pumps Company Inc. The design point of the pump is reached within the tolerance limits given in the related standard. In addition, the results of actual test and numerical experimentation are compared and found to be in agreement with each other. The integration of CFD code to the design procedure is found quite useful by means of shortening design periods, lowering manufacturing and testing costs. In deed the effects of the design parameters are understood better by applying numerical experimentations to the designed pump.
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Yildiz, Mehmet. "Design And Performance Analysis Of A Pump-turbine System Using Computational Fluid Dynamics." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613761/index.pdf.

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In this thesis, a parametric methodology is investigated to design a Pump-Turbine system using Computational Fluid Dynamics ( CFD ). The parts of Pump-Turbine are created parametrically according to the experience curves and theoretical design methods. Then, these parts are modified to obtain 500 kW turbine working as a pump with 28.15 meters head. The final design of Pump-Turbine parts are obtained by adjusting parameters according to the results of the CFD simulations. The designed parts of the Pump-Turbine are spiral case, stay vanes, guide vanes, runner and draft tube. These parts are designed to obtain not only turbine mode properties but also pump mode properties.
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Cirit, Ali. "Design And Performance Evaluation Of Mixed Flow Pumps By Numerical Experimentation And Axial Thrust Investigation." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608972/index.pdf.

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In this thesis a vertical turbine mixed flow pump that has a flow rate of 40 l/s and 16 mwc head at 2900 rpm is designed. Effect of design parameters are investigated and flow inside the pump is analyzed with the help of numerical experimentations. The designed pump is manufactured and tested in Layne Bowler Pumps Company and completed in T&Uuml<br>BiTAK - TEYDEB project. Pump is designed in the tolerance limits that are defined in the standard TS EN ISO 9906. Numerical experimentation results for performance charecteristics show the same trend with the test results. In addition, axial thrust measurements are done on the designed pump with using load cells. Effect of balancing holes and balancing ring are investigated. Balancing holes are drilled at various diameters at the back side of the impellers and its effect is analyzed on the pump performance characteristics. Test results are compared with different approaches.
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Engin, Ertan. "Design, Construction And Performance Evaluation Of A Submersible Pump With Numerical Experimentation." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/12606532/index.pdf.

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Due to the increasing demand, nonclog type sewage pumps are designed and manufactured in large amounts all over the world. However, a methodology on the design of these special duty pumps is not encountered in the literature. Therefore, the manufacturers tend to develop their own empirical methodologies. In this thesis, a nonclog pump is designed and constructed on the basis of suitable approaches of known centrifugal pump design methods. In this frame, a nonclog type submersible pump that is capable of handling solids, up to a diameter of 80 mm is aimed to be designed. The designed pump delivers 100 l/s flow rate against a head of 24 m. The rotational speed of the pump is 1000 rpm. Design procedure and the important points that differ nonclog pump design from standard centrifugal pump designs are given. In addition, hydraulic characteristics of two nonclog pumps, one of which is the pump designed in this study, are investigated by means of computational fluid dynamics (CFD) code. The designed pump is manufactured and tested in Layne Bowler Pump Company Inc. The test result indicates that design point is reached with a deviation in the limits of the related standard. Wire to water total best efficiency obtained by the test is 60%. Close agreement between results of actual test and numerical experimentation performed by CFD code shows that CFD analysis is a quite useful tool in predicting the hydraulic characteristics of nonclog pumps. Moreover, the pump is tested at 750 rpm and the test results are found to be in good agreement with the similitude anaysis results.
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Hall, Benjamin F. "Combustor simulators for scaled turbine experiments." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:9c8e46e6-218f-4715-b2bd-8c8abbee446a.

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Gas turbine combustors employing a single lean combustion stage represent the next generation of design for reduced NO<sub>X</sub>emissions. These lean-burn combustors rely on swirl-stabilised flames resulting in highly non-uniform outflows. Non-uniform conditions adversely affect high-pressure turbine performance. 3D numerical simulations provide a means to understand and optimise engine design, however, the modelling of turbulence means experimental validation is crucial. Turbine test facilities operating at scaled, non-reacting conditions, with simulated combustor flows are an important source of validation data. This thesis presents advances in combustor simulator design, testing and instrumentation relevant to the challenges of modern, highly-integrated turbine testing. The design of a lean-burn combustor simulator, characterised by swirl and non-uniform temperature, is presented. The design was based on measurements and predictions of engine conditions. Unsteady numerical simulations were employed as a predictive design tool. An engine-scale combustor simulator was manufactured and characterised experimentally in a bespoke facility. Surveys of flow structure are presented, focusing on experimental turbine inlet data. These data confirmed that the combustor simulator reproduces the important features of a lean-burn combustor; e.g. swirling mainstream flow and high turbulence intensity. The lean-burn combustor simulator will be the first of its kind to be implemented in a rotating turbine test facility, and will provide important validation data. Measurement techniques were developed alongside the core work. Miniaturised five-hole probe rakes for turbine inlet measurements were developed using additive manufacturing (AM). Building on this work, an open source AM five-hole probe design is presented with experimental validation. The problem of estimating pressure probe bandwidth was also addressed, and a simplified model is presented. These tools have direct applications in turbomachinery research.
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Xu, Runsong. "Volute and diffuser performance analysis for high turning turbine system." Master's thesis, Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-07122002-134859.

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Jouini, Dhafer Ben Mahmoud Carleton University Dissertation Engineering Mechanical and Aerospace. "Experimental investigation of two transonic linear turbine cascades at off-design conditions." Ottawa, 2000.

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Books on the topic "Turbomachines Turbomachines Turbine pumps"

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Hendricks, Robert C. Straight cylindrical seal for high-performance turbomachines. National Aeronautics and Space Administration, Scientific and Technical Information Office, 1987.

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Hendricks, Robert C. Straight cylindrical seal for high-performance turbomachines. National Aeronautics and Space Administration, Scientific and Technical Information Office, 1987.

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Hendricks, Robert C. Three-step cylindrical seal for high-performance turbomachines. Lewis Research Center, 1987.

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Hendricks, Robert C. Three-step cylindrical seal for high-performance turbomachines. National Aeronautics and Space Administration, Scientific and Technical Information Office, 1987.

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Hendricks, Robert C. Three-step cylindrical seal for high-performance turbomachines. National Aeronautics and Space Administration, Scientific and Technical Information Office, 1987.

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Wislicenus, George F. Preliminary design of turbopumps and related machinery. NASA, Scientific and Technical Information Branch, 1986.

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Wislicenus, George F. Preliminary design of turbopumps and related machinery. National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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Armstrong, Elizabeth S. Computer-aided design analysis of 57-mm, angular-contact, cryogenic turbopump bearings. National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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Armstrong, Elizabeth S. Computer-aided design analysis of 57-mm, angular-contact, cryogenic turbopump bearings. National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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Armstrong, Elizabeth S. Computer-aided design analysis of 57-mm, angular-contact, cryogenic turbopump bearings. National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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Book chapters on the topic "Turbomachines Turbomachines Turbine pumps"

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Dick, Erik. "Pumps." In Fundamentals of Turbomachines. Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9627-9_8.

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Schobeiri, Meinhard T. "Efficiency of Multi-Stage Turbomachines." In Gas Turbine Design, Components and System Design Integration. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23973-2_7.

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Schobeiri, Meinhard T. "Efficiency of Multi-Stage Turbomachines." In Gas Turbine Design, Components and System Design Integration. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-58378-5_7.

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Watanabe, T., M. Aotsuka, and Y. Machida. "Vibration Characteristics of a Transonic Turbine Cascade." In Unsteady Aerodynamics and Aeroelasticity of Turbomachines. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5040-8_44.

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Sayma, A. I., M. Vahdati, J. S. Green, and M. Imregun. "Whole-Assembly Flutter Analysis of a Low Pressure Turbine Blade." In Unsteady Aerodynamics and Aeroelasticity of Turbomachines. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5040-8_23.

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Ferrand, P., S. Aubert, G. Oliveira, and L. Smati. "A Numerical Analysis of Wakes Propagation in Inviscid Flow of Turbine." In Unsteady Aerodynamics and Aeroelasticity of Turbomachines. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5040-8_3.

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Norryd, M., and A. Bölcs. "Experimental Investigation of Unsteady Pressure Behaviours in a Linear Turbine Cascade." In Unsteady Aerodynamics and Aeroelasticity of Turbomachines. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5040-8_7.

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Manwaring, Steven R., and Kevin L. Kirkeng. "Forced Response Vibrations of a Low Pressure Turbine Due to Circumferential Temperature Distortions." In Unsteady Aerodynamics and Aeroelasticity of Turbomachines. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5040-8_25.

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Panovsky, J., M. Nowinski, and A. Bölcs. "Flutter of Aircraft Engine Low Pressure Turbine Blades: Oscillating Cascade Experiments and Analysis." In Unsteady Aerodynamics and Aeroelasticity of Turbomachines. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5040-8_53.

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Bell, D. L., and L. He. "Three Dimensional Unsteady Flow Around a Turbine Blade Oscillating in Bending Mode — An Experimental and Computational Study." In Unsteady Aerodynamics and Aeroelasticity of Turbomachines. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5040-8_4.

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Conference papers on the topic "Turbomachines Turbomachines Turbine pumps"

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Juckelandt, Kay, and Frank-Hendrik Wurm. "Applicability of Wall-Function Approach in Simulations of Turbomachines." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42014.

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Numerical simulations of centrifugal pumps with low specific speed show significant differences in calculated efficiency from experiments. This causes designers to refrain from CFD methods and stick to prototyping. Investigations regarding the applicability of numerical simulations on these pumps are carried out. Unsteady simulations of a low specific speed pump are performed. The focus of this paper is boundary layer treatment, as losses due to boundary layer flow are dominant in low specific speed pumps. The wall-function as well as the low-Reynolds-number method is applied for boundary layer treatment. A method to calculate the local modeling error of the wall-function method is introduced. Experiments on a test pump are conducted to validate the simulations. Performance curves, locally highly resolved pressure distributions and velocity profiles are obtained. Simulations with resolved boundary layers match experimental data very good. It is shown that simulated efficiency is sensitive to the boundary layer treatment. The wall-function simulations deviate significantly at off-design flow rate, particularly at overload. The analysis reveals that modeling errors of the wall-function method mainly contribute to incorrect loss prediction. A local modeling error distribution is calculated and a meshing guideline for low specific speed pumps is derived.
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Jeanty, Freddy, Jesu´s De Andrade, Miguel Asuaje, et al. "Numerical Simulation of Cavitation Phenomena in a Centrifugal Pump." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78303.

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Cavitation is a common phenomenon that appears during the operation of the hydraulic turbomachines reducing performance and life of Centrifugal pumps. The main goal of this work is primarily a CFD-simulation of the whole Centrifugal Pump-Turbine including the suction cone, impeller, diffuser blades and volute, in order to characterize and evaluate its performance under cavitation conditions. The CFD simulations results were compared with experimental data under cavitation and non-cavitation conditions. A good agreement has been obtained under non-cavitation conditions for global performance parameters. After the implementation of the Rayleigh Plesset cavitation model, the required Net Positive Suction Head (NPSHr) has been predicted from CFD simulations. Finally, a full cavitation test can be reproduced for a Hydraulic Turbomachine to avoid this dangerous phenomenon.
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Fuller, R., J. Hemrle, and L. Kaufmann. "Turbomachinery for a Supercritical CO2 Electro-Thermal Energy Storage System." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95112.

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This paper presents analysis of CO2 turbomachinery for the electro-thermal energy storage (ETES) concept for site-independent bulk (grid-scale) electric energy storage. In charging mode, ETES operates as a transcritical CO2 heat pump, consuming electric energy which is converted into thermal energy stored in the form of hot water and ice on the hot and cold side of the cycle, respectively. On demand, the CO2 cycle is reversed for discharging during which ETES operates as transcritical CO2 power generation plant, consuming the stored hot and cold sources. The target capacity of the ETES system is of the order of units of MW electric to ∼100 MW electric, with typical daily cycles and 4 to 8 hours of storage. The estimated electric-to-electric round trip efficiency of ETES is about 60%. A companion paper [1] presents the control concept of the ETES plant and discusses several issues specific to the ETES plant design and operation. This paper analyzes these particular requirements from the perspective of the CO2 turbomachinery required for the storage plant, presenting the selection of the turbomachinery types and their shaft arrangement suitable for the ETES. The expected performance, main design features and challenges are discussed, together with questions related to the scalability of the turbomachines towards high power targets. Impacts of the turbomachinery designs on the ETES system performance, such as the sensitivity of the system electric-to-electric round trip efficiency on the turbomachinery efficiency are discussed.
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Teo, C. J., and Z. S. Spakovszky. "Modeling and Experimental Investigation of Micro-Hydrostatic Gas Thrust Bearings for Micro-Turbomachines." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68222.

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One of the major challenges for the successful operation of high-power-density micro-devices lies in the stable operation of the bearings supporting the high-speed rotating turbomachinery. Previous modeling efforts by Piekos [1], Liu et al. [2] and Spakovszky and Liu [3] have mainly focused on the operation and stability of journal bearings. However, since thrust bearings play the vital role of providing axial support and stiffness, there is a need to gain a fuller understanding of their behavior. In this work, a rigorous theory is presented to analyze the effects of compressibility in micro-flows (characterized by low Reynolds numbers and high Mach numbers) through hydrostatic thrust bearings for application to microturbomachines. The analytical model, which combines a 1-D compressible flow model with Finite-Element Analysis, serves as a useful tool for establishing operating protocols and assessing the stability characteristics of hydrostatic thrust bearings. The model is capable of predicting key steady-state performance indicators, such as bearing mass flow, axial stiffness and natural frequency as a function of the hydrostatic supply pressure and thrust bearing geometry. The model has been applied to investigate the static stability of hydrostatic thrust bearings in micro-turbine-generators, where the electrostatic attraction between the stator and rotor gives rise to a negative axial stiffness contribution and may lead to device failure. Thrust bearing operating protocols have been established for a micro-turbopump, where the bearings also serve as an annular seal preventing the leakage of pressurized liquid from the pump to the gaseous flow in the turbine. The dual role of the annular pad poses challenges in the operation of both the device and the thrust bearing. The operating protocols provide essential information for the required thrust bearing supply pressures and axial gaps required to prevent the leakage of water into the thrust bearings for various pump outlet pressures. Good agreement is observed between the model predictions and experimental results. In addition, a dynamic stability analysis is also performed, which indicates the occurrence of unstable axial oscillations due to flow choking effects in both forward and aft thrust bearings. These a-priori dynamic stability predictions were subsequently verified experimentally on a micro-turbocharger. The frequencies of unstable axial oscillations predicted using the model compare favorably to those determined experimentally, thus vindicating the validity of the model. A simple and useful dynamic stability criterion is established, where the occurrence of flow choking in both thrust bearings give rise to dynamic instability.
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Muhammed, Ameen R. A., and Dara W. Childs. "Vibration Modeling and Experimental Results of Two Phase Flow Twin-Screw Pump." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-44115.

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In turbomachines, the transfer of energy between the rotor and the fluid does not — in theory — result in lateral forces on the rotor. In positive displacement machines, on the other hand, the transfer of energy between the moving and stationary components usually results in unbalanced pressure fields and forces. In [1] the authors developed a model to predict the dynamic forces in twin screw pumps, showing that the helical screw shape generates hydraulic forces that oscillate at multiples of running speed. The work presented here attempts to validate the model in [1] using a clear-casing twin screw pump. The pump runs in both single and multiphase conditions with exit pressure up to 300 KPa and a flow rate 0.6 liter per second. The pump was instrumented with dynamic pressure probes across the axial length of the screw in two perpendicular directions to validate the dynamic model. Two proximity probes measured the dynamic rotor displacement at the outlet to validate the rotordynamics model and the hydrodynamic cyclic forces predicted in [1]. The predictions were found in good agreement with the measurements. The amplitude of the dynamic pressure measurements in two perpendicular plans supported the main assumptions of the model (constant pressure inside the chambers and linear pressure drop across the screw lands). The predicted rotor orbits at the pump outlet in the middle of the rotor matched the experimental orbits closely. The spectrum of the response showed harmonics of the running speed as predicted by the model. The pump rotor’s calculated critical speed was at 24.8 krpm, roughly 14 times the rotor’s running speed of 1750 rpm. The measured and observed excitation frequencies extended out to nine times running speed, still well below the 1st critical speed. However, for longer twin-screw pumps running at higher speed, the coincidence of a higher-harmonic excitation frequency with the lightly damped 1st critical speed should be considered.
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Dussourd, Jules L., Paul Hermann, and Paul E. Westhoff. "A Theory for the Hydrodynamic Performance of Centrifugal Pump Impellers in Stall." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-324.

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A computerized analysis is presented which may have the potential of calculating the performance of turbomachines operating in the stalled regime. The method however is still in its infancy in that here only radial impellers pumping incompressible fluids and working with the simplest of diffusers are considered. The physical model consists of a rotating cascade which admits forward flows as well as backflows existing concurrently, both described as time steady jets and wakes flowing on two stream surfaces which must be in equilibrium. The losses for non-reattaching flows are mainly the result of momentum exchanges, making it possible to develop a model somewhat, but not entirely free of empirical quantities. The sum of the physical constraints that must be satisfied form a system of nine simultaneous equations with nine variables. Their solutions are computerized for PC work. The output yields the internal pressures and velocity diagrams, including quantification of the forward and backward flows, suction line vortexing, cavitation and overall performance. To the extent that it could be explored to date, corroboration against test pumps measurements shows promising agreement using as criteria the absorbed power and in a more preliminary way, the intensity of the suction pipe phenomena and the head-flow curves when appropriate. The corroborations however have been carried out only for a few pumps.
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Casartelli, Ernesto, Luca Mangani, David Roos, and Armando Del Rio. "On the Application of the Full Reynolds Stress Model for Unsteady CFD in Hydraulic Turbomachines." In ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20398.

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Abstract The computation of the characteristic of hydraulic machines, both in pump and turbine mode, needs, when performed over a wide operating range, to take into account turbulence anisotropy. This because highly separated flows largely deviate from isotropic turbulence structures as assumed in RANS eddy viscosity models with the Boussinesq approximation. In this paper CFD computations were performed with anisotropic turbulence models in order to capture the characteristic and investigate flow structures phenomena. Experimental results are compared against the CFD simulations in order to validate the results. Specific occurring phenomena are highlighted and more complex flow structures are evident compared to those computed with standard eddy viscosity models. A in-house pressure based coupled solver was used for the CFD simulations. The code is a finite volume polyhedral CFD solver implemented in a C++ framework with the possibility to implement implicit and coupled algorithms. Second moment closure turbulence model have been successfully implemented with a standard and novel fully coupled algorithm. In the paper the advantage of the novel algorithm is presented for industrial applications. The fully coupled approach for the Reynolds Stress model allows stable simulations of transient and steady state hydraulic machines at any operating point, opening also new opportunities in obtaining high accurate results for anisotropic turbulent flows without the usage of hybrid LES/RANS models and without the model limitation of standard eddy viscosity models.
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Marineau, Eric C., and Marcelo Reggio. "A MATLAB Toolbox for the Intuitive Knowledge of Turbomachinery." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-28275.

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This paper presents the characteristics and the usefulness of a MATLAB toolbox in teaching the effects of the design parameters on the performance and characteristics of axial and radial compressors, turbines and pumps. The teaching and learning of the working principles of turbomachines are challenging subjects as the understanding and application of various concepts from fluid dynamics, thermodynamics and dimensional analysis are required. It is believed that the current toolbox will help students acquire durable and intuitive knowledge as it provides an effective discovery environment. In this environment, the users progressively gain insight into the laws and rules of a system by manipulating the variables and visualizing the resulting consequences. For each type of components, distinct sets of input variables can be chosen, each one corresponding to a different design problem. Based on the mean radius analysis and using the input parameters provided by the user, the toolbox provides a preliminary design. The results are displayed in different type of graphics such as velocity triangles, efficiency contours and a sketch of the designed turbomachine. The toolbox Graphical User Interface (GUI) insures user-friendliness such that the user can strictly focus on the content.
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9

Shrestha, Ujjwal, Jungwan Park, and Young-Do Choi. "Optimal Design of Reaction Hydro Turbine Model Stay Vane by Vane Angle and Thickness Distribution." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4611.

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Abstract Optimization is uprising technology in the engineering field, which enhance the performance of mechanical components. Likewise, upcoming turbomachinery designs need to be more efficient, cost-effective and easy manufacturing. Many optimization techniques have implemented for the development of efficient turbomachines. In this study, the optimization has mostly confined to the stay vane of reaction turbine like Francis, Pump Turbine etc. Stay vanes are mainly used to direct the flow towards guide vane and runner in the reaction type turbine (Francis, Pump Turbine). The three-dimensional flow field from the spiral casing is highly distorted, which causes secondary flow. However, the uniform flow field has maintained by stay vane. Due to steady flow field from stay vane, the performance of the runner has improved. Therefore, the better design of stay vane has been required for the improvement of the flow field around the runner passage. The design parameters of the stay vane are vane angle distribution and thickness distribution from leading edge to trailing edge. The vane angle distribution controls the stability of flow field direction and momentum towards the runner. Similarly, the thickness distribution will maintain the profile of the stay vane. The optimization of stay vane has improved turbine efficiency, flow uniformity, and pressure loss. The multi-objective genetic algorithm (MOGA) was selected for the optimization of stay vane because it satisfies all the objective functions without being dominated by any specific solution. MOGA is a more realistic approach to optimization. The validation test of performance is conducted to compare the result of experimental and numerical methods. The optimized stay vane has improved the flow uniformity around the stay vane.
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de Kleine, D., B. P. M. van Esch, J. G. M. Kuerten, and A. W. Vreman. "Calculation of Unsteady Flow in a Centrifugal Pump With Vaned Diffuser Using Staggered and Collocated Grid Methods." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78113.

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For the design of turbomachines like compressors, turbines, fans, and centrifugal pumps, more and more use is made of commercially available flow simulation software. To the authors best knowledge, in all cases discretization schemes based on a collocated grid are used. However, using a collocated grid method, the incompressible Navier-Stokes equations can suffer from odd-even decoupling. The adaptations necessary to suppress odd-even decoupling in incompressible flows result in calculations which are either less accurate or more time-consuming, especially for unsteady flows. In this paper we apply an alternative method based on a staggered-grid approach. The method is ideally suited for calculating unsteady incompressible flow on highly non-uniform block-structured grids. The unsteady flow in a radial pump with a vaned diffuser is calculated in 2D and compared with results obtained with a commercially available code. The time-dependent velocity and pressure fields are validated with experimental results available in literature.
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Reports on the topic "Turbomachines Turbomachines Turbine pumps"

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Haselbacher, Andreas, Michel Arnal, Maurizio Barbato, et al. Joint synthesis “Electricity storage via adiabatic air compression” of the NRP “Energy”. Swiss National Science Foundation (SNSF), 2020. http://dx.doi.org/10.46446/publication_nrp70_nrp71.2020.3.en.

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La fermeture des centrales nucléaires et le développement de l’énergie solaire et éolienne rendent la production d’électricité plus volatile. De nouveaux systèmes de stockage sont nécessaires pour s’assurer que l’électricité est disponible au moment où elle est nécessaire. Le stockage adiabatique d’air comprimé représente une technologie prometteuse. Il utilise l’excédent de production des installations solaires et éoliennes pour comprimer l’air ambiant et le stocker dans une cavité souterraine. Au besoin, l’air comprimé est à nouveau détendu et entraîne alors une turbine qui produit de l’électricité. En tirant profit de la chaleur générée lors de la compression, cette technologie atteint un rendement de 65 à 75 %, ce qui est semblable à celui obtenu avec l’accumulation par pompage. En termes de potentiel d’émission de gaz à effet de serre et de dommages aux écosystèmes, la compatibilité environnementale des réservoirs d’air comprimé est également comparable à celle des systèmes à accumulation par pompage. Les réservoirs d’air comprimé sont techniquement réalisables. Les composants importants, comme les turbomachines et les accumulateurs thermiques, sont déjà disponibles sur le marché ou ont été testés dans une installation pilote. La construction de cavités bénéficie de l’expérience acquise lors de la réalisation de tunnels et de cavernes. Les réservoirs adiabatiques d’air comprimé constituent par conséquent une solution de stockage efficace, écologique et techniquement réalisable. En raison de leurs coûts d’investissement élevés et du manque de clarté qui entoure leur cadre économique et juridique, leur rentabilité demeure toutefois incertaine. Cela complique également le financement d’une installation de démonstration.
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Haselbacher, Andreas, Michel Arnal, Maurizio Barbato, et al. Synthèse conjointe «Stockage d’électricité par compression adiabatique d’air» du PNR «Energie». Swiss National Science Foundation (SNSF), 2020. http://dx.doi.org/10.46446/publication_pnr70_pnr71.2020.3.fr.

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La fermeture des centrales nucléaires et le développement de l’énergie solaire et éolienne rendent la production d’électricité plus volatile. De nouveaux systèmes de stockage sont nécessaires pour s’assurer que l’électricité est disponible au moment où elle est nécessaire. Le stockage adiabatique d’air comprimé représente une technologie prometteuse. Il utilise l’excédent de production des installations solaires et éoliennes pour comprimer l’air ambiant et le stocker dans une cavité souterraine. Au besoin, l’air comprimé est à nouveau détendu et entraîne alors une turbine qui produit de l’électricité. En tirant profit de la chaleur générée lors de la compression, cette technologie atteint un rendement de 65 à 75 %, ce qui est semblable à celui obtenu avec l’accumulation par pompage. En termes de potentiel d’émission de gaz à effet de serre et de dommages aux écosystèmes, la compatibilité environnementale des réservoirs d’air comprimé est également comparable à celle des systèmes à accumulation par pompage. Les réservoirs d’air comprimé sont techniquement réalisables. Les composants importants, comme les turbomachines et les accumulateurs thermiques, sont déjà disponibles sur le marché ou ont été testés dans une installation pilote. La construction de cavités bénéficie de l’expérience acquise lors de la réalisation de tunnels et de cavernes. Les réservoirs adiabatiques d’air comprimé constituent par conséquent une solution de stockage efficace, écologique et techniquement réalisable. En raison de leurs coûts d’investissement élevés et du manque de clarté qui entoure leur cadre économique et juridique, leur rentabilité demeure toutefois incertaine. Cela complique également le financement d’une installation de démonstration.
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