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Journal articles on the topic 'Turbine pump'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Williams, A. A. "The Turbine Performance of Centrifugal Pumps: A Comparison of Prediction Methods." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 208, no. 1 (1994): 59–66. http://dx.doi.org/10.1243/pime_proc_1994_208_009_02.

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Standard centrifugal Dumps may be operated in reverse as water turbines, and for hydroelectric plums of less than 100 kW (micro- hydro) they are often cheaper than specifically designed turbines. However, in order to use a pump in a micro-hydro scheme, the turbine performance-must be found either by testing or by calculation. Several methods have been suggested for predicting the turbine performance based on the data for pump performance at best efficiency, but they produce a wide range of results. In this paper, eight such methods are compared using an analysis of the effects of poor turbine

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2

Muljadi, E., L. Flowers, J. Green, and M. Bergey. "Electric Design of Wind-Electric Water Pumping Systems." Journal of Solar Energy Engineering 118, no. 4 (1996): 246–52. http://dx.doi.org/10.1115/1.2871786.

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Wind turbine technology has been used to pump water since ancient history. Direct mechanically coupled wind turbines are the most common method for pumping water to croplands and livestock. Many more recent wind turbines are electrically coupled, with the water pump connected to the wind turbine via a motor-generator connection. With electrical coupling, the distance and location of the water pump is independent of the location of the wind turbine. Therefore, the wind turbine can be located at an optimal wind energy site while the water pump is close to the water well or water tank. This paper

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3

Guo, Peng-Cheng, Hao Zhang, and Long-Gang Sun. "Transient dynamic analysis of a pump-turbine with hysteresis effect." Modern Physics Letters B 34, no. 12 (2020): 2050125. http://dx.doi.org/10.1142/s0217984920501250.

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Hysteresis effect, which has a significant impact on transient characteristics of a pump-turbine, attracts more and more researchers’ attention and shows great potential. Influences of hysteresis on dynamic characteristics of a pump-turbine are investigated during the transient process in this paper. Transient trajectories of pump-turbines actually do not match their static operation trajectories, especially in the condition of turbine braking. In order to establish a transient model of a pump-turbine in different moving directions of dynamic trajectories, time delays among the relative parame

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4

Bogdanovic, Bozidar. "The development of turbine-pump aggregate." Thermal Science 10, no. 4 (2006): 163–76. http://dx.doi.org/10.2298/tsci0604163b.

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With increasing needs for energy, renewable energy sources have been nowadays the one of the main subject of interest all around the world. Therefore, we made an effort to develop a gamma of axial micro turbines, for a purpose of generation of electrical energy on small water derivation, as well as a part of an irrigation turbine-pump aggregate. In this paper are presented constructive solution of a turbine-pump aggregate with micro turbine and standard norm centrifugal pump. Based on project calculation, expected operating parameters are obtained. After defining conceptual solution of the agg

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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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6

Asomani, Stephen Ntiri, Jianping Yuan, Longyan Wang, Desmond Appiah, and Fan Zhang. "Geometrical effects on performance and inner flow characteristics of a pump-as-turbine: A review." Advances in Mechanical Engineering 12, no. 4 (2020): 168781402091214. http://dx.doi.org/10.1177/1687814020912149.

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A pump-as-turbine is a hydraulic machine that can operate as a pump and turbine at the same time. Pump-as-turbine happens to be the most appropriate method for meeting the world’s energy demands, particularly in rural and isolated areas of a country. Furthermore, the operating cost of microhydropower systems is lower compared to conventional hydrodynamic turbines, but it requires high initial investment. Pump-as-turbine has been applied in many engineering fields such as irrigation, sewage, reverse osmosis, water distribution systems, farms, small pump storage power house, and pressure droppin

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Stefanizzi, Michele, Tommaso Capurso, Marco Torresi, et al. "Development of a 1-D Performance Prediction Model for Pumps as Turbines." Proceedings 2, no. 11 (2018): 682. http://dx.doi.org/10.3390/proceedings2110682.

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Pumps as turbines (PaTs) are becoming more and more attractive in Small Hydropower. PaTs are considered a cost-effective alternative to conventional turbines as long as their turbine characteristic curves can be predicted. Indeed, manufacturers need of a tool that could support them to predict the turbine mode performance from the knowledge of pump characteristics, in order to be competitive on the market. In this framework, a new 1-D prediction model is proposed for manufacturers in order to predict the entire characteristic of a PaT, by taking into account detailed geometrical information of

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Bogdanovic-Jovanovic, Jasmina, Dragica Milenkovic, Dragan Svrkota, Bozidar Bogdanovic, and Zivan Spasic. "Pumps used as turbines power recovery, energy efficiency, CFD analysis." Thermal Science 18, no. 3 (2014): 1029–40. http://dx.doi.org/10.2298/tsci1403029b.

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As the global demand for energy grows, numerous studies in the field of energy efficiency are stimulated, and one of them is certainly the use of pumps in turbine operating mode. In order to reduce time necessary to determine pump characteristic in turbine operating mode problem was studied by computational fluid dynamics approach. The paper describes various problems faced during modeling (pump and turbine mode) and the approaches used to resolve the problems. Since in the majority of applications, the turbine is a pump running in reverse, many attempts have been made to predict the turbine p

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9

Zhang, Yuning, Yuning Zhang, and Yulin Wu. "A review of rotating stall in reversible pump turbine." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 7 (2016): 1181–204. http://dx.doi.org/10.1177/0954406216640579.

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Currently, operations of reversible pump turbines in pumped hydro energy storage plant suffer great instability problems in the well-known S-shaped characteristic regions, leading to the failure of start, significant pressure fluctuations, and severe vibrations of the whole system. One of the physical origins of the above instability of reversible pump turbines is the rotating stall phenomenon generated at off-design conditions in generating mode. In this review, recent studies on the rotating stall of reversible pump turbines are critically reviewed with a focus on the generating mode. In rev

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10

Ismail, Mohd Azlan, Al Khalid Othman, and Hushairi Zen. "An Economic Evaluation of Electromechanical Components for Microhydro in Borneo – Case Study." Asia Pacific Journal of Energy and Environment 2, no. 1 (2015): 17–24. http://dx.doi.org/10.18034/apjee.v2i1.220.

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This paper presents an economic evaluation using Life Cycle Cost Analysis and Rate of Return to compare Pump as Turbine and Multi Jet Pelton Turbine as an electromechanical component in a microhydro project for Kampung Longkongungan, Sabah. The aim of this paper is to support microhydro project managers in rural areas to evaluate economic advantages between two type of turbines, taking into account relevant cost components, covering a wider perspective beyond capital cost. The analysis is set in view of 15 years product lifespan with discount rate set at 5% per annum. The goal of this study is

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11

Innajie, Dewn, Coolen Laure, and Mecandily Gercia. "Hydroelectric Power Plant Design with Hydraulic Pump System." Journal La Multiapp 2, no. 3 (2021): 40–43. http://dx.doi.org/10.37899/journallamultiapp.v2i3.392.

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The goal of this research is to develop a small-capacity power generator that may be used as an alternative energy source for home use, particularly in rural regions. The hydraulic ram pump was included in the design as a critical component for extending the duration of power production by turbines and generators, which was achieved via innovative engineering. During the manufacturing of hydraulic ram pumps, there are three test variants, which are comprised of the intake pipe length (2.6m), the output pipe height (2.5m, 3.2m, and 3.7m), and the outlet pipe diameter (3/4") of each pump. As a c

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12

Shi, Feng Xia, Jun Hu Yang, and Xiao Hui Wang. "Effect of Rotating Speed on Hydraulic Energy Recovery Turbines Performance." Applied Mechanics and Materials 444-445 (October 2013): 1033–37. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.1033.

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In order to forecast the rotating speed of the hydraulic energy recovery turbine, Single centrifugal pump and single centrifugal pump with guide vane in reverse operation were adopted as turbines. 3D models were founded by pro/E software for turbines, Then the models were meshed by gambit and Simulated by fluent6.3 software. It was shown that before the best efficiency points, The higher the rotating speed, the lower the efficiency of turbine . but after the best efficiency points, the efficiency of turbine increased with the rise of rotating speed. with the rise of rotating speed ,the pressur

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13

Hong, Soon-Sam, Dae-Jin Kim, Jin-Sun Kim, and Jinhan Kim. "System performance tests and start transient analysis of a liquid rocket engine turbopump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 3 (2012): 470–80. http://dx.doi.org/10.1177/0954406212464614.

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This article describes a series of development tests of a turbopump, which can be applied to a gas generator cycle rocket engine with liquid oxygen and kerosene propellants. A turbine drives both an oxidizer pump and a fuel pump in the turbopump assembly. In the tests, liquid oxygen and kerosene are supplied to the oxidizer pump and the fuel pump, respectively, while either cold hydrogen gas or hot gas from the gas generator is supplied to the turbine. The turbopump is operated reliably at both on-design and off-design conditions, meeting all the performance requirements. The test results are

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Zhou, J. X., B. W. Karney, M. Hu, and J. C. Xu. "Analytical study on possible self-excited oscillation in S-shaped regions of pump-turbines." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 225, no. 8 (2011): 1132–42. http://dx.doi.org/10.1177/0957650911419442.

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As a renewable energy resource, the pumped storage power station has great prospects for better balancing supply and demand, particularly with further development of intermittent power sources and the growing need for an intelligent electric grid. However, pump-turbines often involve problematic S-shaped regions in their machine characteristics and thus, while pumped storage may solve some problems in the grid, pump-turbine operation and control can lead to other problems including severe self-excited oscillation in the hydro-mechanical system. These operational challenges have been so severe

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15

Wang, Jiongming, Feng Wang, Zhenglong Yu, et al. "Study on the Steam Source Selection of Feed Pump Turbine Based on Energy Matching." Energy and Environment Research 11, no. 1 (2021): 86. http://dx.doi.org/10.5539/eer.v11n1p86.

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The first phase of a power plant has two subcritical 300 MW units, and each boiler feed water pump is equipped with two with 50% capacity steam driven feed pumps and one 50% capacity electric start-up feed pump. The two steam pumps are put into operation during normal operation. After the heat supply transformation in the unit of the first phase of this power plant and based on the calculation and analysis of the heat balance of the unit, it is found that there will be insufficient output of the feed pump due to the insufficient steam source after the flow-through transformation, which will af

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16

Fontanella, Stefania, Oreste Fecarotta, Bruno Molino, Luca Cozzolino, and Renata Della Morte. "A Performance Prediction Model for Pumps as Turbines (PATs)." Water 12, no. 4 (2020): 1175. http://dx.doi.org/10.3390/w12041175.

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In recent years, the interest towards the use of pumps operating as turbines (PATs) for the generation of electrical energy has increased, due to the low cost of implementation and maintenance. The main issue that inhibits a wider use of PATs is the lack of corresponding characteristic curves, because manufacturers usually provide only the pump-mode performance characteristics. In the PAT selection phase, the lack of turbine-mode characteristic curves forces users to expend expensive and time-consuming efforts in laboratory testing. In the technical literature, numerous methods are available f

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17

Capurso, Tommaso, Michele Stefanizzi, Marco Torresi, et al. "How to Improve the Performance Prediction of a Pump as Turbine by Considering the Slip Phenomenon." Proceedings 2, no. 11 (2018): 683. http://dx.doi.org/10.3390/proceedings2110683.

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Nowadays Pumps working as Turbines (PaT) are devices widely used to perform energy recovery in hydraulic grids, thus improving their overall efficiency, and to build small hydropower plants. In this work, a centrifugal pump has been numerically investigated in turbine operating mode by means of the open-source CFD code OpenFOAM with emphasis on the flow field at the runner outlet. Due to the reduced number of blades in a PaT, the mean outlet relative velocity angle differs from the blade angle. In order to account for this phenomenon, the slip factor is introduced. The slip factor is investiga

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18

Bozorgi, A., A. Riasi, and A. Nourbakhsh. "Investigation of Effects of Changing Blade Position and Size Reduction on Performance of Axial Pump Used as Turbine." Applied Mechanics and Materials 110-116 (October 2011): 2933–39. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.2933.

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Small hydropower stations as renewable resources of energy have noticeable potential in the world and with increasing energy demands, using such potentials is a need especially in many developing countries. The major problems of installing the new small hydropower stations are their high specific cost expressed in $/kW installed capacity and maintenance expenses. Part of the solution of these economic problems is to substitute the conventional turbines by simple and inexpensive machines such as reversible pumps. In this present work, an axial pump is simulated in reverse mode by computational

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19

Xue, Liu, Lu, Gao, and Meng. "Experimental Research on the Rotating Stall of a Pump Turbine in Pump Mode." Water 11, no. 11 (2019): 2426. http://dx.doi.org/10.3390/w11112426.

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The rotating stall is an unstable flow phenomenon of pump turbines in pump mode, which is of increasing concern to scientists and engineers working on pump turbines. However, at present, various studies are carried out based on CFD (computational fluid dynamics) simulation, while directly measured data and experimental research on flow fields are seldom reported. By utilizing PIV (particle image velocimetry) measuring equipment, the flow field within the guide vane zone of a low specific speed pump turbine in pump mode was measured. By measuring and analyzing the transient flow field, the evol

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20

Birajdar, Ravindra S., Appasaheb A. Keste, and Shravan H. Gawande. "Critical Hydraulic Eccentricity Estimation in Vertical Turbine Pump Impeller to Control Vibration." International Journal of Rotating Machinery 2021 (July 31, 2021): 1–11. http://dx.doi.org/10.1155/2021/6643282.

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In many applications, pumps are tested against standard specifications to define the maximum allowable vibration amplitude limits of a pump. It is essential to identify the causes of vibration and methods to attenuate the same to ensure the safe and satisfactory operation of a pump. Causes of vibration can be classified mainly into mechanical and hydraulic nature. Respective unbalance masses are the two major factors which cause dynamic effects and excitation forces leading to undesirable vibrations. In this paper, the procedure of vibration magnitude measurement of a vertical turbine pump at

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21

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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22

Liu, Yabin, Lei Tan, and Binbin Wang. "A Review of Tip Clearance in Propeller, Pump and Turbine." Energies 11, no. 9 (2018): 2202. http://dx.doi.org/10.3390/en11092202.

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Propellers, pumps, and turbines are widely applied in marine equipment, water systems, and hydropower stations. With the increasing demand for energy conservation and environmental protection, the high efficiency and the stable operation of pumps and turbine have been drawing great attention in recent decades. However, the tip clearance between the rotating impeller and the stationary shroud can induce leakage flow and interact with the main stream, introducing complex vortex structures. Consequently, the energy performance and the operation stability of pumps and turbines deteriorate consider

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23

Feng, Yee Chang. "A Clean Energy Generation System of In-Tandem Combinations Each of Heat Pump, Compressor and Turbine in Wind Tunnel." Applied Mechanics and Materials 705 (December 2014): 289–94. http://dx.doi.org/10.4028/www.scientific.net/amm.705.289.

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This is a series of in-tandem combinations each of heat pump, air compressor, and air turbine disposed in a wind tunnel, working together to generate clean/renewable electricity. The air compressor, located at downstream of the preceding air turbine, extracts air from this turbine thus reduces its backpressure and causes pressure drop at the turbine exit. Turbine output work Wtb is proportional to temperature difference (T3-T4) of turbine inlet/outlet air, which varies exponentially with turbine outlet/inlet air pressure ratio P4/P3 in adiabatic process as below: Wtb = MCp (T3-T4) = MCpT3{1-P4

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Birajdar, Ravindra, and Appasaheb Keste. "Prediction of flow induced vibrations in vertical turbine pumps using one-way fluid-structure interaction." MATEC Web of Conferences 211 (2018): 16002. http://dx.doi.org/10.1051/matecconf/201821116002.

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Centrifugal pumps/vertical turbine pumps are important and critical equipment for operation in the power generation, water supply, process industries and petrochemical industries. All centrifugal and vertical turbine pumps have rotors and structures that can vibrate in response to excitation forces. Mechanical and hydraulic unbalance are the two major factors which can create dynamic effects in terms of pump vibrations. In many cases the resulting hydraulic forces due to hydraulic unbalance has much the same effect as the mechanical unbalance. The vibrations in the pumps must be within accepta

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Ye, Jiawei, Wei Zeng, Zhigao Zhao, Jiebin Yang, and Jiandong Yang. "Optimization of Pump Turbine Closing Operation to Minimize Water Hammer and Pulsating Pressures During Load Rejection." Energies 13, no. 4 (2020): 1000. http://dx.doi.org/10.3390/en13041000.

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In load rejection transitional processes in pumped-storage plants (PSPs), the process of closing pump turbines, including guide vane (GVCS) and ball valve closing schemes (BVCS), is crucial for controlling pulsating pressures and water hammer. Extreme pressures generated during the load rejection process may result in fatigue damage to turbines, and cracks or even bursts in the penstocks. In this study, the closing schemes for pump turbine guide vanes and ball valves are optimized to minimize water hammer and pulsating pressures. A model is first developed to simulate water hammer pressures an

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Jianguo, Du, Guanghui Chang, Daniel Adu, Ransford Darko, Muhammad A. S. Khan, and Eric O. Antwi. "Numerical Simulation and Computational Flow Characterization Analyses of Centrifugal Pump Operating as Turbine." Complexity 2021 (August 20, 2021): 1–9. http://dx.doi.org/10.1155/2021/9695452.

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Using a pump in reverse mode as a hydraulic turbine remains an alternative for hydropower generation in meeting energy needs, especially for the provision of electricity to remote and rural settlements. The primary challenge with small hydroelectric systems is attributed to the high price of smaller size hydraulic turbines. A specific commercial pump model, with a flow rate of 12.5 m3/h, head 32 m, pressure side diameter of 50 mm, impeller out, and inlet diameters of 160 mm and 6 mm, respectively, was chosen for this research. This research aimed to investigate a pump’s flow characteristics as

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Lunzhang, Shen. "The Chinese water turbine pump." Waterlines 5, no. 3 (1987): 24–26. http://dx.doi.org/10.3362/0262-8104.1987.009.

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NAKAMURA, Takanori, Koutarou TEZUKA, and Yasuyuki ENOMOTO. "Loss Analysis for Pump-Turbine." Proceedings of the JSME annual meeting 2000.4 (2000): 177–78. http://dx.doi.org/10.1299/jsmemecjo.2000.4.0_177.

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Zhao, Zilong, Zhiwei Guo, Zhongdong Qian, and Qian Cheng. "Performance improvement of an axial-flow pump with inlet guide vanes in the turbine mode." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 3 (2019): 323–31. http://dx.doi.org/10.1177/0957650919858842.

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The axial pump operating in the pump-as-turbine mode is a practical and cost-saving alternative suitable for low-head pico hydropower in rural and remote areas that bypasses the need for expensive turbines. Their pump characteristics, however, indicate that efficiency is low in off-design flow rates. Using the computational fluid dynamics, the adjustable inlet guide vanes with five angles (±20°, 0°, ±10°) in front of the impeller of the axial pump have been redesigned and installed specifically to increase the operating range of high efficiency in the pump-as-turbine mode. To validate the simu

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Palikhe, Sunit, Jianxu Zhou, and Khem Prasad Bhattarai. "Hydraulic Oscillation and Instability of a Hydraulic System with Two Different Pump-Turbines in Turbine Operation." Water 11, no. 4 (2019): 692. http://dx.doi.org/10.3390/w11040692.

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Hydraulic oscillation mainly reveals the undesirable pressure fluctuations which can cause catastrophic failure of any hydraulic system. The behavior of a hydraulic system equipped with two different pump-turbines was investigated through hydraulic oscillation analysis to demonstrate severe consequences induced in turbine operation, including S-shaped characteristics. The impedance of a pump-turbine has an essential role in the determination of the instability of the hydraulic system. The conventional way to determine the instability solely using the slope of a characteristic curve was improve

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Kim, Jin-Woo, Jun-Won Suh, Young-Seok Choi, Kyoung-Yong Lee, Toshiaki Kanemoto, and Jin-Hyuk Kim. "Optimized Blade Design of Counter-Rotating-Type Pump-Turbine Unit Operating in Pump and Turbine Modes." International Journal of Rotating Machinery 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/6069780.

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In this study, a counter-rotating-type pump-turbine unit was optimized to improve the pump and turbine mode efficiencies simultaneously. Numerical analysis was carried out by solving three-dimensional Reynolds-averaged Navier–Stokes equations using the shear stress turbulence model. The hub and tip blade angles of the rear impeller (in the pump mode) were selected as the design variables by conducting a sensitivity test. An optimization process based on steady flow analysis was conducted using a radial basis neural network surrogate model with Latin hypercube sampling. The pump and turbine mod

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Balacco, Gabriella, Mario Binetti, Tommaso Capurso, Michele Stefanizzi, Marco Torresi, and Alberto Ferruccio Piccinni. "Pump as Turbine for the Energy Recovery in a Water Distribution Network: Two Italian (Apulian) Case Studies." Environmental Sciences Proceedings 2, no. 1 (2020): 1. http://dx.doi.org/10.3390/environsciproc2020002001.

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This paper expands on the results of the technical and economic feasibility analysis of substituting existing pressure reduction valves (PRVs) with pumps used as turbines (PaTs) in two real Italian water distribution networks (WDN), chosen as case studies, aiming at effective energy recovery. Water demand variability makes complex the selection of the right pump to be used as a turbine in a WDN maximizing its annual electric energy yield. Hence, this study describes an effective approach that permits us to identify the most suitable pumps, starting from the definition of the best efficiency po

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Wang, Xiaohui, Junhu Yang, Zhengting Xia, Yan Hao, and Xiaorui Cheng. "Effect of Velocity Slip on Head Prediction for Centrifugal Pumps as Turbines." Mathematical Problems in Engineering 2019 (March 24, 2019): 1–10. http://dx.doi.org/10.1155/2019/5431047.

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The application of pumps as turbines (PAT) has been developed in several applications for energy recovery schemes. Therefore, establishing a performance correlation between pump mode and turbine mode is essential for selecting the proper machine. However, slip phenomenon is the challenges of head prediction for PAT. In this paper, the slip phenomenon of pump and PAT was revealed, and the slip factor was studied using CFD. The effect of slip on head prediction for PAT was analyzed, and a theoretical prediction model was presented considering slip factors. In order to validate the head predictio

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Ito, M. "Development of high efficiency turbine pump for fuel pump." JSAE Review 16, no. 3 (1995): 327. http://dx.doi.org/10.1016/0389-4304(95)95193-x.

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Cao, Zheng, Jianqiang Deng, Linkun Zhao, and Lin Lu. "Numerical Research of Pump-as-Turbine Performance with Synergy Analysis." Processes 9, no. 6 (2021): 1031. http://dx.doi.org/10.3390/pr9061031.

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The wide use of pumps and turbines has significant value in energy conservation and utilization. In this work, a three-dimensional Computational Fluid Dynamics (CFD) model and a one-dimensional theoretical model of a Pump as Turbine (PAT) were established. On this basis, the correlation between pressure and velocity was quantitatively investigated by a proposed sensitivity index (SPV). A synergy field analysis was then applied to evaluate the flow characteristics of a pump and PAT, providing a perspective from the mechanism of the energy transfer enhancement for hydraulic devices. Moreover, th

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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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Liu, Y. F., B. Lakshminarayana, and J. Burningham. "Flow Field in the Turbine Rotor Passage in an Automotive Torque Converter Based on the High Frequency Response Rotating Five-hole Probe Measurement Part I: Flow Field at the Design Condition (Speed Ratio 0.6)." International Journal of Rotating Machinery 7, no. 4 (2001): 253–69. http://dx.doi.org/10.1155/s1023621x01000227.

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The relative flow field in an automotive torque converter turbine was measured at three locations inside the passage (turbine 1/4 chord, mid-chord, and 4/4 chord) using a highfrequency response rotating five-hole-probe. “Jet-Wake” flow structure was found in the turbine passage. Possible flow separation region was observed at the core/suction side at the turbine1/4chord and near the suction side at the turbine mid-chord. The mass averaged stagnation pressure drop is almost evenly distributed along the turbine flow path at the design condition(SR=0.6). The pressure drop due to centrifugal and C

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Volkov, A. V., A. G. Parygin, A. A. Vikhlyantsev, and A. A. Druzhinin. "On optimization of flow passages of impellers of centrifugal pumps." Safety and Reliability of Power Industry 11, no. 4 (2019): 311–18. http://dx.doi.org/10.24223/1999-5555-2018-11-4-311-318.

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The conventional solution for HAPPs is the use of reversible hydraulic machines operating both in the pump mode as well as in the turbine mode. At the same time, for example, a blade system of a hydraulic machine designed for the pumping mode has a high efficiency. However, in the turbine mode, the energy characteristics of such machine are far from optimal. Considering different patterns of micro- and mini-HAPPs (up to 100 kW) of modular design, it is most appropriate to use a pump and a turbine separately, since the efficiency of hydraulic machines is very important in the case of such low p

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Kim, Jin-Woo, Jun-Won Suh, Young-Seok Choi, et al. "Simultaneous efficiency improvement of pump and turbine modes for a counter-rotating type pump-turbine." Advances in Mechanical Engineering 8, no. 11 (2016): 168781401667668. http://dx.doi.org/10.1177/1687814016676680.

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Yan, Jianru, Zhitao Zuo, Wenbin Guo, Hucan Hou, Xin Zhou, and Haisheng Chen. "Influences of wear-ring clearance leakage on performance of a small-scale pump-turbine." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 4 (2019): 454–69. http://dx.doi.org/10.1177/0957650919865052.

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Wear-ring clearance leakage would affect performance of pump-turbine significantly. In this paper, the variation of the leakage and efficiency of flat ring seal and labyrinth seal are numerically studied on one pump-turbine when the width of clearance is 0.2 mm and 0.5 mm. The result shows that the effect of leakage flow cannot be neglected. The pump-turbine performance affected by leakage in turbine mode is more than that in pump mode at the same sealing structure and width of clearance. Each component’s proportion of total pressure loss hardly varies with flow rate at pump mode, which is opp

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Morani, Maria Cristina, Armando Carravetta, Oreste Fecarotta, and Aonghus McNabola. "Energy Transfer from the Freshwater to the Wastewater Network Using a PAT-Equipped Turbopump." Water 12, no. 1 (2019): 38. http://dx.doi.org/10.3390/w12010038.

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A new strategy to increase the energy efficiency in a water network exists using turbo pumps, which are systems consisting of a pump and a turbine directly coupled on a same shaft. In a turbo pump, the pump is fed by a turbine that exploits a surplus head in a freshwater network in order to produce energy for one system (wastewater) and reduce the excess pressure in another (drinking water). A pump as turbine (PAT) may be preferred over a classic turbine here due to its lower cost. The result of such a coupling is a PAT–pump turbocharger (P&P). In this research, the theoretical performance

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Wang, Longyan, Stephen Ntiri Asomani, Jianping Yuan, and Desmond Appiah. "Geometrical Optimization of Pump-As-Turbine (PAT) Impellers for Enhancing Energy Efficiency with 1-D Theory." Energies 13, no. 16 (2020): 4120. http://dx.doi.org/10.3390/en13164120.

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This paper presents a multi-objective optimization strategy for pump-as-turbines (PAT), which relies on one-dimensional theory and analysis of geometrical parameters. In this strategy, a theoretical model, which considers all possible losses incurred (mainly by the components of pipe inlet, impeller and volute), has been put forward for performance prediction of centrifugal pumps operating as turbines (PAT). With the established mathematical relationship between the efficiency of PAT (both at pump and turbine mode) and the impeller controlling variables, the geometric optimization of the PAT i

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Shi, FengXia, JunHu Yang, and XiaoHui Wang. "Analysis on the effect of variable guide vane numbers on the performance of pump as turbine." Advances in Mechanical Engineering 10, no. 6 (2018): 168781401878079. http://dx.doi.org/10.1177/1687814018780796.

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To study the effects of different guide vane numbers on the unsteady performance of pump as turbine based on the Navier–Stokes equation and standard k-epsilon turbulence model, computation fluid dynamics technology was used to simulate the flow field in pump as turbine. The turbulent kinetic energy, unsteady radial forces, and power losses were also clarified. The results show that for turbines with a guide vane, the distribution of turbulent kinetic energy is more uniform than before, and the radial force vector distribution is more symmetrical within four quadrants. The time-domain distribut

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Purece, Cristian, and Lilica Corlan. "Archimedean screw as fish-friendly turbines for harnessing hydropower potential." E3S Web of Conferences 286 (2021): 02007. http://dx.doi.org/10.1051/e3sconf/202128602007.

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Hydraulic energy is one of the most important sources of renewable energy today. It is also a complementary source to other renewable energy sources, being the only one that offers an important nonpolluting storage capacity (through pump storage facilities). Another essential quality of hydraulic energy is its ability to regulate the energy system to allow the integration of other sources, in which the process of generating energy depends on factors that cannot be controlled (sun, wind, etc.). However, hydropower plants can damage ecosystems, especially by affecting fish within their turbines.

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Stansby, Peter. "Reduction of wave-induced pitch motion of a semi-sub wind platform by balancing heave excitation with pumping between floats." Journal of Ocean Engineering and Marine Energy 7, no. 2 (2021): 157–72. http://dx.doi.org/10.1007/s40722-021-00194-y.

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AbstractIt is desirable to control pitch motion of semi-submersible wind platforms to reduce turbine hub acceleration and increase structural fatigue life. This is achieved by balancing the moment on the platform due to heave float excitation by generating a differential internal head of water between the floats though a pump. This is demonstrated with an experimentally validated linear diffraction-radiation-drag model of an idealised platform. Different scales of platform are considered corresponding to 5, 10 and 20 MW turbines. The pitch angles and hub accelerations generally reduce as scale

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Jemal, Abdulbasit Nasir, and Misrak Girma Haile. "Comprehensive Review of Pump as Turbine." Renewable Energy and Sustainable Development 5, no. 2 (2019): 68. http://dx.doi.org/10.21622/resd.2019.05.2.068.

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Trivedi, Jvalant B., Niraj K. Shah, Jaydeep Trivedi, and Vishal Chauhan. "Hydraulic Analysis of Vertical Turbine Pump." INROADS- An International Journal of Jaipur National University 5, no. 1s (2016): 347. http://dx.doi.org/10.5958/2277-4912.2016.00065.5.

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A.Y, Nikumbe, Tamboli V.G, and Wagh H.S. "Modal Analysis of Vertical Turbine Pump." IARJSET 2, no. 5 (2015): 117–21. http://dx.doi.org/10.17148/iarjset.2015.2525.

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Ruchonnet, N., and O. Braun. "1D simulation of pump-turbine transition." Journal of Physics: Conference Series 813 (April 4, 2017): 012039. http://dx.doi.org/10.1088/1742-6596/813/1/012039.

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SHINHAMA, Hitoshi, Junichiro FUKUTOMI, Yoshiyuki NAKASE, Yontao CHIN, Tadaaki KUWAUCHI, and Sunao MIYAUCHI. "Study on Reverse Running Pump Turbine." Transactions of the Japan Society of Mechanical Engineers Series B 65, no. 638 (1999): 3399–405. http://dx.doi.org/10.1299/kikaib.65.3399.

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