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Relevant bibliographies by topics / Suction Specific Speed Nss

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Academic literature on the topic 'Suction Specific Speed Nss'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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Journal articles on the topic "Suction Specific Speed Nss"

1

Kareem Sakran, Hayder. "A Numerical Investigation of the Effect of Increasing Blade Numbers on Cavitation and Performance of Centrifugal Pumps at Constant Parameters." University of Thi-Qar Journal for Engineering Sciences 8, no. 3 (2017): 1–19. http://dx.doi.org/10.31663/utjes.v8i3.89.

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In the present paper, a numerical study has been investigated by using computational fluid dynamics (CFD) to analyze pressure, head, head coefficient, pressure coefficient, input power, and volume fraction of cavitation at three cases of simulation in which each one has constant parameters; however, with modifying number of blades which is changed from five to sixteen. The constant parameters are rotating speed, volume flow rate, mass flow rate, outlet diameter, suction specific speed Nss, Reynolds number and NPSHr. These parameters have been fixed to have the same conditions for each case. Th

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Li, Hong, Zhenhua Shen, Nicholas Engen Pedersen, and Christian Brix Jacobsen. "Experimental and unsteady numerical research of a high-specific-speed pump for part-load cavitation instability." Advances in Mechanical Engineering 11, no. 3 (2019): 168781401982893. http://dx.doi.org/10.1177/1687814019828932.

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Net positive suction head peak is a well-known cavitation instability phenomenon in high-specific-speed pumps. Both non-cavitating performance and cavitating performance of a high-specific-speed pump were investigated by experiments and numerical simulations. According to the cavitating performance results, net positive suction head peak is found at 80% of nominal flow. The head curves of non-cavitating performance also have saddle-type instabilities near 70%–80% of nominal flow. Water vapor volume fraction distributions show that cavitation region at net positive suction head peak flow only c

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3

YOSHIDA, Yoshiki. "G405 A Consideration of Inducer's Specific Speed from an Aspect of Impeller's Suction Specific Speed." Proceedings of the Fluids engineering conference 2007 (2007): _G405–1_—_G405–4_. http://dx.doi.org/10.1299/jsmefed.2007._g405-1_.

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YOSHIDA, Yoshiki. "G405 A Consideration of Inducer's Specific Speed from an Aspect of Impeller's Suction Specific Speed." Proceedings of the Fluids engineering conference 2007 (2007): _G405—a_. http://dx.doi.org/10.1299/jsmefed.2007._g405-a_.

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Cao, Weidong, Zhixiang Jia, and Qiqi Zhang. "Near-Wall Flow Characteristics of a Centrifugal Impeller with Low Specific Speed." Processes 7, no. 8 (2019): 514. http://dx.doi.org/10.3390/pr7080514.

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In order to study the near-wall region flow characteristics in a low-specific-speed centrifugal impeller, based on ANSYS-CFX 15.0 software, Reynolds averaged Navier-Stokes (RANS) methods and renormalization group (RNG) k-ɛ turbulence model were used to simulate the whole flow field of a low specific speed centrifugal pump with five blades under different flow rates. Simulation results of external characteristics of the pump were in good agreement with experimental results. Profiles were set on the pressure side and suction side of impeller blades at the distances of 0.5 mm and 2 mm, respective

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Mosshammer, Markus, Helmut Benigni, Helmut Jaberg, and Juergen Konrad. "Maximum Efficiency Despite Lowest Specific Speed—Simulation and Optimisation of a Side Channel Pump." International Journal of Turbomachinery, Propulsion and Power 4, no. 2 (2019): 6. http://dx.doi.org/10.3390/ijtpp4020006.

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Side channel pumps provide high pressure at relatively low flow rates. This comes along with a quite low specific speed and thus with the known disadvantage of a quite poor maximum efficiency. This paper describes the detailed analysis and optimisation of a typical 1-stage side channel pump with an additional radial suction impeller by means of computational fluid dynamics (CFD) simulations. In a first step, the model was successively generated and it was obvious that it has to contain all details including suction impeller and main stage (both 360° models) as well as the pressure housing and

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Wang, Cong, Yongxue Zhang, Zhiwei Li, Ao Xu, Chang Xu, and Zhicheng Shi. "Pressure fluctuation–vortex interaction in an ultra-low specific-speed centrifugal pump." Journal of Low Frequency Noise, Vibration and Active Control 38, no. 2 (2018): 527–43. http://dx.doi.org/10.1177/1461348418817697.

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To provide a comprehensive understanding of the pressure fluctuation–vortex interaction in non-cavitation and cavitation flow, in this article, the unsteady flow in an ultra-low specific-speed centrifugal pump was investigated by numerical simulation. The uncertainty of the numerical framework with three sets of successively refined mesh was verified and validated by a level of 1% of the experimental results. Then, the unsteady results indicate that the features of the internal flow and the pressure fluctuation were accurately captured in accordance with the closed-loop experimental results. T

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Friedrich, Martin G., Ioannes Bougioukas, Peter Wenig, Steffen Vormfelde, and Theodor Tirilomis. "New device for intraoperative blood suction avoiding turbulences." BMJ Innovations 4, no. 2 (2018): 91–97. http://dx.doi.org/10.1136/bmjinnov-2017-000201.

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IntroductionBleeding during surgery is common. Increased bleeding may disturb procedure, induces haemodynamic instability and results in need for blood transfusion. Allogenic blood transfusions increase mortality and morbidity, especially risk of infections, pulmonary and renal complications, as well as thromboembolic events. Autotransfusion is in many cases a solution but forced suction may destroy or alter blood cells because of turbulences, shear forces and contact of the blood to extrinsic surfaces. The aim of the study was the analysis of turbulence profile and development of a new suctio

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Wang, Zhe, Ruizhi Zhang, Jiajian Zhou, and Xianwu Luo. "Cavitating flow investigation in low specific speed axial flow waterjet pumps." Journal of Physics: Conference Series 2217, no. 1 (2022): 012008. http://dx.doi.org/10.1088/1742-6596/2217/1/012008.

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Abstract In this paper, the cavitating flow in low specific speed axial flow waterjet pumps are treated at different cavitation conditions. In order to analyze the cavitating turbulent flow comprehensively, three axial flow waterjet pumps with the specific speed less than 650 min-1·m3s-1·m are chosen to compare the internal flow phenomenon. The investigations are conducted by numerical simulation, where RANS method is applied with k-ω SST turbulence model and homogeneous cavitation model. The results show that there are several types of cavitation such as tip leakage vortex cavitation, sheet c

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Calgaro, Marcelo, Adroaldo Dias Robaina, and Márcia Xavier Peiter. "CURVAS DE DESEMPENHO OPERACIONAL DE BOMBAS CENTRÍFUGAS DETERMINADAS A PARTIR DAS CARACTERÍSTICAS FÍSICAS DO ROTOR I - VALORES NOMINAIS." IRRIGA 9, no. 1 (2004): 19–30. http://dx.doi.org/10.15809/irriga.2004v9n1p19-30.

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CURVAS DE DESEMPENHO OPERACIONAL DE BOMBAS CENTRÍFUGAS DETERMINADAS A PARTIR DAS CARACTERÍSTICAS FÍSICAS DO ROTORI - VALORES NOMINAIS Marcelo Calgaro1; Adroaldo Dias Robaina1; Márcia Xavier Peiter21Departamento de Engenharia Rural, Universidade Federal de Santa Maria, Santa Maria, RS, calgaro@mail.ufsm.br2Curso de Engenharia Agrícola, Universidade Regional Integrada do Alto Uruguai e das Missões – URI, Santiago, RS. 1 RESUMO Este trabalho teve como objetivo desenvolver uma metodologia com a finalidade de determinar os valores nominais da vazão, altura manométrica, rendimento, potência requerid

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Book chapters on the topic "Suction Specific Speed Nss"

1

Europump. "Suction specific speed." In NPSH for Rotodynamic Pumps. Elsevier, 1999. http://dx.doi.org/10.1016/b978-185617356-8/50021-3.

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Jones, Garr M. "Suction Specific Speed." In Pumping Station Design. Elsevier, 2008. http://dx.doi.org/10.1016/b978-185617513-5.50043-3.

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Li, Wei, Leilei Ji, Ramesh Agarwal, Weidong Shi, and Ling Zhou. "Introduction." In Mixed-flow Pumps: Modeling, Simulation, and Measurements. ASME-Wiley, 2024. http://dx.doi.org/10.1115/1.862mfp_ch1.

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A mixed-flow pump is a centrifugal pump with a mixed-flow impeller [1]. The specific speed (ns) lies between 35 and 80 rpm for low-speed mixed-flow pumps and between 80 and 160 rpm for higher-speed mixed-flow pumps (in special cases, even higher). It has characteristics of both radial flow and axial flow pumps. As liquid flows through the impeller of a mixed-flow pump, the impeller blades push the liquid out away from the pump shaft and to the pump suction at an angle greater than 90°. The impeller of a typical mixed-flow pump and the flow through a mixed-flow pump are shown in Fig. 1.1.

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Conference papers on the topic "Suction Specific Speed Nss"

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Hosangadi, Ashvin, Vineet Ahuja, and Ronald J. Ungewitter. "Generalized Numerical Framework for Cavitation in Inducers." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45408.

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In this paper we present a capability to predict pump performance in cavitating flow regimes. Simulations of cavitating flowfields in a single-stage inducer type pump have been carried out. The pump used in this paper is the Simplex inducer geometry that has been extensively tested at NASA Marshall. We follow our turbomachinery simulations up with an extension of our cavitation model to cryogenic flow regimes, where temperature effects begin to play a significant role. Our framework encompasses an acoustically accurate, compressible multiphase model that has been previously validated. The mode

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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. American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4947.

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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 corre

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Shim, Hyeon-Seok, and Kwang-Yong Kim. "EFFECTS OF MERIDIONAL SHAPE ON HYDRAULIC AND SUCTION PERFORMANCE OF A HIGH SPECIFIC SPEED CENTRIFUGAL PUMP." In 3rd Thermal and Fluids Engineering Conference (TFEC). Begellhouse, 2018. http://dx.doi.org/10.1615/tfec2018.cmd.021436.

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Shen, Zhenhua, Nicholas Pedersen, Hong Li, Christian Brix Jacobsen, and Xiaofen Ma. "Part-Load Cavitation Instability Investigation of a High Specific Speed Pump." In ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fedsm2017-69159.

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Cavitation instability in pump part-load condition is an ongoing subject of research due to erosion and noise. For some high specific speed (nq) pumps, NPSH3%-peak at part-load represents one of the cavitation instabilities. This paper describes the recent investigations and results on performance and cavitation instabilities of a high nq pump. An nq 99 impeller that shows a NPSH3%-peak at 70% of nominal flow rate is investigated by using numerical calculations and experiments. Both experimental and numerical results show that the head curves also have instability phenomenon near 70–80% of nom

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Tsugawa, Takuji. "The Same Initial Condition of the Optimum Method for All Specifications." In ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7518.

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In the previous study (AJK2015-09034 A meridian profile obtained by no restriction in optimum process), an optimum meridian profile of impeller and guidevane by no restriction was obtained. In case of no restriction, all the design parameters and specifications are variable optimum parameters. As the result, the combination of the best design parameters and specifications were selected. In optimum process, blade number, outlet impeller mid span diameter, rotational speed of impeller and specific speed were also variable optimum parameters. As the variable design parameters need to change gradu

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Tsugawa, Takuji. "Meridian Profile Case Study of the Best Specific Speed and Blade Number." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21030.

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In the previous case study of optimum meridian profile of impeller and guidevane, the specific speed was the constant design specification. In this case study, the meridian profiles of optimum specific speed were studied. So, the specific speed is the variable design parameter. The impeller blade number and the guidevane blade number are also the variable design parameters. As the variable design parameters need to change gradually, the blade number is used as real number in the optimum process. In condition of the initial specific speed 1000, initial impeller blade number 2 and initial guidev

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Iandoli, Carmine Luca, and Enrico Sciubba. "Entropy Generation Maps of a Low-Specific Speed Radial Compressor Rotor." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1358.

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Abstract The flow field in the rotor of a low-specific speed radial compressor is computed in a fully 3-D simulation and the irreversible entropy generation rates directly calculated from the local velocity- and temperature values. The code used for the simulation is a commercial CFD-finite volumes package, FLUENT™, augmented by an novel entropy generation routine adapted from the original formulation due to Bejan [1]. The model provides the designer with exact and detailed knowledge of the local values of the irreversibility production, allowing for a separate accounting of viscous- and therm

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Ali, Azfar, and Kun Jia. "A Study on Eliminating Dip in Head Curve of High Specific Speed Pumps." In ASME 2024 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2024. https://doi.org/10.1115/imece2024-135936.

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Abstract High specific speed pumps often exhibit unstable head-characteristics at low volumetric flow rates, with a dip or positive slope in the head-curve occurring typically between 50 to 65 percent of the BEP flow rate. This results in a limited operating range for the pump. Furthermore, these pumps usually have a high rise to shut-off in terms of head and power. This study is aimed to eliminate these instabilities in the head curve and develop methods to design VCT pumps with a wider operating range of flow rates and lower shut off power without compromising efficiency. In this study, firs

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Reinke, Peter, Adrian Rienaecker, Marcus Schmidt, and Tom Beckmann. "Digital High-Speed Photography of Cavitation in Journal Bearings." In 2023 JSAE/SAE Powertrains, Energy and Lubricants International Meeting. Society of Automotive Engineers of Japan, 2023. http://dx.doi.org/10.4271/2023-32-0163.

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<div class="section abstract"><div class="htmlview paragraph">This paper presents current research comparing gaseous and vaporous cavitation in lubricant flows obtained by means of digital high-speed photography in un-precedented detail. Hydrodynamic journal bearings are compact and guarantee a nearly wear- resistant operation. These features make journal bearings the first choice for many applications. However, under particular operational conditions, e.g. a highly dynamic load, cavitation can occur which can lead to bearing failures. For the selected case of suction cavitation th

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Reports on the topic "Suction Specific Speed Nss"

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Robinett, Fred. PR-471-16206-R01 Suction Piping Effect on Pump Performance Testing. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011577.

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Pump suction piping testing was performed to measure the influence on pump performance and mechanical operation, and also provide a benchmark for comparing, verifying and improving CFD modeling techniques. Testing was performed in Sulzer's pump test laboratory, in Winterthur Switzerland, using a single stage double suction model pump a with similar specific speed and design as used in many crude oil pipeline installations. Testing included a baseline test with a straight pipe with a flow straightener at the pump suction and two arrangements with pipe elbows directly at the pump suction. All te

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