Relevant bibliographies by topics / Low specific speed pump

Contents

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

Academic literature on the topic 'Low specific speed pump'

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

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Journal articles on the topic "Low specific speed pump"

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Choi, Young-Do, Junichi Kurokawa, and Jun Matsui. "Performance and Internal Flow Characteristics of a Very Low Specific Speed Centrifugal Pump." Journal of Fluids Engineering 128, no. 2 (September 5, 2005): 341–49. http://dx.doi.org/10.1115/1.2169815.

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In very low specific speed range (ns<0.25), the efficiency of the centrifugal pump designed by the conventional method becomes remarkably low. Therefore, positive-displacement pumps have been widely used for long. However, the positive-displacement pumps remain associated with problems such as noise and vibration and they require high manufacturing precision. Since the recently used centrifugal pumps are becoming higher in rotational speed and smaller in size, there appear to be many expectations to develop a new centrifugal pump with high performance in the very low specific speed range. The purpose of this study is to investigate the internal flow characteristics and its influence on the performance of a very low specific speed centrifugal pump. The results show that large reverse flow at the semi-open impeller outlet decreases absolute tangential velocity considerably which in turn decreases the pumping head.
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Klas, R., F. Pochylý, and P. Rudolf. "Analysis of novel low specific speed pump designs." IOP Conference Series: Earth and Environmental Science 22, no. 1 (March 1, 2014): 012010. http://dx.doi.org/10.1088/1755-1315/22/1/012010.

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Chabannes, Lilian, David Štefan, and Pavel Rudolf. "Effect of Splitter Blades on Performances of a Very Low Specific Speed Pump." Energies 14, no. 13 (June 24, 2021): 3785. http://dx.doi.org/10.3390/en14133785.

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The usage of splitter blades to enhance the performances of low specific speed pumps is common practice. Based on experimental and numerical studies, the influence of the addition of one and two splitter blades is investigated on a very low specific speed pump to assess their impact not only on the performance characteristics but also on the losses in all pump domains. First, the main characteristic curves are discussed and it is shown that the usage of splitter blades enhances the head of the pump while not impairing its efficiency. Secondly, a detailed analysis of the losses in the pump reveals that splitter blades improve the flow in all parts of the pumps, but the volute. The flow at the impeller outlet shows that splitter blades largely benefit the slip factor and discharges a more blade-congruent flow in the volute. However, higher absolute velocity at the outlet of the impeller with splitter blades increases friction at the volute wall, as confirmed by the average wall shear stress in the different tested cases.
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Torabi, Rouhollah, and Seyyed Ahmad Nourbakhsh. "The Effect of Viscosity on Performance of a Low Specific Speed Centrifugal Pump." International Journal of Rotating Machinery 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/3878357.

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Centrifugal pump delivery head and flow rate drop effectively during the pumping of viscous fluids. Several methods and correlations have been developed to predict reduction rate in centrifugal pump performance when handling viscous fluids, but their results are not in very good agreement with each other. In this study, a common industrial low specific speed pump, which is extensively used in different applications, is studied. The entire pump, including impeller, volute, pipes, front and rear sidewall gaps, and balance holes, is simulated in Computational Fluid Dynamics and 3D full Navier Stokes equations are solved. CFD results are compared with experimental data such as pump performance curves, static pressure in casing, and disk friction loss. Dimensionless angular velocity and leakage rate are investigated in sidewall gap and efficiency variation due to viscosity is studied. The results demonstrate that the behavior of the fluid in sidewall gap is strictly sensitive to viscosity. Increasing viscosity improves the volumetric efficiency by reducing internal leakage through wear rings and balance holes, causing, however, a significant fall in the disk and overall efficiency. Results lead to some recommendations for designing centrifugal pumps which may be used in transferring viscous fluids.
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Fu, Qiang, Shou Qi Yuan, and Rong Sheng Zhu. "Pressure Fluctuation of the Low Specific Speed Centrifugal Pump." Applied Mechanics and Materials 152-154 (January 2012): 935–39. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.935.

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In order to study the rules of pressure fluctuation and the radial force under different positions in a centrifugal pump with low specific speed, and to find the relationship between each other, the three-dimensional ,unsteady Reynolds-averaged Navier-stokes equations with shear stress transport turbulent models were solved. The pressure fluctuation was obtained. The results showed that the pressure fluctuations were visible. The pressure fluctuations in the volute were relatively low at the design flow rate condition. The blade passing frequency dominates the pressure fluctuations, high frequency contents were found on the outlet of impeller but no high frequency information occured in casing. The radial force on the impeller was unsteady especially at the small flow rate.
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MATSUI, Jun, Junichi KUROKAWA, Manabu HARA, Koji NAKAMURA, and Hiroshi IMAMURA. "PTV on Volute Pump of Very Low Specific-Speed." Proceedings of the JSME annual meeting 2000.4 (2000): 37–38. http://dx.doi.org/10.1299/jsmemecjo.2000.4.0_37.

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Zhao, A., P. Wu, D. Z. Wu, and L. Q. Wang. "The optimization of a low specific speed pipeline pump." IOP Conference Series: Materials Science and Engineering 52, no. 3 (December 20, 2013): 032002. http://dx.doi.org/10.1088/1757-899x/52/3/032002.

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KAGAWA, Shusaku, Jun MATSUI, Junichi KUROKAWA, and Young-Do CHOI. "Loss Analysis of Very Low Specific Speed Centrifugal Pump." Transactions of the Japan Society of Mechanical Engineers Series B 73, no. 725 (2007): 219–24. http://dx.doi.org/10.1299/kikaib.73.219.

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Jafarzadeh, B., A. Hajari, M. M. Alishahi, and M. H. Akbari. "The flow simulation of a low-specific-speed high-speed centrifugal pump." Applied Mathematical Modelling 35, no. 1 (January 2011): 242–49. http://dx.doi.org/10.1016/j.apm.2010.05.021.

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Wang, Chun Lin, Chang Jun Li, Jian Ding, and Dong Liu. "Circulation Distribution of High Specific Speed Mixed-Flow Pump." Applied Mechanics and Materials 130-134 (October 2011): 1982–85. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1982.

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The load distribution of the impeller and the shape of blade bone surface as well as the pump performance are determined by the circulation distribution from the impeller inlet to the outlet. However, perfect conclusions about optimal forms of the circulation distribution have not been seen yet. In this paper, three kinds of circulation distributions were studied. Three mixed flow pump impellers with high specific speed were designed according to the circulation distributions, and the models of the three pumps were built and modeled in the commercial CFD code ANSYS-CFX 11.0. The flow field in the pumps has been investigated using large eddy simulation (LES). Experiment was carried out on one model. And the performance curves predicted by LES were compared with the experimental data, and good agreements were achieved. The results show that: there is a low pressure area at impeller outlet. The pressure distribution along the circumferential direction was asymmetry at the front-end area of guide vanes, but it becomes uniform at the end of guide vane. The bearing pressure on the pressure side of the model 2 is lower, and the pressure distribution of model 1 is more asymmetry and there is a clear low pressure area at outlet of blade; Cavitation performance of model 2 is better, and the maximum efficiency is also the highest, but the hump is more serious; Model 1 has a widest area of high effective area.
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Dissertations / Theses on the topic "Low specific speed pump"

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Wettermark, Susan Daly. "Modeling flow characteristics of a low specific-speed centrifugal pump with different volute shapes." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/128340.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, June, 2019
Cataloged from the official PDF of thesis.
Includes bibliographical references (page 39).
A centrifugal pump is typically designed for a specific operating condition. The pump's shape and size are fine-tuned so that it can produce a specified output pressure and flow rate at the maximum possible efficiency. When a pump begins operating off of its design flow rate, its efficiency drops. Pumping systems often involve dynamic demands. They may have a fluctuating flow rate demand throughout the day, or the system may evolve and change size over time. In these cases, pumps with a single operating point are inefficient and insufficient. This thesis assesses the effects of changing a pump's volute casing geometry on the volute's internal flow characteristics. All analysis is performed on a low-specific-speed, radial flow centrifugal pump. 2D flow models from literature and CFD are analyzed and compared to experimental data. With properly-chosen solution methods, a 2D CFD simulation is found to match well with experimental results. Efficiency estimates and life-cycle cost changes due to changing flow characteristics in the variable volute system are presented.
by Susan Daly Wettermark.
S.B.
S.B. Massachusetts Institute of Technology, Department of Mechanical Engineering
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Sandler, Scott B. (Scott Bradley). "Experimental determination of volute effects on the stability of low specific speed centrifugal pumps." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/42539.

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Limbach, Phillip [Verfasser]. "Numerical 3D simulation of unsteady cavitating flow in low specific speed centrifugal pumps and analysis of the NPSH characteristics and void structures / Phillip Limbach." Aachen : Shaker, 2019. http://d-nb.info/1188551779/34.

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Moravec, Prokop. "Shape Optimization of the Hydraulic Machine Flow Passages." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-433572.

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

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Thornton, Warren Elliott. "A low specific speed, multistage, turbo-compressor for microturbine fuelling." Thesis, Imperial College London, 2006. http://hdl.handle.net/10044/1/11930.

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Vine, Andrew. "The aerodynamic design and evaluation of a low specific speed turbo compressor." Thesis, Imperial College London, 2006. http://hdl.handle.net/10044/1/11946.

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Miller, Annesley John. "The computer simulation of a low-speed, low specific performance, spark ignition, two-stroke cycle engine." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357450.

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Myers, Breanna. "Effects of Ingesting Fat Free and Low Fat Chocolate Milk After Resistance Training on Exercise Performance." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3620.

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Collegiate athletes are always looking for ways to improve their performance. Resistance training has been incorporated into most collegiate athletic programs for this very reason. In order to improve strength, lean body mass, and exercise performance, resistance exercise and timely protein ingestion must be followed. Incorporating protein ingestion into a resistance training routine has been shown to improve net protein balance. Milk protein is gaining popularity as an ergogenic aid. There has been growing interest in the potential use of bovine milk (cow’s milk) as an exercise beverage, especially during recovery from resistance training and endurance sports. No studies have been conducted comparing fat free chocolate milk and low fat chocolate milk on muscular strength and body composition in collegiate softball players. The purpose of the present study was to investigate whether fat free chocolate milk and low fat chocolate milk ingested after resistance exercise improves common performance assessments of collegiate softball players. Specifically, the performance assessments were the vertical jump test, 20-yard sprint, and the agility t-test. The participants were randomized according to strength and bodyweight, in a double blind experimental design. The 18 female, collegiate softball players (18.5 ± .7 yrs; 65.7 ± 1.8 inches; 156.2 ± 21.6 kg) ingested either fat free chocolate milk or low fat chocolate milk immediately after resistance exercise workouts for an 8-week period. Dependent variables included vertical jump test, 20-yard sprint test and agility t-test. The data was analyzed via a paired samples t-test (to detect difference across both groups over the eight week training period) and an independent samples t-test (to detect differences between the groups) using SPSS for Windows 15.0. No statistically significant differences were found in the vertical jump, 20 yard sprint, or agility t-test between the fat free chocolate milk group and the low fat chocolate milk group. The major, statistical, finding of this study is that the consumption of commercially available fat free chocolate milk versus low fat chocolate milk drink does not produce improvements in exercise performance in conjunction with an eight week periodized, resistance training program in collegiate softball players. The difference of 10 grams of fat (two servings per container) did not alter any of the performance variables (20 yard sprint, vertical jump or agility t-test).
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Holub, Jiří. "Rychloběžná vodní turbína." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230046.

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The aim of this thesis is to design a geometry of runner of high specific speed turbine which is supposed to provide the maximum flow rate of the turbine while achieving a relatively high hydraulic efficiency. New design is based on the analysis of the hydraulic characteristics of three previous design sof very hiát specific speed turbines. The actual hydraulic pdesign of the turbine runner is based on CFD computations. Special software tools like BladeGen and TurboGrid were used for petting up the geometry and mesh for the very first time at Kaplan Department of Fluid Engineering.
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Books on the topic "Low specific speed pump"

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Sandler, Scott B. Experimental determination of volute effects on the stability of low specific speed centrifugal pumps. Cambridge, Mass: Gas Turbine Laboratory, Massachusetts Institute of Technology, 1992.

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Center, Lewis Research, ed. Hydrogen test of a small, low specific speed centrifugal pump stage. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1991.

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Miller, Annesley John. The computer simulation of a low speed, low specific performance, spark ignition, two-stroke cycle engine. 1986.

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Book chapters on the topic "Low specific speed pump"

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Guo, Pengcheng, Xingqi Luo, Jinglin Lu, and Xiaobo Zheng. "Numerical Investigation on Impeller-Volute Interaction In a Low Specific Speed Centrifugal Pump with Tongue Profile Variation." In Fluid Machinery and Fluid Mechanics, 310–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89749-1_48.

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Hati, Manas Kumar, and Tarun Kanti Bhattacharyya. "A High Speed, Low Jitter and Fast Acquisition CMOS Phase Frequency Detector for Charge Pump PLL." In Progress in VLSI Design and Test, 166–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31494-0_19.

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Liu, Xudong, Pengjie Li, Peipei Dong, Guoqiang Xu, and Minghui Wang. "Low-speed Sensorless Control Method of SPMSM for Oil Pump Based on Improved Pulsating High-Frequency Voltage Injection." In The Proceedings of the 9th Frontier Academic Forum of Electrical Engineering, 691–703. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6609-1_63.

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Ali, Sanzida Tasmin, Pallabi Borah, and Sadhan Mahapatra. "Site-Specific Design Optimization of Wind Turbines at Low Wind Speed Sites of North-East India." In Advances in Sustainability Science and Technology, 179–87. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8700-9_17.

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Chatterjee, Krishnendu, Amir Kafshdar Goharshady, Rasmus Ibsen-Jensen, and Andreas Pavlogiannis. "Optimal and Perfectly Parallel Algorithms for On-demand Data-Flow Analysis." In Programming Languages and Systems, 112–40. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44914-8_5.

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AbstractInterprocedural data-flow analyses form an expressive and useful paradigm of numerous static analysis applications, such as live variables analysis, alias analysis and null pointers analysis. The most widely-used framework for interprocedural data-flow analysis is IFDS, which encompasses distributive data-flow functions over a finite domain. On-demand data-flow analyses restrict the focus of the analysis on specific program locations and data facts. This setting provides a natural split between (i) an offline (or preprocessing) phase, where the program is partially analyzed and analysis summaries are created, and (ii) an online (or query) phase, where analysis queries arrive on demand and the summaries are used to speed up answering queries.In this work, we consider on-demand IFDS analyses where the queries concern program locations of the same procedure (aka same-context queries). We exploit the fact that flow graphs of programs have low treewidth to develop faster algorithms that are space and time optimal for many common data-flow analyses, in both the preprocessing and the query phase. We also use treewidth to develop query solutions that are embarrassingly parallelizable, i.e. the total work for answering each query is split to a number of threads such that each thread performs only a constant amount of work. Finally, we implement a static analyzer based on our algorithms, and perform a series of on-demand analysis experiments on standard benchmarks. Our experimental results show a drastic speed-up of the queries after only a lightweight preprocessing phase, which significantly outperforms existing techniques.
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Pelegrí, Marc, Jordi Armengol, Josep González, Toni Pujol, Lino Montoro, and Pere Tubert. "Evaluation of the front leakage flow in a low-specific-speed centrifugal pump." In Environmental Hydraulics - Theoretical, Experimental and Computational Solutions, 273–75. CRC Press, 2009. http://dx.doi.org/10.1201/b10999-68.

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Arjeneh, M., K. R. Pullen, and S. Etemad. "Experimental study of radial low specific speed turbocompressor running in reverse as turboexpander." In 8th International Conference on Compressors and their Systems, 511–22. Elsevier, 2013. http://dx.doi.org/10.1533/9781782421702.9.511.

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Perry, Steven F., Markus Lambertz, and Anke Schmitz. "Respiratory faculties of amphibious and terrestrial craniotes." In Respiratory Biology of Animals, 139–63. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780199238460.003.0012.

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This chapter introduces the ‘who has what’ in terms of air-breathing respiratory faculties for craniotes. Air breathing has arisen independently dozens of times among ray-finned fishes, but none has become completely terrestrial. The lobe-finned fishes eventually gave rise to amphibians and amniotes, and we see an increased importance of primarily lung-based air breathing. A muscular mechanism for lung ventilation (a buccal pump in amphibians and primarily a negative pressure aspiration mechanism in amniotes), pulmonary veins that return oxygenated blood to the heart, and some mechanism for partial or complete separation of oxygenated and deoxygenated blood masses at the heart are seen. Each major tetrapod group, in fact, has its own specific breathing mechanism. The chapter examines in some detail low-performance and high-performance faculties, the latter being particularly realized in the diaphragm-powered, ventilated pool system of the mammalian bronchoalveolar lung, and in the cross-current system of the avian lung–air sac system.
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Jaglan, Naveen, Samir Dev Gupta, Binod Kumar Kanaujia, and Shweta Srivastava. "Developments in Efficient Antenna Designs Using EBG Structures." In Advances in Wireless Technologies and Telecommunication, 34–84. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0773-4.ch002.

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Since 2002, when the Federal Communication Commission (FCC) released the bandwidth 3.1-10.6 GHz, there has been increasing interest in the use of UWB systems because of their low power consumption, low cost, precise positioning and promising candidate for short-range high-speed indoor data communications. Planar circular monopoles like designs are a good example for UWB applications due to their merits such as ease of fabrication, Acceptable radiation pattern, and large impedance bandwidth. However, some narrowband systems also operate in this frequency like WiMAX, WLAN and X-Band satellite downlink communication band etc. cause interference in UWB range. To overcome any interference with these systems it is desirable to design UWB antenna with band notches. However, most techniques of obtaining notches uses antenna design specific approaches therefore EBG structures can be used to obtain single and multi-notch antennas. The technique used for obtaining notches using EBG is antenna design independent and can be applied to most of the antennas without compromising antenna performance.
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Ye, X. W., T. Jin, and P. Y. Chen. "Application of Computer Vision Technology to Structural Health Monitoring of Engineering Structures." In Optoelectronics in Machine Vision-Based Theories and Applications, 256–68. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5751-7.ch009.

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The computer vision technology has gained great advances and applied in a variety of industry fields. It has some unique advantages over the traditional technologies such as high speed, high accuracy, low noise, anti-electromagnetic interference, etc. In the last decade, the technology of computer vision has been widely employed in the field of structure health monitoring (SHM). Many specific hardware and algorithms have been developed to meet different kinds of monitoring demands. This chapter presents three application scenarios of computer vision technology for health monitoring of engineering structures, including bridge inspection and evaluation with unmanned aerial vehicle (UAV), recognition and surveillance of foreign object intrusion for railway system, and identification and tracking of concrete cracking. The principles and procedures of three application scenarios are addressed following with the experimental study, and the possibilities and ideas for the application of computer vision technology to other monitoring items are also discussed.
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Conference papers on the topic "Low specific speed pump"

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Kagawa, Shusaku, and Junichi Kurokawa. "New Centrifugal Pump in Very Low Specific Speed Range." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-06018.

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In the range of very low specific speed, such as ns < 80 [min.−1, m3/min., m], or Ns < 533 [min.−1, USGPM, ft.], stable head-capacity curve is one of the most important issues. The head-capacity curve of a conventional closed impeller tends to be unstable with a positive slope characteristic in such a very low ns range. To solve this problem, a new type of centrifugal pump “J-groove pump” is proposed and tested in this study. The J-groove pump is composed of a rotating disk mounted with many shallow radial grooves and a circular casing. The experimental results reveal that the proposed J-groove pump is quite effective in the very low specific speed range. The pump head is about 1.2 times higher than that of a conventional centrifugal pump and the head-capacity curve is almost stable, though the efficiency becomes a little lower because of a large friction power of the stationary wall. The cavitation performance is also measured and is shown to be almost same as that of a conventional centrifugal pump. This pump is applicable to high speed pump, as it has no small clearance, high strength due to simple impeller configuration, and easy to assemble. In order to determine the internal flow characteristics of the J-groove pump, CFD simulation is carried out. It is revealed that the high head of the J-groove pump is caused by a strong vortex flow existing in both clearances near the impeller tip over the whole flow range.
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Shi, Wei-dong, Fei Long, Yue Li, Hong-fei Leng, and Ping-ping Zou. "Non-Overload Design of Low Specific Speed Submersible Pump." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30368.

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Based on the design of low specific speed submersible pump, the influence of impeller geometrical parameter on shaft power of pump is analyzed in this paper. Under the condition of the maximum value of shaft power being no more than the input power of matching electromotor, the method of reducing the maximum value of pump power is researched further in order to reduce the power of the matching electromotor. Then the design correlation formula of the geometrical parameters of impeller is presented. The value of shaft power was predicted by the software FLUENT. The results show that the ratio of maximum power of pump to the power at designing condition is less than 1.2 when the correlation formula presented is used. The experimentation of prototype shows that the maximum value of shaft power of pump reduces greatly whilst every parameter meets the rated requirements. The results demonstrated the guiding role of the discriminated formula in practice, so the desired aim was achieved.
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Al-badawi, Muhamed, I. G. Adam, Sherif Haddara, and Ahmed H. M. El Sherif. "Influence of Blade Shape Geometry on Very Low Specific Speed Centrifugal Pump Performance." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87119.

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Direct or inverse design methods for centrifugal pumps play an important role in investigating their performance. In this paper, a very low specific speed centrifugal pump impeller of ns = 9.5 (metric), three blades and 222° wrap angle. This pump was investigated using the direct design method to achieve the blade shape geometry and examine the blade angle distribution. As the blade angle progression affects the pump performance, four models with different blade angle distribution were used to perform the hydrodynamic and suction performance of the pump. The linear and non-linear derived correlation models were designed firstly using ANSYS-BladeGen module then studied numerically using ANSYS-CFX module to solve the three-dimensional Navier-Stokes equations. Validation of the numerical simulation of the investigated centrifugal pump was done using experimental data. Numerical results show that the change in the blade angle distribution has an influence on the blade wrap angle. Consequently, the variation in the blade wrap angle affects the pump head and the relative velocity distribution. The pressure gradient varies in the pump with changing the blade length. Using the velocity streamline and the velocity vector, the eddies existence and distribution in the blade suction side affect the relative velocity distribution and the pump performance. It was found that the blade with the smallest length decreases the pump head and have best velocity distribution.
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Zhang, Jinfeng, Ye Yuan, Shouqi Yuan, Weigang Lu, and Jianping Yuan. "Experimental Studies on the Optimization Design of a Low Specific Speed Centrifugal Pump." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-22005.

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For a low specific speed centrifugal pump with the requirement of high efficiency of 68% and non-overload power characteristics, series experimental studies, by matching 9 volutes with 19 impellers were done. By combining the former research results about the splitters and the non-overload theory in centrifugal pump, the theoretical conditions to achieve the property of non-overload in a centrifugal pump with splitters was analyzed, and formulas to estimate the maximum shaft power and its position are derived. Based on the requirement of high efficiency and non-overload, blade outlet angle β2, blade outlet width b2, volute throat are Ft and the inlet diameter of splitters Di were chosen with three levels to design a normal L9 (34) orthogonal test scheme. After the optimized design scheme was determined, and corresponding test was done also, it demonstrates that the experiment purpose was achieved and the design method to combine the splitters and non-overload theory is reasonable, which can get the property of high efficiency and non-overload. A BP artificial neural network (BPANN) model was built to predict the efficiency and head of centrifugal pumps with splitters in MATLAB toolbox. Eighty five groups of test results were used to train and test the network model, where the Levenberg–Marquardt algorithm was adopted to train the neural network model. Five parameters Q, Z, β2, Di, b2 were chosen as the input layer parameters, η and H were the output factors. Through the analysis of prediction results, the conclusion was got that, the accuracy of the BP ANN is good enough for performance prediction. And the BP ANN can be used for assisting design of centrifugal pumps with splitters, which can shorten research time and cost.
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Zhang, Ning, Minguan Yang, Bo Gao, Zhong Li, and Dan Ni. "Investigation on Rotor-Stator Interaction in a Low Specific Speed Centrifugal Pump." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-33495.

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In centrifugal pump, due to intense rotor-stator interaction, high amplitude pressure pulsating would be induced, and it has a crucial influence on the stable operating of the pump. In this paper, a low specific speed centrifugal pump is investigated to illustrate unsteady flow within the centrifugal pump. Pressure pulsation signals are attained by mounting 20 monitoring points along the spiral volute, covering all the interested region of the model pump. FFT (Fast Fourier Transform algorithm) is applied to analyze the time-domain pressure signals. Results show that in pressure spectra, evident peaks at blade passing frequency fBPF together with its high harmonics can be identified, and the amplitudes are closely associated with operating conditions of the model pump and the positions of the monitoring points. At nominal flow rate, four vortical regions with high amplitude are captured inside the model pump. And the unsteady vortical structure at the near tongue region is related to the relative position of the impeller with respect to the tongue, and the upstream effect of the volute tongue significantly affects the vorticity distribution on the blade pressure side. At off-design conditions, the interaction pattern between the vortical structure and the volute tongue is significantly affected compared with that at the rated condition, as to the upstream effect of the tongue. At high flow rate, partial vortex would separate from the main vortex, but at low flow rate, the cutting and impingement effects of the tongue are much weaker due to almost all the vortex moving to the narrow side of the tongue. Based on the analysis of rotor-stator interaction in the model pump, some conclusions could be obtained. Pressure amplitudes at fBPF are associated with the positions of monitoring points and operating conditions of the model pump. Vorticity magnitude at blade exit increases as the impeller passes the volute tongue. And the fluid-dynamic blade-volute interaction is dominated by the vorticity shedding from blade trailing edge and their impingement on the volute tongue with subsequent cutting and distortion. And high pressure amplitude is generated with the corresponding high vorticity magnitude observed. So the intense interaction between flow structures (jet-wake pattern) and volute tongue is crucial to unsteady pressure pulsation. Thus, to lower pressure pulsation amplitude and fluid dynamic forces, controlling the vortical structure at blade trailing edge is an effective method.
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Lu, Chang-Shen, Zheng-Gui Li, Xin-rui Li, Xin Chai, Xiao-bing Liu, Chuan-Qi Ou, Dan Yao, Biao Ma, and Wei-Jun Wang. "Numerical Analysis of Cavitation Flow in Low Specific Speed Condensate Pump Impeller." In 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia). IEEE, 2019. http://dx.doi.org/10.1109/isgt-asia.2019.8881723.

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Vermunt, E. M. A., K. A. J. Bruurs, M. S. van der Schoot, and B. P. M. van Esch. "Part Load Instability and Rotating Stall in a Multistage Low Specific Speed Pump." In ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20086.

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Abstract A new diffuser design is developed for a low specific speed, multistage pump. In this design the diffuser and the de-swirl vanes are integrated into single vanes. This creates diffuser channels that extend from behind the impeller exit through the cross-over, up to the eye of the next stage impeller. Experiments show the occurrence of a saddle type instability in the head curve. At a critical flow rate of close to 50% of the flow rate at Best Efficiency Point (BEP), the head drops by 7% of the head at BEP. In this study Computational Fluid Dynamics (CFD) are used in an effort to understand the underlying flow phenomena. The head curve that is obtained with the transient CFD simulations contains a saddle type instability at a flow rate that is approximately the same as in the experiments, but with a lower magnitude. At flow rates higher than the critical flow rate, the predicted head and power are in very good agreement with the experimental data. At flow rates lower than the critical flow rate, the head and power are slightly over-predicted. An analysis of the pressure distribution in the pump reveals that the head loss at different flow rates in the diffuser shows a discontinuity at the critical flow rate. Since both the impeller head and the head loss in the vaneless gap increase continuously for decreasing flow rate, this is an indication that the cause of the head instability lies in the diffuser. Moreover, a strong increase in the variability of head and power at flow rates below the critical flow suggests that the phenomenon is unsteady. Flow patterns in the impeller and in the diffuser, as calculated by CFD, show a high degree of periodicity and are very similar for flow rates down to the critical flow rate. However, for lower flow rates the flow pattern changes completely. A single rotating stall cell is observed that causes two or three neighboring diffuser channels to stall, leading to a significantly lower flow rate or even a reversed flow. This stall pattern rotates in the direction of impeller rotation at a very low frequency of approximately 3.3% of the impeller rotation frequency.
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Boncinelli, Paolo, Roberto Biagi, Antonio Focacci, Umberto Corradini, Andrea Arnone, Marco Bernacca, and Massimiliano Borghetti. "Bowl-Type Diffusers for Low Specific-Speed Pumps: An Industrial Application." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95248.

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In this paper, the aerodynamic design of a bowl–type diffuser for a low specific–speed pump is presented and described in detail. The main goal was to achieve an optimal configuration in terms of diffuser recovery capacity and stage aerodynamic efficiency, while satisfying severe constraints concerning stage size and multistage feasibility. Both geometrical parametrization tools and a fully–viscous three–dimensional numerical solver were exploited in the design process. The geometrical parameterization allowed one to control and modify the geometry of the component by changing a limited number of parameters. CFD analysis was exploited to assess the effectiveness of the geometrical modifications on the performance, and to identify critical problems. A number of aerodynamic ID coefficients with simple physical meanings were also introduced and used as a support to the design to synthesize the main feature of the strongly three–dimensional flow evolving in the component. As a result, a new stage configuration was developed according to the imposed constraints, whose performance is at the same level as standard pumps of the same class.
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Busby, Judy, Bill Batton, Raymond Furst, and Ashvin Hosangadi. "High Suction Specific Speed LOX Pump: Design, Analysis and Testing." In 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4947.

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van der Schoot, Martijn, Kevin Bruurs, and Eric van der Zijden. "CFD-Based Hydraulic Design and Manufacturing of a Multistage Low Specific-Speed Diffuser Pump." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5661.

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Abstract A multistage low specific-speed diffuser pump was designed to achieve very good hydraulic performance with a newly designed integrated diffuser, crossover and return guide vane. The diffuser was designed using a continuous crossover design. The design space of this diffuser was limited because of the usage of a mechanical pump design from a similar existing pump. This paper presents the simulation-based design of this new pump and the role that simulation can play in the manufacturing process. A new diffuser has been designed to obtain optimum efficiency and to ensure that the pump will operate most of its time very close its best efficiency point. The new diffuser was designed using an approach where the diffuser vane was stretched to completely cover the area starting just behind the impeller trailing edge towards the eye of the next stage impeller. This means that the diffuser vanes should now convert velocity into pressure, guide the fluid to the next stage impeller eye while reducing the swirl and uniformizing the flow. The shape of the diffuser has been optimized using response surfaces that were created using Computation Fluid Dynamics (CFD). This way, a diffuser with a minimum amount of losses was obtained, due to smooth and gradual area changes of the waterway. The final design incorporating this diffuser was analyzed using steady-state CFD to create the full performance curve. The design was transferred into a real physical product by manufacturing it. The resulting casting of the diffuser component was scanned using a 3D scanner. The 3D model of the scan was used to make a comparison using CFD between the performance of the designed and the manufactured diffuser. This provided understanding in how deviations due to the manufacturing process influence the performance. Finally, the complete pump underwent a performance test and its results closely matched the performance as calculated using CFD.
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Reports on the topic "Low specific speed pump"

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Adsit, Sarah E., Theodora Konstantinou, Konstantina Gkritza, and Jon D. Fricker. Public Acceptance of INDOT’s Traffic Engineering Treatments and Services. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317280.

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As a public agency, interacting with and understanding the public’s perspective regarding agency activities is an important endeavor for the Indiana Department of Transportation (INDOT). Although INDOT conducts a biennial customer satisfaction survey, it is occasionally necessary to capture public perception regarding more specific aspects of INDOT’s activities. In particular, INDOT needs an effective way to measure and track public opinions and awareness or understanding of a select set of its traffic engineering practices. To evaluate public acceptance of specific INDOT traffic engineering activities, a survey consisting of 1.000 adults residing within the State of Indiana was conducted. The survey population was representative in terms of age and gender of the state as of the 2010 U.S. Census. The survey was administered during the months of July and August 2020. Public awareness regarding emerging treatments not currently implemented in Indiana is low and opposition to the same new technologies is prominent. Older or female drivers are less likely to be aware of emerging treatments, and older drivers are more likely to oppose potential implementation of these treatments. Although roundabouts are commonplace in Indiana, multi-lane roundabouts remain controversial among the public. Regarding maintenance and protection of traffic during work zones and considering full or partial roadway closure, public preference is for partial closure; this preference is stronger in rural areas. The public equally agrees and disagrees that INDOT minimizes construction related traffic delays. Approximately 76% of Indiana drivers believe themselves to above average drivers, while an additional 23% believe themselves to be average. Driver perceptions of average highway speeds speed are not aligned with posted speed limit as the perceived average speed on Indiana’s urban freeways and rural and urban state highways is considerably higher than the actual speed limit.
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