Relevant bibliographies by topics / Impulse turbine

Contents

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

Academic literature on the topic 'Impulse turbine'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "Impulse turbine"

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Astro, Richardo Barry, Hamsa Doa, and Hendro Hendro. "FISIKA KONTEKSTUAL PEMBANGKIT LISTRIK TENAGA MIKROHIDRO." ORBITA: Jurnal Kajian, Inovasi dan Aplikasi Pendidikan Fisika 6, no. 1 (May 10, 2020): 142. http://dx.doi.org/10.31764/orbita.v6i1.1858.

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ABSTRAKPenelitian ini bertujuan untuk mengetahui prinsip dasar dan sistem kerja pembangkit listrik tenaga mikrohidro (PLTMH) dari sudut pandang fisika sebagai upaya penyediaan dan pengembangan sumber belajar kontekstual. Penelitian ini dilaksanakan menggunakan metode studi literatur, observasi, dan wawancara. Hasilnya ditemukan bahwa PLTMH memiliki tiga komponen utama yakni air sebagai sumber energi, turbin, dan generator. Skema konversi energi pada PLTMH yang menggunakan head adalah sebagai berikut: 1) energi potensial air dari reservoir diubah menjadi energi kinetik pada pipa pesat, 2) energi kinetik air diubah menjadi energi mekanik oleh turbin air, 3) energi mekanik diubah menjadi energi listrik oleh generator. Turbin air berdasarkan prinsip kerja dibagi atas turbin impuls dan turbin reaksi. Turbin impuls memanfaatkan perubahan momentum air sebelum dan setelah menabrak sudu turbin, sedangkan turbin reaksi memanfaatkan perbedaan tekanan pada permukaan sudu. Generator bekerja berdasarkan prinsip induksi elektromagnetik. Ketika rotor generator yang terkopel pada turbin berputar, kumparan konduktor akan memotong garis medan magnet sehingga timbul tegangan induksi. Kata kunci: pembangkit listrik tenaga mikrohidro; konversi energi; turbin, generator. ABSTRACTThe research aims to determine the fundamental principles and working systems of Microhydro power plants from a physical standpoint as an effort to provide and develop contextual learning resources. This study was conducted using literature, observation and interview methods. The results found that PLTMH had three main components i.e. water as energy source, turbine, and generator. The energy conversion scheme on PLTMH that uses the head is as follows: 1) The potential energy of water from the reservoir is converted into kinetic energy on the rapid pipeline, 2) water kinetic energy converted into mechanical energy by water turbine, 3) changed mechanical energy into electrical energy by generators. The water turbine based on the working principle is divided into impulse turbines and reaction turbines. The impulse turbine utilizes a change in water momentum before and after crashing the turbine's sudu, while the reaction turbine utilizes pressure differences on the surface of the Sudu. The generators work based on electromagnetic induction principles. When the rotor generator is attached to the turbine spinning, the conductor coil will cut off the magnetic field line so that the induction voltage arises. Keywords: microhydro power plant; energy conversion; turbine; generator.
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Takao, Manabu, and Toshiaki Setoguchi. "Air Turbines for Wave Energy Conversion." International Journal of Rotating Machinery 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/717398.

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This paper describes the present status of the art on air turbines, which could be used for wave energy conversion. The air turbines included in the paper are as follows: Wells type turbines, impulse turbines, radial turbines, cross-flow turbine, and Savonius turbine. The overall performances of the turbines under irregular wave conditions, which typically occur in the sea, have been compared by numerical simulation and sea trial. As a result, under irregular wave conditions it is found that the running and starting characteristics of the impulse type turbines could be superior to those of the Wells turbine. Moreover, as the current challenge on turbine technology, the authors explain a twin-impulse turbine topology for wave energy conversion.
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Das, Tapas Kumar, Paresh Halder, and Abdus Samad. "Optimal design of air turbines for oscillating water column wave energy systems: A review." International Journal of Ocean and Climate Systems 8, no. 1 (February 1, 2017): 37–49. http://dx.doi.org/10.1177/1759313117693639.

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Oscillating water column wave energy harvesting system uses pneumatic power to run a turbine and generate power. Both reaction (mainly Wells turbine) and impulse type turbines are tested in oscillating water column system and the performances are investigated. Reaction turbines are easy to install, and the operating range is narrow and possesses higher peak efficiency. On the contrary, impulse turbines have the wider operating range and lower peak efficiency. Some of the key parameters for Wells turbine are solidity, tip clearance, and the hub-to-tip ratio. Significant performance improvement is possible by redesigning the turbines using optimization techniques. Till date, surrogate modeling and an automated optimization library OPAL are commonly used in optimization of oscillating water column air turbines. In this article, various types of oscillating water column turbines are reviewed, and optimization techniques applied to such turbines are discussed. The Wells turbine with guide vane has the maximum efficiency, whereas the axial-impulse turbine with pitch-controlled guide vane has the widest operating range. Turbines with optimized geometry have better overall performance than other turbines.
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Winarto, Eko Wismo, Sugiyanto Sugiyanto, Soeadgihardo Siswantoro, and Isworo Djati. "Turbin Hibrid Bi-Directional Sebagai Pemanen Energi pada Thermoacoustic Engine." Jurnal Rekayasa Mesin 12, no. 1 (May 31, 2021): 19. http://dx.doi.org/10.21776/ub.jrm.2021.012.01.3.

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Bi-directional turbines that are commonly applied to convert wave energy into motion energy are the types of Impulse turbines and Wells turbines. Both types of turbines each have advantages and disadvantages. In this research, hybrid turbine type is designed and made to bridge the weaknesses in impulse turbine and turbine wells. Hybrid turbines are made by placing impulse turbines on the outside while turbine wells placed on the inside. In this research, the variation of hybrid bi-directional turbine design aims to find out the most optimal design of this turbine type. Six variations were carried out including a hub to tip ratio of 0.5 with 4 and 5 Wells blades, a hub to tip ratio of 0.6 with 4 and 5 Wells blades, and a hub to tip ratio of 0.7 with 4 and 5 Wells blades. From the test results on thermoacoustic engine media, based on the hub to tip ratio, the most optimal hub to tip ratio is in the order of 0.7 then 0.6, and 0.5. Whereas based on the number of Wells blade, obtained the number of Wells blade 5 is more optimal than the number of Wells blade 4.
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Gordon, J. L. "Hydraulic turbine efficiency." Canadian Journal of Civil Engineering 28, no. 2 (April 1, 2001): 238–53. http://dx.doi.org/10.1139/l00-102.

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A set of empirical equations has been developed which defines the peak efficiency and shape of the efficiency curve for hydraulic turbines as a function of the commissioning date for the unit, rated head, rated flow, runner speed, and runner throat or impulse turbine jet diameter. The equations are based on an analysis of peak efficiency data from 56 Francis, 33 axial-flow, and eight impulse runners dating from 1908 to the present, with runner diameters ranging from just under 0.6 m to almost 9.5 m. The metric specific speeds (nq) ranged from 5.3 to 294. The root mean square error of the calculated peak efficiency for Francis and axial-flow runners was found to be 0.65%. The shape of the efficiency curves was derived from eight Francis, five Kaplan, three propeller, and four impulse turbines. Charts showing the relationship between calculated and actual efficiency curves for these 20 runners are provided. A good match between calculated and measured or guaranteed efficiency was obtained. The equations were also used to determine the relative increase in peak efficiency for new reaction runners installed in existing casings at 22 powerplants, with a root mean square accuracy of 1.0%. The equations can be used to (i) develop efficiency curves for new and old runners; (ii) compare the energy output of alternative types of turbines, where this choice is available; and (iii) calculate the approximate incremental energy benefit from installing a new runner in an existing reaction turbine casing, or onto the shaft of an impulse unit.Key words: hydraulic turbines, turbine renovation, turbine efficiency.
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Gupta, Vishal, Ruchi Khare, and Vishnu Prasad. "Performance Evaluation of Pelton Turbine: A Review." Hydro Nepal: Journal of Water, Energy and Environment 13 (March 13, 2014): 28–35. http://dx.doi.org/10.3126/hn.v13i0.10042.

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Earlier only experimental techniques were used to predict the performance of turbines. With advanced numerical techniques and increase in processing power of computers, Computational Fluid Dynamics (CFD) has emerged as an effective tool for the performance prediction of Pelton hydraulic turbine involving multi-fluid flow. Extensive work has been done for design optimization of reaction turbines using CFD. Now it is being extended for impulse turbines. The flow in reaction turbines involves only water as working medium, but in case of impulse turbines, water and air are working medium. The water jet issued from nozzle is surrounded by air and pressure around the jet and turbine is atmospheric. The performance of Pelton turbine depends upon the shape, size and quality of jet as well as shape of the buckets. In the present paper, the literature review on applications of CFD for performance prediction, design optimization of Pelton turbine have been discussed.DOI: http://dx.doi.org/10.3126/hn.v13i0.10042HYDRO NEPAL Journal of Water, Energy and EnvironmentIssue No. 13, July 2013Page: 28-35Uploaded date: 3/13/2014
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Valladares, Aitor Vega, Manuel Garcia Díaz, Bruno Pereiras, and José Gonzalez Pérez. "Influence of the blade leaning angle on the performance of a radial impulse turbine for OWC converters." Journal of Physics: Conference Series 2217, no. 1 (April 1, 2022): 012072. http://dx.doi.org/10.1088/1742-6596/2217/1/012072.

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Abstract Oscillating Water Column systems (OWC) have been in the spotlight in the last 20 years since these devices are considered one of the most promising devices among wave energy technology. These systems produce electricity by means a generator driven by a turbine, which takes advantage of the bidirectional flow created by the OWC itself. Among these turbines suitable for bidirectional flows, it is possible to find radial impulse turbines, which are the focus of this work. Traditionally, the radial impulse turbines have shown lower efficiencies than their competitors. However, the radial turbines present interesting mechanical features and, recently, some research show that the difference has been reduced. Following this thread, this work deals with another modification in the radial impulse turbine looking for a further improvement. By using a validated CFD model, it has been analysed the influence of the lean angle of the blade. Until now, all the turbines present in the literature are leaned zero degrees, leading to a strong interaction between the guide vanes and the blades. This work shows results of the same turbine, equipped with blades leaning from -5deg to 25deg, in order to determine the influence such a modification on the maximum total-to-static efficiency. Results have revealed a slight improvement in the maximum efficiency for positive leaning angles, whereas negative angles drive the turbine to worse performance.
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Khurana, Sourabh, Dr Varun, and Anoop Kumar. "Experimental Investigation of Erosion and Performance of Turgo Impulse Turbine." Hydro Nepal: Journal of Water, Energy and Environment 12 (October 29, 2013): 76–79. http://dx.doi.org/10.3126/hn.v12i0.9038.

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he present study has been carried out to investigate the effect of silt size, concentration, jet velocity, nozzle angle and operating hour on the erosive wear as well as on the performance of the Turgo impulse turbine in actual flow conditions. Samples of silt were collected from the Beas River (India) near the Pandoh dam. It has been found experimentally that silt parameters, nozzle angle and operating hour of the Turgo turbine increases the erosive wear rate in the turbine components causing efficiency loss in the Turgo impulse turbine and final breakdown of hydro turbines. Hydro Nepal; Journal of Water, Energy and Environment Vol. 12, 2013, January Page:76-79DOI: http://dx.doi.org/10.3126/hn.v12i0.9038 Uploaded Date : 10/29/2013
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Ogawa, T., M. Takao, M. M. A. Alam, S. Okuhara, and Y. Kinoue. "A study of counter-rotating impulse turbine for wave energy conversion-effect of middle vane thickness on the performance-." Journal of Physics: Conference Series 2217, no. 1 (April 1, 2022): 012073. http://dx.doi.org/10.1088/1742-6596/2217/1/012073.

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Abstract In an oscillating water column (OWC) based wave energy device, a water column that oscillates due to the sea wave motion generates a bi-directional airflow in an air chamber, and finally, the bi-directional airflow driven air turbine converts the pneumatic energy into mechanical energy. The counter-rotating impulse turbine for bi-directional airflow has been proposed by M. E. McCormick of the United States Naval Academy in 1978. In a previous study, the authors investigated the effect of the turbine geometry on the performance of a counter-rotating impulse turbine for bi-directional airflow, and it was clarified that the efficiency of the turbine is higher than an impulse turbine with a single rotor for bi-directional airflow in a range of high flow coefficient. Moreover, this impulse turbine has a disadvantage that the efficiency in a range of low flow coefficient is remarkably low due to the deterioration of the flow between the two rotors. In this study, in order to make the counter-rotating impulse turbine practically compatible, the thickness of the middle vanes installed between the two rotors was changed, and the effect of the thickness on the turbine performance was investigated by the computational fluid dynamics (CFD) analysis. As a result, it was found that the efficiency of the counter-rotating impulse turbine with middle vanes increases as the thickness of the middle vanes decreased.
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Saad, Mina, Manuel García-Diaz, and Bruno Pereiras. "Analysis of an optimized radial impulse turbine for an OWC wave energy converter." Journal of Physics: Conference Series 2217, no. 1 (April 1, 2022): 012075. http://dx.doi.org/10.1088/1742-6596/2217/1/012075.

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Abstract OWC concept is one of the most spread technologies among wave energy converters due to several reasons. However, this technology has always deal with the problem of the inherent bidirectional flow. Many solutions have been adopted such as a flow rectification system combined with a unidirectional turbine, several types of bidirectional turbines such as Wells turbine or impulse turbine. In this work, it is shown the performance of an optimized geometry for a radial impulse turbine, which improvement is based on the re-designing of the blades and settling angles of the vanes. A CFD model, validated against results from the bibliography, has been used to simulate both a new and a previous geometry taken as reference. The results of both turbines have been analysed in terms of the loss coefficients for each element in order to analyse the advantages of the new geometry. It has been found that the new geometry exceeds the efficiency of the previous geometry by 5%, being this gain based on the fact that sacrificing the rotor’s efficiency could lead to a great improvement in the performance of the guide vanes, reducing their loss and, in turn, lifting the turbine’s efficiency despite reducing the rotor’s one.
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Dissertations / Theses on the topic "Impulse turbine"

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Tøndell, Espen. "CO2-expansion work recovery by impulse turbine." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1261.

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Dahlqvist, Johan. "Impulse Turbine Efficiency Calculation Methods with Organic Rankine Cycle." Thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104174.

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A turbine was investigated by various methods of calculating its efficiency. The project was based on an existing impulse turbine, a one-stage turbine set in an organic Rankine cycle with the working fluid being R245fa. Various methods of loss calculation were explored in the search for a method sufficiently accurate to make valid assumptions regarding the turbine performance, while simple enough to be time efficient for use in industrial research and development.  The calculations were primarily made in an isentropic manner, only taking into account losses due to the residual velocity present in the exit flow. Later, an incidence loss was incorporated in the isentropic calculations, resulting in additional losses at off-design conditions. Leaving the isentropic calculations, the work by Tournier, “Axial flow, multi-stage turbine and compressor models” was used. The work presents a method of calculating turbine losses separated into four components: profile, trailing edge, tip clearance and secondary losses. The losses applicable to the case were implemented into the model. Since the flow conditions of the present turbine are extreme, the results were not expected to coincide with the results of Tournier. In order to remedy this problem, the results were compared to results obtained through computational fluid dynamics (CFD) of the turbine. The equations purposed by Tournier were correlated in order to better match the present case. Despite that the equations by Tournier were correlated in order to adjust to the current conditions, the results of the losses calculated through the equations did not obtain results comparable to the ones of the available CFD simulations. More research within the subject is necessary, preferably using other software tools.
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Vaľočík, Jan. "Modernizace VT dílu parní turbiny 300 MW." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231485.

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The aim of this master‘s thesis is retrofit of a 300 MW tandem compound steam turbinetype K300 - 170 with three casings and reheat of steam. In the first part a heat balance of the cycle is calculated for given nominal parameters. Further the thesis is focused only on the high pressure section of the turbine, for which the flow section is designed based on thermodynamic calculations and appropriate blade profiles are selected. Then the stress control of the blading is done. The thesis is concluded with estimation of power loss due to shaft seals and real power output of the turbine is calculated. This thesis also includes a drawing of axial section of the high pressure section of the turbine.
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Tøndell, Espen. "CO2-expansion work recovery by impulse turbine." Doctoral thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1261.

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Nytra, Petr. "Retrofit parní turbíny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443171.

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Topic of this diploma thesis is thermodynamical recalculation of turbine TG3 for different parameters and new design of its blading. Introduction deals with theoretical basics of turbines and their components. Second part explains general reasons for retrofit and then specifically for Heating plant Olomouc, where TG3 is located. Third part includes used calculating methods and formulas. Last part presents results, which were calculated in software MS Excel. A cross section drawing is attachment of this thesis.
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Siuda, Radim. "Kondenzační parní turbina." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231428.

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This master’s thesis deals with design of a high speed steam turbine with detachable condensation module and integrated gearbox. As a source of energy is used heat waste, which is a result of the diesel engines function. Important options concerning conception of the turbo set are discussed in the master’s thesis. Subsequently, thermodynamic calculations for each module are done. Part of the thesis is also simplified calculation of the integral gearbox. Construction drawings of all modules and of the complete turbo set with electrical generator were created based on thermodynamic calculation.
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Schneider, Abraham 1981. "Dynamic modeling of high-speed impulse turbine with elastomeric bearing supports." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/89911.

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Velez, Carlos Alberto Busto. "CFD analysis of a uni-directional impulse turbine for wave energy conversion." Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4714.

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Ocean energy research has grown in popularity in the past decade and has produced various designs for wave energy extraction. This thesis focuses on the performance analysis of a uni-directional impulse turbine for wave energy conversion. Uni-directional impulse turbines can produce uni-directional rotation in bi-directional flow, which makes it ideal for wave energy extraction as the motion of ocean waves are inherently bi-directional. This impulse turbine is currently in use in four of the world's Oscillating Wave Columns (OWC). Current research to date has documented the performance of the turbine but little research has been completed to understand the flow physics in the turbine channel. An analytical model and computational fluid dynamic simulations are used with reference to experimental results found in the literature to develop accurate models of the turbine performance. To carry out the numerical computations various turbulence models are employed and compared. The comparisons indicate that a low Reynolds number Yang-shih K-Epsilon turbulence model is the most computationally efficient while providing accurate results. Additionally, analyses of the losses in the turbine are isolated and documented. Results indicate that large separation regions occur on the turbine blades which drastically affect the torque created by the turbine, the location of flow separation is documented and compared among various flow regimes. The model and simulations show good agreement with the experimental results and the two proposed solutions enhance the performance of the turbine showing an approximate 10% increase in efficiency based on simulation results.
ID: 030646261; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (M.S.A.E.)--University of Central Florida, 2011.; Includes bibliographical references (p. 81-82).
M.S.A.E.
Masters
Mechanical and Aerospace Engineering
Engineering and Computer Science
Aerospace Engineering; Thermofluid Aerodynamics Systems Track
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Novák, Martin. "Retrofit parní turbiny 250 MW na biomasu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230569.

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There is a description of modernisation steam condensing turbine in this Master´s thesis. Electric output is decreased from 250 MW to 160 MW. This thesis is divided into two parts, there is a calculation of heat balance in first part and a calculation of blading in second part. Detail drawing and heat balance are the most important results of this Master´s thesis.
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Holt, Daniel B. "Design, fabrication, and testing of a miniature impulse turbine driven by compressed gas /." Online version of thesis, 2004. http://hdl.handle.net/1850/11793.

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Books on the topic "Impulse turbine"

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Institution, British Standards. Cavitation pitting evaluation in Pelton turbines (impulse turbines). London: BSI, 1995.

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Shepherd, Kevin P. Detection of low frequency impulsive noise from large wind turbine generators. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1985.

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Richardson, Alexander. Evolution of the Parsons Steam Turbine: An Account of Experimental Research on the Theory, Efficiency, and Mechanical Details of Land and Marine Reaction and Impulse-Reaction Turbines. University of Cambridge ESOL Examinations, 2016.

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Richardson, Alexander. Evolution of the Parsons Steam Turbine: An Account of Experimental Research on the Theory, Efficiency, and Mechanical Details of Land and Marine Reaction and Impulse-Reaction Turbines. University of Cambridge ESOL Examinations, 2014.

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Book chapters on the topic "Impulse turbine"

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Rixen, Daniel, and Nazgol Haghighat. "Truncating the Impulse Responses of Substructures to Speed Up the Impulse-Based Substructuring." In Topics in Experimental Dynamics Substructuring and Wind Turbine Dynamics, Volume 2, 137–48. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-2422-2_14.

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Badhurshah, Rameez, and Abdus Samad. "Optimization of an Impulse Turbine for Efficient Wave Energy Extraction." In Ocean Wave Energy Systems, 445–70. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78716-5_15.

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Venkatesh, P. H. J., Vivek Viswanadha, K. Sravan Kumar, and Koyyana Ramesh. "Design of Pico Hydro Power Plant Using an Impulse Turbine." In Advanced Manufacturing Systems and Innovative Product Design, 251–60. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9853-1_20.

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Ogawa, T., M. Takao, S. Okuhara, S. Sasaki, M. M. Ashraful Alam, and Y. Kinoue. "Numerical analysis of counter-rotating impulse turbine for wave energy conversion." In Trends in Renewable Energies Offshore, 743–47. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003360773-83.

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Kanetsuki, K., M. Takao, Y. Ito, S. Okuhara, M. M. Ashraful Alam, Y. Kinoue, and T. Setoguchi. "Study on impulse turbine for bi-directional airflow with asymmetric cascade." In Trends in Renewable Energies Offshore, 737–42. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003360773-82.

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Ashish, Shubham, Sagar Saraswat, Sagar Garg, and Alok Kumar Pandey. "Design of Pole Placement-Based State Feedback Controller for a Impulse Hydro Turbine." In Advances in Intelligent Systems and Computing, 463–68. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8618-3_49.

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van der Valk, P. L. C., and D. J. Rixen. "An Effective Method for Assembling Impulse Response Functions to Linear and Non-linear Finite Element Models." In Topics in Experimental Dynamics Substructuring and Wind Turbine Dynamics, Volume 2, 123–35. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-2422-2_13.

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Harvey, Adam. "10. Introduction; Impulse Turbines; Pelton Turbines; Turgo Turbines." In Micro-Hydro Design Manual, 153–72. Rugby, Warwickshire, United Kingdom: Practical Action Publishing, 1993. http://dx.doi.org/10.3362/9781780445472.010.

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Bachschmid, N., E. Tanzi, E. Pesatori, and S. Bistolfi. "Modeling Impulse Periodic Excitation of Blade Rows in Steam Turbines in Partial Arc Admission Conditions." In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 155–68. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_13.

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Andersen, Kristian Gjerrestad, Gbanaibolou Jombo, Sikiru Oluwarotimi Ismail, Yong Kang Chen, Hom Nath Dhakal, and Yu Zhang. "Damage Characterisation in Composite Laminates Using Vibro-Acoustic Technique." In Springer Proceedings in Energy, 275–82. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_34.

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AbstractThe need to characterise in-service damage in composite structures is increasingly becoming important as composites find higher utilisation in wind turbines, aerospace, automotive, marine, among others. This paper investigates the feasibility of simplifying the conventional acousto-ultrasonic technique set-up for quick and economic one-sided in-service inspection of composite structures. Acousto-ultrasonic technique refers to the approach of using ultrasonic transducer for local excitation while sensing the material response with an acoustic emission sensor. However, this involves transducers with several auxiliaries. The approach proposed herewith, referred to as vibro-acoustic testing, involves a low level of vibration impact excitation and acoustic emission sensing for damage characterisation. To test the robustness of this approach, first, a quasi-static test was carried out to impute low-velocity impact damage on three groups of test samples with different ply stacking sequences. Next, the vibro-acoustic testing was performed on all test samples with the acoustic emission response for the samples acquired. Using the acoustic emission test sample response for all groups, the stress wave factor was determined using the peak voltage stress wave factor method. The stress wave factor results showed an inverse correlation between the level of impact damage and stress wave factor across all the test sample groups. This corresponds with what has been reported in literature for acousto-ultrasonic technique; thus demonstrating the robustness of the proposed vibro-acoustic set-up. Structural health monitoring, impact damage, acousto-ultrasonic testing, non-destructive testing.
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Conference papers on the topic "Impulse turbine"

1

Shimanov, A. A., I. A. Neverov, D. A. Uglanov, A. L. Lopatin, and A. I. Dovgyallo. "Experimental Research of Impulse Turbine." In 2020 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon). IEEE, 2020. http://dx.doi.org/10.1109/fareastcon50210.2020.9271173.

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2

Sheets, Herman E. "The Impulse Blower." In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-194.

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The impulse blower provides essentially constant relative flow velocity through the impeller so that impeller blade entrance and exit velocity are equal. This results in a large guide vane entrance velocity and requires relatively large guide vane flow deflections. Special consideration must be given to assure that the flow through the blower is established in the desired direction. The impulse blower can operate with a large pressure coefficient which in turn permits using a small impeller diameter together with a small casing. Two blowers have been built and tested to evaluate performance and noise of impulse blowers. They confirm the expected reduction in size, weight and space under otherwise similar operating conditions.
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3

Radulescu, Dan, Georgel Vizitiu, and Marius Deaconu. "Numerical study of a thermoacoustic impulse turbine." In CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5114369.

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4

LI, BING, and Wen-Hui WU. "Simulation of Micro Partial Admission Impulse Turbine." In 3rd International Conference on Material Engineering and Application (ICMEA 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icmea-16.2016.97.

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5

Takao, Manabu, Md Mahbubu Alam, Toshiaki Setoguchi, and V. Jayashankar. "Experimental Study on a Twin Unidirectional Impulse Turbine for Wave Energy Conversion." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-07029.

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A twin unidirectional impulse turbine has been proposed in order to enhance the performance of wave energy plant. This turbine system uses two unidirectional impulse turbines and their flow direction is different each other. However, the turbine characteristics have not been clarified to date. The performances of a unidirectional impulse turbine under steady flow conditions were investigated experimentally by using a wind tunnel with large piston/cylinder in this study.
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6

Khatri, Rasish K., Lawrence A. Hawkins, and Claude Bazergui. "Demonstrated Operability and Reliability Improvements for a Prototype High-Speed Rotary-Disc Atomizer Supported on Active Magnetic Bearings." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43803.

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A state-of-the-art, rotary-disc atomizer driven by a permanent-magnet electric motor and supported by active magnetic bearings (AMB) was designed, fabricated, and tested as part of a spray-dryer system within a pharmaceutical-processing plant. The atomizing process imposed several challenges on the AMBs, including large, highly-dynamic rotor imbalances and large, quasi-periodic external radial impulses. Several design changes were systematically implemented to mitigate the effects of large rotor imbalances. A novel impulse detection and recovery system was introduced to alleviate the effects of external impulses. These changes, which have steadily improved the operability and reliability of the machine, are described here along with field test data.
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7

George, A., Balakrishnan Ranjith, A. Samad, and P. V. Dudhgaonkar. "Evaluation of Impulse Turbines for a Wave Energy Converter." In ASME 2017 Gas Turbine India Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gtindia2017-4567.

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The extraction of wave energy through self-rectifying air turbine is one of the emerging technologies for oscillating water column (OWC) based wave energy devices. In the present effort, a bi-directional impulse (BDI) turbine is designed and the performance parameters were found numerically and compared with an existing unidirectional impulse (UDI) turbine. A brief analytical formulation through similarity laws, to find a dynamically similar BDI turbine using pressure drop vs flow characteristics, gives the approximate diameter range equivalent to the reference UDI turbine. The results are used to reduce the range of diameters and it is found that the characteristics are matching with the reference UDI turbine. The maximum and minimum diameters among the selected range are considered for detailed computational fluid dynamics (CFD) analysis. These two BDI turbines are modeled and meshed in ICEM CFD 14.5. The commercial CFD code CFX 14.5 is used for the numerical simulations. The Reynolds-averaged Navier-Stokes (RANS) equations with the standard k-ϵ scalable wall function model are solved to obtain the performance parameters. A detailed flow physics of the BDI turbines has also been included.
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8

Sato, Hideki, Manabu Takao, Shinya Okuhura, Miah Md Ahsraful Alam, and Toshiaki Setoguchi. "A Twin Unidirectional Impulse Turbine With Fluidic Diode for Wave Energy Conversion." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-22585.

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As an air turbine equipped with oscillating water column (OWC) based wave energy plant, a rectification-valve system has been invented to date. However, this turbine system has problems with the durability of the valves and the complex mechanism. Moreover, it has a major fault in that the valves must be large for high output. Therefore, a twin unidirectional impulse turbine topology has been suggested in previous studies in order to use conventional unidirectional turbines without valves [1, 2]. The topology is composed of two unidirectional impulse turbines. However, the past study indicated that the mean efficiency of the topology was shown to be low, when the performance prediction of the topology in oscillating airflow was carried out by means of quasi-steady analysis [2]. Further, the cause of the low efficiency is because part of the air flow gets through the unidirectional impulse turbine in the direction of low efficiency [2]. In this study, a fluidic diode [3, 4] is adopted in order to suppress the air flow rate into the inefficient turbine in a twin unidirectional impulse turbine topology for wave energy plant, and the effect of the fluidic diodes on the performance of twin unidirectional impulse turbine topology is investigated by a wind tunnel test and computational fluid dynamics (CFD). Further, its usefulness is discussed from a view point of the turbine mean efficiency under unsteady flow condition.
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9

Pereiras, B., F. Castro, A. El Marjani, and M. A. Rodriguez. "Radial Impulse Turbine for Wave Energy Conversion: A New Geometry." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57951.

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The Oscillating Water Column system (OWC) is an interesting concept for ocean wave energy extraction. Several kinds of air turbines have been used for pneumatic energy conversion to mechanical energy. The Wells turbine has been used widely in OWC plants. However, as an alternative the self-rectifying turbine called Impulse turbine has been studied during the last years. We are interested in the radial version of the Impulse turbine, which was initially proposed by McCormick. A former research work aimed to improve the knowledge of the local flow behaviour and the prediction of the performances for this kind of turbine has been carried out using CFD (FLUENT®). The objectives of that work were connected mainly to the elaboration of a suitable 3D model for air flow simulation in a radial Impulse turbine. Model validation was conducted through a comparison with available experimental results. In the present, the objective is, using the numerical model, to develop a new radial impulse turbine geometry that gets better performances than the original one. This new turbine geometry will be exploited next in a project for an OWC of 250 kW. In this paper we describe the flow behaviour and the performances of this new turbine. For that, we study the Torque and Input coefficients, the losses and flow direction in the turbine elements.
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10

Kunte, Harald, and Joerg Seume. "Partial Admission Impulse Turbine for Automotive ORC Application." In 11th International Conference on Engines & Vehicles. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2013. http://dx.doi.org/10.4271/2013-24-0092.

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