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Journal articles on the topic 'Turbomachines Turbomachines Turbine pumps'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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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

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2

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 a

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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

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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 para

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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 comme

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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 o

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7

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 approa

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8

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

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9

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.

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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 eva

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Amirante, R., F. De Bellis, E. Distaso, and P. Tamburrano. "An Explicit, Non-Iterative, Single Equation Formulation for an Accurate One Dimensional Estimation of Vaneless Radial Diffusers in Turbomachines." Journal of Mechanics 31, no. 2 (2014): 113–22. http://dx.doi.org/10.1017/jmech.2014.72.

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AbstractThe present paper proposes a very simple one dimensional (1-D) model that accounts for the energy loss caused by the fluid dynamic losses occurring in the vaneless diffusers of centrifugal compressors and pumps. Usually, the present techniques to design turbomachines (pumps, compressors and turbines) emphasize numerical methods and their use is relatively complex because several parameters need to be chosen and a lot of time is required to perform the calculation. For this reason, it is relevant to perform an accurate preliminary design to simplify the numerical computation phase and t

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Zemanová, Lucie, and Pavel Rudolf. "Turbulence Models for Simulation of the Flow in a Rotor-Stator Cavity." EPJ Web of Conferences 213 (2019): 02104. http://dx.doi.org/10.1051/epjconf/201921302104.

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Modelling of the flow in the cavities between rotor and stator in turbomachines (e.g. pumps or turbines) is a task of great interest. Correctly evaluated pressure and velocity fields enable calculation of the disk losses and therefore assessment of efficiency. It is also crucial for determination of axial thrust and thus design of the bearings. The study demonstrates abilities of various turbulence models to describe the flow in a narrow gap between rotating and stationary disks. Numerical simulations were performed in order to find out the ability of particular models to capture unstable stru

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13

Song, J. W., A. Engeda, and M. K. Chung. "A modified theory for the flow mechanism in a regenerative flow pump." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 217, no. 3 (2003): 311–21. http://dx.doi.org/10.1243/095765003322066538.

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The regenerative flow pump (RFP) and regenerative flow compressor (RFC) are turbomachines capable of developing high pressure ratios in a single stage. They are also known by other names, such as peripheral, side channel, turbine, traction and vortex compressor/pump. Even though the efficiency of RFP/RFC is usually less than 50 per cent based on past design experience, they have found wide applications in automotive and aerospace fuel pumping, booster systems, water supply, agricultural industries, shipping and mining, chemical and food stuffs industries, and regulation of lubrication and filt

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Simão, Mariana, Modesto Pérez-Sánchez, Armando Carravetta, and Helena Ramos. "Flow Conditions for PATs Operating in Parallel: Experimental and Numerical Analyses." Energies 12, no. 5 (2019): 901. http://dx.doi.org/10.3390/en12050901.

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Micro-hydro systems can be used as a promising new source of renewable energy generation, requiring a low investment cost of hydraulic, mechanical, and electrical equipment. The improvement of the water management associated with the use of pumps working as turbines (PATs) is a real advantage when the availability of these machines is considered for a wide range of flow rates and heads. Parallel turbomachines can be used to optimize the flow management of the system. In the present study, experimental tests were performed in two equal PATs working in parallel and in single mode. These results

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Rakibuzzaman, Md, Keum-Young Jung, and Sang-Ho Suh. "A study on the use of existing pump as turbine." E3S Web of Conferences 128 (2019): 06004. http://dx.doi.org/10.1051/e3sconf/201912806004.

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Cavitation is an abnormal physical phenomenon which occurs in relatively low–pressure regions in turbomachinery such as pumps and hydraulic turbines. A comparison between the pump and turbine cavitation behavior is a significant and essential process. The work investigates feasibility of turbineusing existing pump and a comparative study of the cavitation characteristics on a centrifugal pump asturbine numerically and experimentally. The current work adopted the Rayleigh–Plesset cavitation model as the source term for inter–phase mass transfer to predict cavitation characteristics.The experime

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16

Visser, F. C., J. J. H. Brouwers, and R. Badie. "Theoretical analysis of inertially irrotational and solenoidal flow in two-dimensional radial-flow pump and turbine impellers with equiangular blades." Journal of Fluid Mechanics 269 (June 25, 1994): 107–41. http://dx.doi.org/10.1017/s0022112094001503.

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Using the theory of functions of a complex variable, in particular the method of conformal mapping, the irrotational and solenoidal flow in two-dimensional radialflow pump and turbine impellers fitted with equiangular blades is analysed. Exact solutions are given for the fluid velocity along straight radial pump and turbine impeller blades, while for logarithmic spiral pump impeller blades solutions are given which hold asymptotically as (r1/r2)n→0, in whichr1is impeller inner radius,r2is impeller outer radius andnis the number of blades. Both solutions are given in terms of a Fourier series,

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17

Kosoy, A. S., S. V. Monin, and M. V. Sinkevich. "Contemporary approaches to research supporting the development of microturbine power generation systems." Journal of «Almaz – Antey» Air and Space Defence Corporation, no. 1 (March 30, 2018): 72–79. http://dx.doi.org/10.38013/2542-0542-2018-1-72-79.

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The paper provides an analysis of how much it is possible to improve the efficiency of low-power gas-turbine engines. We show that refining those features of the main blading section units that affect the gas dynamics significantly enhances engine performance. We present a new concept of developing highly efficient turbomachinery, pumps and propellers using modern additive manufacturing technology. We describe a unique research and testing facility for studies, per-node refinement and testing concerning gas-turbine engine components, which should ensure low cost and high efficiency of gas-turb

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18

Tiainen, Jonna, Ahti Jaatinen-Värri, Aki Grönman, Petri Sallinen, Juha Honkatukia, and Toni Hartikainen. "Validation of the Axial Thrust Estimation Method for Radial Turbomachines." International Journal of Rotating Machinery 2021 (February 24, 2021): 1–18. http://dx.doi.org/10.1155/2021/6669193.

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The fast preliminary design and safe operation of turbomachines require a simple and accurate prediction of axial thrust. An underestimation of these forces may result in undersized bearings that can easily overload and suffer damage. While large safety margins are used in bearing design to avoid overloading, this leads to costly oversizing. In this study, the accuracy of currently available axial thrust estimation methods is analyzed by comparing them to each other and to theoretical pressure distribution, numerical simulations, and new experimental data. Available methods tend to underestima

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Иванов, Андрей, and Andrey Ivanov. "INFLUENCE OF GAP FORM IN NON-CONTACT SEAL OF HIGH-SPEED TURBOMACHINE UPON ITS PARAMETERS." Bulletin of Bryansk state technical university 2016, no. 4 (2016): 39–45. http://dx.doi.org/10.12737/23161.

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Consolidation is one of the most significant elements in any turbomachine defining both economy and capacity for work of a unit. In high-speed pumps and turbines which belong turbo-pump units (TPU) of liquid-propellant engines (LPE) to, one uses mainly non-contact seals and in the first place groove seals. A radial seal gap its value and a form is a basic factor defining parameters and characteristics of sealing. In the paper there is shown the influence of geometrical characteristics of a non-contact seal gap in a high-speed turbomachine upon its characteristics. The influ-ence of the form of

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20

Najjar, Yousef S. H. "Review of Aerothermally Induced Vibrations in Gas Turbine Engines." Energy & Environment 6, no. 2 (1995): 143–57. http://dx.doi.org/10.1177/0958305x9500600205.

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High or changing vibration amplitude patterns in turbomachines are signs of impending failure or a machines deterioration. If properly diagnosed, this information can help improve performance, reliability; reduce maintenance cost; and avoid serious outages. Vibrations could be caused by structural or aerodynamic excitations, in addition to combustion pulsations. Methods of decreasing vibrations are mentioned, where selection of proper materials plays an important role. These areas are reviewed briefly in this work.

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Lazarovski, Nikolay, Paskal Novakov, and Anastas Yangyozov. "Mass Transfer Modeling into Disk Spaces of Heat Turbomachines." Defect and Diffusion Forum 362 (April 2015): 1–12. http://dx.doi.org/10.4028/www.scientific.net/ddf.362.1.

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The thermal aerodynamic analysis of the processes in thermal turbomachinery is of great importance when it comes their design and operation in order to achieve reliable and trouble-free operation in the required turbo-power range. The distribution of kinematic and thermodynamic parameters of the working medium around heavy loaded working disks and labyrinth seals has a significant influence on heat-mass exchange and energy transformation processes. Object of this work is thermo-aerodynamic research of mass exchange processes associated with the movement of the working medium in typical complex

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22

Denton, J. D. "The Calculation of Three-Dimensional Viscous Flow Through Multistage Turbomachines." Journal of Turbomachinery 114, no. 1 (1992): 18–26. http://dx.doi.org/10.1115/1.2927983.

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The extension of a well-established three-dimensional flow calculation method to calculate the flow through multiple turbomachinery blade rows is described in this paper. To avoid calculating the unsteady flow, which is inherent in any machine containing both rotating and stationary blade rows, a mixing process is modeled at a calculating station between adjacent blade rows. The effects of this mixing on the flow within the blade rows may be minimized by using extrapolated boundary conditions at the mixing plane. Inviscid calculations are not realistic for multistage machines and so the method

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Damle, S. V., T. Q. Dang, and D. R. Reddy. "Throughflow Method for Turbomachines Applicable for All Flow Regimes." Journal of Turbomachinery 119, no. 2 (1997): 256–62. http://dx.doi.org/10.1115/1.2841108.

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A new axisymmetric throughflow method for analyzing and designing turbomachines is proposed. This method utilizes body-force terms to represent blade forces and viscous losses. The resulting equations of motion, which include these body-force terms, are cast in terms of conservative variables and are solved using a finite-volume time-stepping scheme. In the inverse mode, the swirl schedule in the bladed regions (i.e., the radius times the tangential velocity rVθ) is the primary specified flow quantity, and the corresponding blade shape is sought after. In the analysis mode, the blade geometry

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Asuaje, M., F. Bakir, S. Kouidri, R. Noguera, and R. Rey. "Computer-aided design and optimization of centrifugal pumps." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 219, no. 3 (2005): 187–93. http://dx.doi.org/10.1243/095765005x7556.

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Improvement in computer power and the development of numerical computational methods over the last few years have allowed the emergence of computational fluid dynamic (CFD) codes, making possible the numerical simulation of flow and energy transfer in turbomachines. To improve the efficiency of these tools, fast design software must be used. Within the framework of the optimization process of centrifugal pumps, HELIOX software was developed. It is a tool for design and performance analysis of centrifugal pumps. HELIOX allows quick design of new pumps and improvement of existing ones. HELIOX's

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Siddique, M. Hamid, Arshad Afzal, and Abdus Samad. "Design Optimization of the Centrifugal Pumps via Low Fidelity Models." Mathematical Problems in Engineering 2018 (June 21, 2018): 1–14. http://dx.doi.org/10.1155/2018/3987594.

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Low fidelity model assisted design optimization of turbomachines has reduced the total computational and experimental costs. These models are called surrogate models which mimic the actual experiments or simulations. The surrogate models can generate thousands of approximate results from a few samples, making it easy to locate the optimal solution. Ample articles reported surrogate assisted design optimization of centrifugal pumps. In this article, the authors try to give a brief overview of the surrogate based optimization technique along with its historical applications and trend of the rece

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Sharma, Chirag, Siddhant Kumar, Aanya Singh, et al. "Comprehensive Review on Leading Edge Turbine Blade Cooling Technologies." International Journal of Heat and Technology 39, no. 2 (2021): 403–16. http://dx.doi.org/10.18280/ijht.390209.

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Developments in the gas turbine technology have caused widespread usage of the Turbomachines for power generation. With increase in the power demand and a drop in the availability of fuel, usage of turbines with higher efficiencies has become imperative. This is only possible with an increase in the turbine inlet temperature (TIT) of the gas. However, the higher limit of TIT is governed by the metallurgical boundary conditions set by the material used to manufacture the turbine blades. Hence, turbine blade cooling helps in drastically controlling the blade temperature of the turbine and allows

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Acosta, Allan J., Yoshinobu Tsujimoto, Yoshiki Yoshida, Seiji Azuma, and Paul Cooper. "Effects of Leading Edge Sweep on the Cavitating Characteristics of Inducer Pumps." International Journal of Rotating Machinery 7, no. 6 (2001): 397–404. http://dx.doi.org/10.1155/s1023621x01000343.

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It is well known that leading edge sweep has a favorable effect on the cavitation of turbomachines. However, the mechanisms of the improvement have not been made clear. It has been shown that the lift and the drag on a cavitating swept single hydrofoil can be correlated fairly well based on the velocity component normal to the leading edge. In the present paper, such correlations for swept cascades are derived and the results are examined, neglecting the full geometrical effects of the inducer rotor. It is shown that the correlations can simulate the developments of various types of cavitation

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Wang, Zhengming. "A Method for Aerodynamic Design of Blades in Quasi-Three-Dimensional Calculation of Turbomachines." Journal of Turbomachinery 110, no. 2 (1988): 181–86. http://dx.doi.org/10.1115/1.3262178.

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A special inverse problem is formulated in which the shape of the mean streamline and the circumferential thickness distribution of the profile are given. On the basis of the series expansion method on a selected streamline, in quasi-three-dimensional aerodynamic design, the blade profile thickness is automatically fulfilled by computer. Six radial sections of a turbine blade are designed by this method.

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29

Barmpalias, Konstantinos G., Ndaona Chokani, Anestis I. Kalfas, and Reza S. Abhari. "Data Adaptive Spectral Analysis of Unsteady Leakage Flow in an Axial Turbine." International Journal of Rotating Machinery 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/121695.

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A data adaptive spectral analysis method is applied to characterize the unsteady loss generation in the leakage flow of an axial turbine. Unlike conventional spectral analysis, this method adapts a model dataset to the actual data. The method is illustrated from the analysis of the unsteady wall pressures in the labyrinth seal of an axial turbine. Spectra from the method are shown to be in good agreement with conventional spectral estimates. Furthermore, the spectra using the method are obtained with data records that are 16 times shorter than for conventional spectral analysis, indicating tha

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Walker, P. J., and W. N. Dawes. "The Extension and Application of Three-Dimensional Time-Marching Analyses to Incompressible Turbomachinery Flows." Journal of Turbomachinery 112, no. 3 (1990): 385–90. http://dx.doi.org/10.1115/1.2927671.

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Conventional time-marching flow solvers perform poorly when integrating compressible flow equations at low Mach number levels. This is shown to be due to unfavorable interaction between long-wavelength errors and the inflow and outflow boundaries. Chorin’s method of artificial compressibility is adopted to extend the range of Denton’s inviscid flow solver and Dawes’ three-dimensional Navier–Stokes solver to zero Mach number flows. The paper makes a new contribution by showing how to choose the artificial acoustic speed systematically to optimize convergence rate with regard to the error wave–b

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Guinzburg, A., C. E. Brennen, A. J. Acosta, and T. K. Caughey. "Experimental Results for the Rotordynamic Characteristics of Leakage Flows in Centrifugal Pumps." Journal of Fluids Engineering 116, no. 1 (1994): 110–15. http://dx.doi.org/10.1115/1.2910217.

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In recent years, increasing attention has been given to fluid-structure interaction problems in turbomachines. The present research focuses on just one such fluid-structure interaction problem, namely, the role played by fluid forces in determining the rotordynamic stability and characteristics of a centrifugal pump. The emphasis of this study is to investigate the contributions to the rotordynamic forces from the discharge-to-suction leakage flows between the front shroud of the rotating impeller and the stationary pump casing. An experiment was designed to measure the rotordynamic shroud for

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Lee, Donghyun, Byungock Kim, Mooryong Park, Hyungsoo Lim, and Euisoo Yoon. "Development of Pump-Drive Turbine Module with Hydrostatic Bearing for Supercritical CO2 Power Cycle Application." Applied Sciences 10, no. 19 (2020): 6824. http://dx.doi.org/10.3390/app10196824.

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The turbomachinery used in the sCO2 power cycle requires a high stable rotor-bearing system because they are usually designed to operate in extremely high-pressure and temperature conditions. In this paper, we present a pump-drive turbine module applying hydrostatic bearing using liquid CO2 as the lubricant for a 250 kW supercritical CO2 power cycle. This design is quite favorable because stable operation is possible due to the high stiffness and damping of the hydrostatic bearing, and the oil purity system is not necessary when using liquid CO2 as the lubricant. The pump-drive turbine module

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Presas, Alexandre, David Valentin, Carme Valero, Monica Egusquiza, and Eduard Egusquiza. "Experimental Measurements of the Natural Frequencies and Mode Shapes of Rotating Disk-Blades-Disk Assemblies from the Stationary Frame." Applied Sciences 9, no. 18 (2019): 3864. http://dx.doi.org/10.3390/app9183864.

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Determining the natural frequencies and mode shapes of rotating turbomachinery components from both rotating and stationary reference frames is of paramount importance to avoid resonance problems that could affect the normal operation of the machine, or even cause critical damages in these components. Due to their similarity to real engineering cases, this topic has been experimentally analyzed in the past for disk-shaft assemblies and rotor disk-blades assemblies (bladed-disk or blisk). The same topic is less analyzed for disk-blades-disk assemblies, although such configurations are widely us

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Kyparissis, Spyridon D., and Dionissios P. Margaris. "Experimental Investigation and Passive Flow Control of a Cavitating Centrifugal Pump." International Journal of Rotating Machinery 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/248082.

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Passive flow control techniques are used to improve the flow field and efficiency of centrifugal pumps and turbomachines, in general. An important phenomenon that mechanical engineers have to take into account is cavitation. It leads to the decrease of the pump performance and total head. In the present experimental study, a centrifugal pump is investigated in cavitating conditions. A passive flow control is realized using three different blade leading edge angles in order to reduce the cavitation development and enhance the pump performance. The experiments are carried out in a pump test rig

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Zemanová, Lucie, and Pavel Rudolf. "Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review." Energies 13, no. 24 (2020): 6617. http://dx.doi.org/10.3390/en13246617.

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The paper critically reviews the current state of the art in flow inside sidewall gaps of hydraulic pumps and turbines. It describes the consequences of the presence of this type of flow in turbomachinery and then relates it to other physical phenomena that determine the behavior, operating characteristics, and overall performance of the machine. Despite the small dimensions of the rotor-stator spaces, the flow in these regions can significantly affect the overall flow field and, consequently, efficiency. The circulation of the fluid inside the gaps and secondary flow that is caused by rotatin

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Mobarak, A., M. G. Khalafallah, A. M. Osman, and H. A. Heikal. "Experimental Investigation of Secondary Flow and Mixing Downstream of Straight Turbine Cascades." Journal of Turbomachinery 110, no. 4 (1988): 497–503. http://dx.doi.org/10.1115/1.3262223.

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The purpose of this paper is to investigate the flow field downstream of turbine cascades of low aspect ratio, often used in vehicles and small turbomachines. Experimental investigation was carried out to study the flow downstream of three sets of turbine cascades having the same blade turning angle of about 83 deg but different profiles. The total energy losses were measured at several planes downstream of the cascade of blades in order to determine the changes in gross secondary flow loss coefficient and the growth of the mixing loss with distance downstream. Influence of inlet boundary laye

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Capata, Roberto. "New Power Train Concept for a City Hybrid Vehicle." Proceedings 58, no. 1 (2020): 6. http://dx.doi.org/10.3390/wef-06926.

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This research aims to test the feasibility of a prototype of a newly designed thermal engine for a hybrid propulsion vehicle. This study consists of the implementation of an innovative supercharger for city car ICE (900cc). The preliminary proposal presented here is to mechanically disconnect the compressor/turbine device, supporting the rotation of the compressor with a dedicated electric motor and connecting a turbine to a generator. Mechanical decoupling will allow both machines to be designed for operating closer to their maximum performance point, for most of the expected real field of op

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Najjar, Yousef S. H. "Relative effect of pressure losses and inefficiencies of turbomachines on the performance of the heat-exchange gas turbine cycle." Applied Thermal Engineering 16, no. 8-9 (1996): 769–76. http://dx.doi.org/10.1016/1359-4311(95)00031-3.

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Capata, Roberto. "Preliminary Analysis of a New Power Train Concept for a City Hybrid Vehicle." Designs 5, no. 1 (2021): 19. http://dx.doi.org/10.3390/designs5010019.

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This research aims to test the feasibility of a prototype of a newly designed thermal engine for a hybrid propulsion vehicle. This study consists of the implementation of an innovative supercharger for city car internal combustion engine ICE (900 cc). The preliminary proposal presented here is to mechanically disconnect the compressor/turbine device, supporting the rotation of the compressor with a dedicated electric motor and connecting a turbine to a generator. Mechanical decoupling will allow both machines to be designed for operating closer to their maximum performance point, for most of t

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Ng, E. Y. K., and Miao Yi. "Computation of Q3D Viscous Flows in Various Annular Turbine Stages with Heat Transfer." International Journal of Rotating Machinery 4, no. 1 (1998): 25–33. http://dx.doi.org/10.1155/s1023621x98000037.

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A better understanding of the flow inside the multi-stage turbomachines will be very useful to both the designer and operator. The numerical calculation for single blade row has been well established with the time marching computation of the Navier-Stokes equations. But there will exist much more difficulties for the multi-blade rows due to the rotor-stator interaction. The major problems are related to the unsteady flow which will inevitably exist in the blade passages due to the different rotating speed and possible the different in blade number. A method is presented for simulating various

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Matsunuma, Takayuki, and Takehiko Segawa. "Effects of Input Voltage and Freestream Velocity on Active Flow Control of Passage Vortex in a Linear Turbine Cascade Using Dielectric Barrier Discharge Plasma Actuator." Energies 13, no. 3 (2020): 764. http://dx.doi.org/10.3390/en13030764.

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Passage vortex exists as one of the typical secondary flows in turbomachines and generates a significant total pressure loss and degrades the aerodynamic performance. Herein, a dielectric barrier discharge (DBD) plasma actuator was utilized for an active flow control of the passage vortex in a linear turbine cascade. The plasma actuator was installed on the endwall, 10 mm upstream from the leading edge of the turbine cascade. The freestream velocity at the outlet of the linear turbine cascade was set to range from UFS,out = 2.4 m/s to 25.2 m/s, which corresponded to the Reynolds number ranging

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Borges, J. E. "A Three-Dimensional Inverse Method for Turbomachinery: Part II—Experimental Verification." Journal of Turbomachinery 112, no. 3 (1990): 355–61. http://dx.doi.org/10.1115/1.2927667.

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The performance of an impeller of a low-speed radial-inflow turbine, designed using a three-dimensional inverse technique, was evaluated experimentally. This performance was compared with that achieved by a rotor typical of the present technology. Besides measuring overall quantities, in special efficiency, some traverses of flow velocity were carried out. The results of the tests showed that the new design had a peak total-to-static efficiency 1.4 points better than the conventional build. The traverses indicated that the level of swirl at exhaust of the new impeller was only half as big as t

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Ismail, Mohd Azlan, Al Khalid Othman, and Hushairi Zen. "Numerical Investigation of Rotational Speed on Pump as Turbine for Microhydro Applications." Applied Mechanics and Materials 833 (April 2016): 11–18. http://dx.doi.org/10.4028/www.scientific.net/amm.833.11.

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Pump as Turbine (PAT) always has been a favourable solution to generate electricity in rural areas when there is a potential microhydro site. Such systems have lower capital cost, and they are easier to maintain than commercially-available microhydro turbines. Normally, PAT is designed to run at a rated rotational speed so it can directly couple with an induction generator in order to match the synchronous speed. In an actual scenario, the PAT’s rotational speed changes and fluctuates with respect to flow rate due to the absence of a hydraulic control mechanism. It is essential to understand h

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Marin, G. E., B. M. Osipov, and A. R. Akhmetshin. "Technical and economic assessment of the parameters of thermal schemes of thermal power plants with a hydrogen generator." Power engineering: research, equipment, technology 23, no. 2 (2021): 84–92. http://dx.doi.org/10.30724/1998-9903-2021-23-2-84-92.

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THE PURPOSE. The study is aimed at studying the effect of fuel gases of various component composition on the environmental performance of the GE 6FA gas turbine unit. Consider using hydrogen as primary sweat to minimize emissions and improve performance of the GE 6FA gas turbine. METHODS. To achieve this goal, the ASGRET (Automated system for gas-dynamic calculations of power turbomachines) software package was used. RESULTS. The article discusses promising directions for the utilization of CO2 using highly efficient technologies with further use or disposal. A mathematical model of a GE 6FA g

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Leguizamón, Sebastián, and François Avellan. "Open-Source Implementation and Validation of a 3D Inverse Design Method for Francis Turbine Runners." Energies 13, no. 8 (2020): 2020. http://dx.doi.org/10.3390/en13082020.

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The hydraulic design of Francis turbines and pump-turbines is an expensive project-specific engineering effort that typically involves a direct iterative exploration of the design space. An inverse design method for turbomachinery has been previously introduced in the literature, and several recent applications have demonstrated its advantages; however, only a commercial implementation of the method is currently available. In this work, an open-source implementation of the inverse design method is introduced. First, the governing equations in cylindrical and curvilinear coordinate systems are

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Shao, Ziyi, Wen Li, Yangli Zhu, et al. "Tip leakage flow analysis of an axial turbine under the effect of separation at low Reynolds number." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 6 (2019): 751–65. http://dx.doi.org/10.1177/0957650919882877.

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The tip clearance flow could lead to work reduction and loss generation in turbomachines. However, the effect of separation at low Reynolds number on leakage flow is seldom studied. The previous method for evaluating tip leakage characteristics should also be further researched. Thus, numerical investigations on the tip clearance flow in an unshrouded axial-inflow turbine are conducted at low Reynolds number (3.5 × 104 of the rotor outlet at the designed condition) in the present study. The flow patterns and leakage mass flow rate of the clearance have been analyzed in detail. It is found that

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Chasoglou, Alexandros C., Michel Mansour, Anestis I. Kalfas, and Reza S. Abhari. "A novel 4-sensor fast-response aerodynamic probe for non-isotropic turbulence measurement in turbomachinery flows." Journal of the Global Power and Propulsion Society 2 (May 17, 2018): UALS07. http://dx.doi.org/10.22261/jgpps.uals07.

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Abstract In modern computational studies for turbomachinery applications, time, length scales and isotropy of turbulent structures are important for representative modelling. To this end, experimental data are essential to validate the numerical tools. The current article presents the development and application of a newly designed 4-sensor Fast Response Aerodynamic Probe (FRAP-4S) enabling time-resolved measurement of the three-dimensional unsteady flow velocity vector in turbomachines. The miniature multi-sensor probe demonstrates a 4 mm probe-tip. In the first part of this article the desig

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Kupferschmied, Peter, Pascal Ko¨ppel, Christian Roduner, and Georg Gyarmathy. "On the Development and Application of the Fast-Response Aerodynamic Probe System in Turbomachines—Part 1: The Measurement System." Journal of Turbomachinery 122, no. 3 (1999): 505–16. http://dx.doi.org/10.1115/1.1303702.

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This contribution gives an overview of the current state, performance, and limitations of the fast-response aerodynamic probe measurement system developed at the Turbomachinery Lab of the ETH Zurich. In particular, the following topics are addressed: • Probe technology: Miniature probes with tip diameter ranging from 0.84 to 1.80 mm (one-sensor and three-sensor probes, respectively) have been developed. New technologies derived from microelectronics and micromechanics have been used to achieve an adequate packaging of the microsensor chips used. Both the sensor packaging and the sensor calibra

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Carscallen, W. E., T. C. Currie, S. I. Hogg, and J. P. Gostelow. "Measurement and Computation of Energy Separation in the Vortical Wake Flow of a Turbine Nozzle Cascade." Journal of Turbomachinery 121, no. 4 (1999): 703–8. http://dx.doi.org/10.1115/1.2836723.

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This paper describes the observation, measurement, and computation of vortex shedding behind a cascade of turbine nozzle guide vanes that have a blunt trailing edge. At subsonic discharge speeds, periodic wake vortex shedding was observed at all times at a shedding frequency in the range 7–11 kHz. At high subsonic speeds the wake was susceptible to strong energy redistribution. The effect was greatest around an exit Mach number of 0.95 and results are presented for that condition. An unusually cold flow on the wake centerline and hot spots at the edges of the wake were measured. These were fou

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van de Wall, Allan G., Jaikrishnan R. Kadambi, and John J. Adamczyk. "A Transport Model for the Deterministic Stresses Associated With Turbomachinery Blade Row Interactions." Journal of Turbomachinery 122, no. 4 (2000): 593–603. http://dx.doi.org/10.1115/1.1312802.

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The unsteady process resulting from the interaction of upstream vortical structures with a downstream blade row in turbomachines can have a significant impact on the machine efficiency. The upstream vortical structures or disturbances are transported by the mean flow of the downstream blade row, redistributing the time-average unsteady kinetic energy (K) associated with the incoming disturbance. A transport model was developed to take this process into account in the computation of time-averaged multistage turbomachinery flows. The model was applied to compressor and turbine geometry. For comp

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