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Journal articles on the topic 'Double suction pumps'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Tao, Ran, Ruofu Xiao, Di Zhu, and Fujun Wang. "Multi-objective optimization of double suction centrifugal pump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 6 (March 28, 2017): 1108–17. http://dx.doi.org/10.1177/0954406217699020.

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Double suction centrifugal pumps are widely used for water supplying system. In this study, the original design of a double centrifugal pump lacked sufficient head at the design flow rate condition. Therefore, the most important objective was to optimize the design to improve the head. A strategy inspired by “liquid–gas cavitation process” is innovatively used for intelligent global search of better pump designs with both higher head and wider-higher efficiency. This strategy has advantages including flexibility, parallelism, and feasibility on overstepping the local-best. The computational fluid dynamics and artificial neural network are used. It helps this optimization to find unknown points in the non-linear and multi-dimensional searching space, and accelerate the optimization process. Candidates were found after search, and the best one was chosen using Pareto principle. Experimental and numerical studies verify that the optimized impeller meets the requirement of head. The efficiency is also significantly improved with higher best efficiency and wider high efficiency range than original design. The critical cavitation is also improved at design condition. This study provides an effective strategy and a good solution for multi-objective optimization of double suction centrifugal pumps. Moreover, this study provides references for the combination of optimizations with artificial intelligence especially in the pump’s design.

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2

Liu, Mei Qing, Qiu Wei Li, Yao Hua Bai, Zhi Yong Liu, and Pei Jie He. "Efficiency and Pressure Pulsation Analysis of a Double Suction Centrifugal Pump with Different Arrangement Impellers." Advanced Materials Research 433-440 (January 2012): 709–15. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.709.

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Double suction centrifugal pumps are widely employed in large water supply projects. In the present study, a double suction centrifugal pump with the staggered arrangement impeller in a domestic water supply project has been mapping and modeling, and then the symmetrical arrangement impeller of a double suction centrifugal pump has been designed for comparison. The commercial code was used to investigate the pump efficiency and the time variation of pressure at the zone of volute tongue. This unsteady flow feature was investigated by the large eddy simulation (LES) method with the sliding mesh technology. The analysis indicated that the pump efficiency of the double suction centrifugal pump with staggered arrangement impeller is lower than that with the symmetrical one. The frequency of pressure pulsation at the volute tongue is consistent with the blade passing frequency. The staggered arrangement impeller can reduce the levels of pressure pulsation significantly.

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3

Wang, Osman, Pei, Gan, and Yin. "Artificial Neural Networks Approach for a Multi-Objective Cavitation Optimization Design in a Double-Suction Centrifugal Pump." Processes 7, no. 5 (April 27, 2019): 246. http://dx.doi.org/10.3390/pr7050246.

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Double-suction centrifugal pumps are widely used in industrial and agricultural applications since their flow rate is twice that of single-suction pumps with the same impeller diameter. They usually run for longer, which makes them susceptible to cavitation, putting the downstream components at risk. A fast approach to predicting the Net Positive Suction Head required was applied to perform a multi-objective optimization on the double-suction centrifugal pump. An L32 (84) orthogonal array was designed to evaluate 8 geometrical parameters at 4 levels each. A two-layer feedforward neural network and genetic algorithm was applied to solve the multi-objective problem into pareto solutions. The results were validated by numerical simulation and compared to the original design. The suction performance was improved by 7.26%, 3.9%, 4.5% and 3.8% at flow conditions 0.6Qd, 0.8Qd, 1.0Qd and 1.2Qd respectively. The efficiency increased by 1.53% 1.0Qd and 1.1% at 0.8Qd. The streamline on the blade surface was improved and the vapor volume fraction of the optimized impeller was much smaller than that of the original impeller. This study established a fast approach to cavitation optimization and a parametric database for both hub and shroud blade angles for double suction centrifugal pump optimization design.

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4

Sekino, Yumiko, and Hiroyoshi Watanabe. "Design optimization of double-suction volute pumps." World Pumps 2016, no. 5 (May 2016): 32–35. http://dx.doi.org/10.1016/s0262-1762(16)30101-8.

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5

Tverdokhleb, Igor, Aleksandr Kostyuk, and Sergey Sokolov. "Influence of Operation Mode on Efficiency and Life Cycle Cost of Double Suction Pump." Applied Mechanics and Materials 630 (September 2014): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amm.630.147.

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The widely known fact that the parameters of many pumps are not correspond to systems characteristics which either changed in time or initially were evaluated incorrectly. In this report the main reasons of pumps operation beyond the operation range are presented. Influence of such operation on Life cycle cost. The real cases of inefficient and unreliable pump operation are presented in report. Also the results of retrofitting of pump station are presented.

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6

Kadhim, Ali Fakhri, and Hayder A. Al Thamiry. "Numerical Simulation to Investigate the Occurrence of Vortices at Double Vertical Pumps Intakes." Association of Arab Universities Journal of Engineering Sciences 28, no. 1 (March 31, 2021): 01–06. http://dx.doi.org/10.33261/jaaru.2021.28.1.001.

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The pumping station is widely used in our modern life. The occurrence of the vortex at pumpsump, which is causing air entering pipe intake, is a common problem in the design of pumps. Thisphenomenon, including surface and sub-surface vortex, may lead to damage to the pumping structure, highpower consumption, and loss in pump performance. In some requirements, the multiple suction pipes areusing to get the required flow. Due to this arrangement, the performance of the suction pipes will influence.This paper is aimed to investigate the occurrence of vortices around the flow pattern of two pumps by usingComputational Fluid Dynamic (CFD) code Fluent. This CFD model is based on solving Navier-Stockequations by finite volume method. The model of double suction pipes was investigated under five differentsubmergence depth (S) and five different suction velocities (v). The SST k-ω turbulence model was selectedfor the turbulence. The results showed that the air entering vortex does not appear when the submergencedepth (S) is equal or greater than 1.5 times from the diameter of the bellmouth for intake pipe (D). Thesurface vortex appeared obviously when the submergence depth (S) equals to 1.25D and the Froude numberat the bell is equal to or greater than 1.028, and appeared clearly when the (S/D=1) and Froude number isequal to or more than 0.77. The nearer attached wall vortex does not appear when the space from the centerof the suction pipe to the sidewall (C) equals 2 times of bell diameter.

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7

Song, Xijie, Dunzhe Qi, Lijuan Xu, Yubin Shen, Wei Wang, Zhengwei Wang, and Yan Liu. "Numerical Simulation Prediction of Erosion Characteristics in a Double-Suction Centrifugal Pump." Processes 9, no. 9 (August 24, 2021): 1483. http://dx.doi.org/10.3390/pr9091483.

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The double-suction centrifugal pumps installed along the Yellow River in China face serious sediment erosion due to the high sediment content which causes the poor operation efficiency of the pump units. The particle motion characteristics and erosion characteristics in a pump under different flow rates and different particle concentrations were numerically simulated based on the particle track model of solid-liquid two-phase flow. The results show that the flow rate has a significant effect on the particle tracks and the erosion caused by the particles in the impeller. The total erosion rate is positively correlated with the flow rate, and increases with the increase in flow rate. The vortex and secondary flow in the impeller have obvious influence on the particle trajectory, which increases the particle concentration at the trailing edge of the pressure surface and intensifies the impact erosion in this area. The particles carried by the vortex intensifies the local erosion. The particle concentration mainly affects the erosion rate, but has little effect on the erosion position. The influence of flow rate on pump erosion is greater than that of the particle properties. These results provide a reference for optimization of the design of anti-erosion blades of double-suction pumps and the regulation and operation of pumping stations.

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8

Liu, Wei, and Feng Lan Wang. "S Type Single-Stage Double Suction Centrifugal Pump in Vibration and Shaft Broken Analysis." Applied Mechanics and Materials 685 (October 2014): 228–31. http://dx.doi.org/10.4028/www.scientific.net/amm.685.228.

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This article describes the reasons for vibration and off-axis S-type single-stage double-suction centrifugal pumps,due to the design of the pump itself and the reasons for which the work environment and the work of the pump caused by the vibration,thereby causing the shaft fracture, and other reasons, resulting in breakage of the pump shaft from a comprehensive analysis of the reason for the above problems.

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9

M.S. Dzhumataev, A.Zh. Bayaliev, and S.T. Solpiev. "TO THE QUESTION OF CREATING A STRUCTURE OF A DOUBLE-PISTON PUMP FOR SUBMITTING SAND-CEMENT MORTAR." Herald of KSUCTA n a N Isanov, no. 3 (September 23, 2019): 404–10. http://dx.doi.org/10.35803/1694-5298.2019.3.404-410.

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This article discusses the issue of creating an import-substituting chopper design for a double-piston pump for supplying sand and cement mortar in order to partially meet the needs of construction organizations of the Kyrgyz Republic for this equipment. The relevance of mastering the production of mortar pumps for the transportation and application of plaster to the surface during the finishing works, pumping solutions into various cavities during construction, repair of buildings and drilling wells plugging is indicated. A review and analysis of the existing mortar pumps was carried out, the qualifications of the mortar pumps by the method of action of the displacer on the pumped solution, in the direction of solution movement in the working chamber during suction were given. The principle of operation is shown and the advantages and disadvantages are noted. Specified prevailing mortar pumps are indicated.

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10

Jin, Faye, Zhifeng Yao, Duanming Li, Ruofu Xiao, Fujun Wang, and Chenglian He. "Experimental Investigation of Transient Characteristics of a Double Suction Centrifugal Pump System during Starting Period." Energies 12, no. 21 (October 30, 2019): 4135. http://dx.doi.org/10.3390/en12214135.

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The starting phase for pumps in water transportation pipelines is crucial and has significant transient characteristics which merit further study in order to evaluate the operational stability of the pumping system. This paper presents the results of a study in which the relative steady operating conditions and starting period of a large double-suction centrifugal pump were monitored in real time, including pressure fluctuations, shaft run-out and vibration at the bearing. The transient characteristics of a double-suction centrifugal pump under different operating conditions have been analyzed using fast Fourier transform (FFT) and continuous wavelet transform (CWT). Results indicate broadband frequency components within the spectrum of pressure fluctuations in the volute casing under all test conditions, and the central frequency of the broadband frequency gradually decreases as flow rate increases and approaches the blade frequency, which is the primary reason for an increase in blade-frequency amplitude. This may produce a vibration frequency that is similar to the natural frequency of a certain part of the double-suction centrifugal pump during the starting period, which causes the resonance phenomenon. The radial force is also large during the starting period, which causes eccentric wear of the seal ring at the impeller inlet.

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11

Yao, Zhifeng, Min Yang, Ruofu Xiao, and Fujun Wang. "Influence of wall roughness on the static performance and pressure fluctuation characteristics of a double-suction centrifugal pump." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 7 (February 8, 2018): 826–40. http://dx.doi.org/10.1177/0957650918757246.

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The unsteady flow field and pressure fluctuations in double-suction centrifugal pumps are greatly affected by the wall roughness of internal surfaces. To determine the wall roughness effect, numerical and experimental investigations were carried out. Three impeller schemes for different wall roughness were solved using detached eddy simulation, and the performance and pressure fluctuations resolved by detached eddy simulation were compared with the experimental data. The results show that the effects of wall roughness on the static performance of a pump are remarkable. The head and efficiency of the tested double-suction centrifugal pump are raised by 2.53% and 6.60% respectively as the wall roughness is reduced by means of sand blasting and coating treatments. The detached eddy simulation method has been proven to be accurate for the prediction of the head and efficiency of the double-suction centrifugal pump with roughness effects. The influence of the roughness on pressure fluctuation is greatly dependent on the location relative to the volute tongue region. For locations close to the volute tongue, the peak-to-peak value of the pressure fluctuations of a wall roughness of Ra = 0.10 mm may be 23.27% larger than the case where Ra = 0.02 mm at design flow rate.

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12

Pei, Ji, Majeed Koranteng Osman, Wenjie Wang, Jianping Yuan, Tingyun Yin, and Desmond Appiah. "Unsteady flow characteristics and cavitation prediction in the double-suction centrifugal pump using a novel approach." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 3 (July 24, 2019): 283–99. http://dx.doi.org/10.1177/0957650919863636.

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The recent advances in centrifugal pump design do not only require a better suction performance but also there have been attempts to reduce design time at a lower cost. The traditional trial-and-error optimization design method, however, depends on the designer's experience, which requires longer cycles. This is because the computational process of calculating the net positive suction head required (NPSHr) involves several calculation steps and this consumes a lot of computational time. An investigation was therefore carried out to test a novel NPSHr prediction method in a double-suction centrifugal pump using unsteady numerical simulations. In the new approach, a new boundary pair was introduced and an algorithm was used to estimate a good value for a static pressure value that correlates to a 3% drop in pump head to determine the critical cavitation point. Experiments were conducted to validate the hydraulic performance and the cavitation model. The NPSHr and the characteristic “sudden” head-drop were very well predicted by the novel approach in only three simulation steps. The internal flow analysis showed that for 0.6 Q d, the flow around the volute tongue was uneven at NPSH = 10.06 m, inducing flow separation and recirculation at the tongue region. Attached cavities were also observed around the suction ring in the spiral suction domain. The pressure fluctuations were analyzed also and the dominant frequency at the pump outlet and tongue region was the blade passing frequency. Consequently, the novel approach proved very robust and efficient in NPSHr prediction and would be a good alternative to shorten simulation time during cavitation optimization design process in centrifugal pumps.

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13

Wang, Fu-Jun, Li-Xia Qu, Ling-Yan He, and Jiang-Yong Gao. "Evaluation of Flow-Induced Dynamic Stress and Vibration of Volute Casing for a Large-Scale Double-Suction Centrifugal Pump." Mathematical Problems in Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/764812.

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The transient analysis was carried out to investigate the dynamic stress and vibration of volute casing for a large double-suction centrifugal pump by using the transient fluid-structure interaction theory. The flow pulsations at flow rate ranging from 60% to 100% of the nominal flow rate (Qd) were taken as the boundary conditions for FEM analysis of the pump volute casing structure. The results revealed that, for all operating conditions, the maximum stress located at the volute tongue region, whereas the maximum vibration displacement happened close to the shaft hole region. It was also found that the blade passing frequency and its harmonics were dominant in the variations of dynamic stress and vibration displacement. The amplitude of the dominant frequency for the maximum stress detected at 0.6Qdwas 1.14 times that atQd, lower than the related difference observed for pressure fluctuations (3.23 times). This study provides an effective method to quantify the flow-induced structural dynamic characteristics for a large-scale double-suction pump. It can be used to direct the hydraulic and structural design and stable operation, as well as fatigue life prediction for large-scale pumps.

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14

Wang, Wenjie, Yanpin Li, Majeed Koranteng Osman, Shouqi Yuan, Benying Zhang, and Jun Liu. "Multi-Condition Optimization of Cavitation Performance on a Double-Suction Centrifugal Pump Based on ANN and NSGA-II." Processes 8, no. 9 (September 10, 2020): 1124. http://dx.doi.org/10.3390/pr8091124.

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Double-suction centrifugal pumps form an integral part of power plant systems in maintaining operational stability. However, there has been a common problem of achieving a better cavitation performance over a wider operating range because the traditional approach for impeller design often leads to the design effect not meeting the operational needs at off-design conditions. In addressing the problem, an optimization scheme was designed with the hub and shroud inlet angles of the double-suction impeller to minimize the suction performance at non-design flow conditions. A practical approach that speeds up the cavitation simulation process was applied to solve the experimental design, and a multi-layer feed forward artificial neural network (ANN) was combined with the non-dominated sorting genetic algorithm II to solve the multi-objective problem into three-dimensional (3D) Pareto optimal solutions that meet the optimization objective. At the design point, the suction performance was improved by 6.9%. At non-design flow conditions, the cavitation performance was improved by 3.5% at 1.2Qd overload condition, 4% at 0.8Qd, and 5% at 0.6Qd. Additionally, there was significant reduction in the attached cavity distribution in the impeller and suction domains when the optimized model was compared to the original model at off-design points. Finally, the optimization established a faster method for a three-objective optimization of cavitation performance using ANN and 3D Pareto solutions.

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15

BRUNDTLAND, TERJE. "From medicine to natural philosophy: Francis Hauksbee's way to the air-pump." British Journal for the History of Science 41, no. 2 (March 6, 2008): 209–40. http://dx.doi.org/10.1017/s000708740800085x.

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AbstractFrancis Hauksbee (1660–1713) is well known for his double-barrelled air-pump. However, the origin of this pump, and Hauksbee's background, are often described as a mystery. This text seeks to dispel the riddle. It is argued that Hauksbee's competence as an exceptional maker of air-pumps was developed between 1699 and 1703 as a result of his experiences with the construction, manufacturing and sale of cupping-glasses. His cupping utensils embodied a new design, where syringes were used to evacuate the glasses, instead of the traditional way by fire or mouth suction. These syringes, which in fact were small air-pumps, were perfected between 1699 and 1701. A larger syringe, introduced in 1701, served as a transition from the cupping-syringe to his first air-pump for use in natural philosophy. This syringe was described as a ‘combined engine’, which could serve as an air-pump, a condensing engine and a syringe for injecting air, wax or mercury into pathological specimens. Hauksbee's first air-pump was a single-barrelled model introduced in 1702, based on the combined engine. Its various features, such as easy and convenient leak-tightening, exact pressure measurements by an in-built barometer and an air-inlet function for readmission of air into the receiver, are discussed. Finally, it is shown that these activities gave Hauksbee the reputation of being an outstanding instrument-maker, years before the double-barrelled air-pump was in sight.

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16

Capurso, T., L. Bergamini, and M. Torresi. "Design and CFD performance analysis of a novel impeller for double suction centrifugal pumps." Nuclear Engineering and Design 341 (January 2019): 155–66. http://dx.doi.org/10.1016/j.nucengdes.2018.11.002.

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17

Hodkiewicz, M. R., and M. P. Norton. "The effect of change in flow rate on the vibration of double-suction centrifugal pumps." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 216, no. 1 (February 2002): 47–58. http://dx.doi.org/10.1243/095440802760075030.

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18

KONNO, Daisuke, Seiyo MAEKAWA, and Asahiro WAKIGAWA. "A study of allowable piping loads on double-suction centrifugal pumps (2nd report, Shaft displacement due to pump casing deformation)." Transactions of the Japan Society of Mechanical Engineers Series B 51, no. 465 (1985): 1660–65. http://dx.doi.org/10.1299/kikaib.51.1660.

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19

KONNo, Daisuke, Seiyo MAEKAWA, and Asahiro WAKIGAWA. "A Study of Allowable Piping Loads on Double-suction Centrifugal Pumps : 2nd Report, Shaft Displacement Due to Pump Casing Deformation." Bulletin of JSME 29, no. 247 (1986): 113–18. http://dx.doi.org/10.1299/jsme1958.29.113.

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20

Rehman, Atiq Ur, Akshoy Ranjan Paul, and Anuj Jain. "Performance Analysis and Cavitation Prediction of Centrifugal Pump Using Various Working Fluids." Recent Patents on Mechanical Engineering 12, no. 3 (September 26, 2019): 227–39. http://dx.doi.org/10.2174/2212797612666190619161711.

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Background: The application of centrifugal pumps is found in domestic and petrochemical industries. Industrial centrifugal pumps are designed and tested using water as working fluid before supplied to industries, as water is commonly available. However, centrifugal pumps are used in industries for various applications, which involve the handling of fluids other than water- like saline-water, crude oil, gasoline, etc. Consequently, hydraulic performance of the pump differs from the designed and tested values and pump performance becomes unpredictable. Cavitation characteristics of the pump handling different fluids other than water are also changed and many a time, cavitation starts prematurely. As a result, the operating cost of pump is increased. Objective: A CFD based computational analysis of a single-stage, single-entry industrial centrifugal pump having double-volute casing is carried out to compare the performance and cavitation characteristics for various working fluids, namely water, saline water with varying salinity, gasolene and crude oil. Methods: Multiple Reference Frame method (MRF) available in Reynolds-Averaged Navier-Stokes (RANS) equations based CFD solver Ansys-CFX is used in the present study. CFD simulation is carried out for five flow rates with Standard k-ε turbulence model. Rayleigh-Plesset equation describing the growth of a single vapor bubble in a liquid is used for predicting the cavitation flow behaviour. Results: Minimum static pressure is computed at the suction side of saline water as compared to the other working fluids studied here. Hydraulic efficiency of crude oil is found to be the lowest as compared to other fluids. Supercavitation (excessive formation of vapor bubbles and sudden drop in head up to 3%) starts early for saline water with 40g/kg salinity. Conclusion: The results show little variation in pump efficiency when water and saline water are used as working fluids. However, cavitation characteristics differ considerably with the working fluids. Recent patents filed/published in this area revealed that efforts are needed to develop effective cavitationresistant centrifugal impellers and pumps.

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21

Isaev, N., G. Budaev, D. Danilov, and K. Dobrokhodov. "Investigation of the influence of wear in impeller seals on the axial force in double suction pumps." IOP Conference Series: Materials Science and Engineering 779 (April 24, 2020): 012051. http://dx.doi.org/10.1088/1757-899x/779/1/012051.

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22

KONNO, Daisuke, Seiyo MAEKAWA, and Asahiro WAKIGAWA. "A study of allowable piping loads on double-suction centrifugal pumps. 3rd report. Slip of pump feet caused by piping load." Transactions of the Japan Society of Mechanical Engineers Series B 51, no. 470 (1985): 3386–91. http://dx.doi.org/10.1299/kikaib.51.3386.

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23

KONNO, Daisuke, Seiyo MAEKAWA, and Asahiro WAKIGAWA. "A study of Allowable Piping Loads on Double-suction Centrifugal Pumps : 3rd Report, Slip of Pump Feet Caused by Piping Load." Bulletin of JSME 29, no. 252 (1986): 1775–80. http://dx.doi.org/10.1299/jsme1958.29.1775.

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24

Kanemoto, Toshiaki, and Shin Oba. "Proposition of Unique Pumping System with Counter-Rotating Mechanism." International Journal of Rotating Machinery 10, no. 4 (2004): 233–40. http://dx.doi.org/10.1155/s1023621x04000259.

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Turbo-pumps have weak points, such as when the pumping operation becomes unstable in the rising portion of the head characteristics and/or the cavitation occurs under the intolerably low suction head. To overcome both weak points simultaneously, this article proposes a unique pumping system with counter-rotating mechanism, which consists of two stage impellers and a peculiar motor with double rotors. The front and the rear impellers are driven by the inner and the outer rotors of the motor, respectively, keeping the relative rotational speed constant and counter-balancing the rotational torque. Such driving conditions not only smartly improve the unstable performance at lower discharge, but also suppress the cavitation at higher discharge, in the optimum cooperation with the impeller works and the rotor outputs.

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25

Capurso, Tommaso, Michele Stefanizzi, Giuseppe Pascazio, Sergio Ranaldo, Sergio Camporeale, Bernardo Fortunato, and Marco Torresi. "Slip Factor Correction in 1-D Performance Prediction Model for PaTs." Water 11, no. 3 (March 19, 2019): 565. http://dx.doi.org/10.3390/w11030565.

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In recent years, pumps operated as turbines (PaTs) have been gaining the interest of industry and academia. For instance, PaTs can be effectively used in micro hydropower plants (MHP) and water distribution systems (WDS). Therefore, further efforts are necessary to investigate their fluid dynamic behavior. Compared to conventional turbines, a lower number of blades is employed in PaTs, lowering their capability to correctly guide the flow, hence reducing the Euler’s work; thus, the slip phenomenon cannot be neglected at the outlet section of the runner. In the first part of the paper, the slip phenomenon is numerically investigated on a simplified geometry, evidencing the dependency of the lack in guiding the flow on the number of blades. Then, a commercial double suction centrifugal pump, characterized by the same specific speed, is considered, evaluating the dependency of the slip on the flow rate. In the last part, a slip factor correlation is introduced based on those CFD simulations. It is shown how the inclusion of this parameter in a 1-D performance prediction model allows us to reduce the performance prediction errors with respect to experiments on a pump with a similar specific speed by 5.5% at design point, compared to no slip model, and by 8% at part-loads, rather than using Busemann and Stodola formulas.

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26

KONNO, Daisuke, Seiyo MAEKAWA, and Asahiro WAKIGAWA. "A Study of Allowable Piping Loads on Double-suction Centrifugal Pumps : 1st Report, Casing Stress Distribution Produced by Piping Loads with Added Internal Pressure." Bulletin of JSME 28, no. 241 (1985): 1430–35. http://dx.doi.org/10.1299/jsme1958.28.1430.

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27

Song, Liquan, Liping Zeng, Jiandong Zhou, and Xiao Luo. "Profile design for the cylinder of a double-acting rotary vane compressor." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 13 (June 25, 2015): 2300–2313. http://dx.doi.org/10.1177/0954406215592923.

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Inner wall profile of the cylinder in a rotary vane compressor (RVC), which influences the motion characteristics of vanes, suction volume, friction characteristic, etc., plays an important role in the performance of the compressor. This work mainly aims at the profile design of a new cylinder for a double-acting RVC with harmonic profile cylinder on the basis of not changing integrate size. According to the relation between cylinder profile and vane motion characteristics, a method for the cylinder profile design is proposed in this paper. With an assumed vane motion, equations of the cylinder profile, cell volume of the compressor as well as pressure angles between vanes and cylinder inner wall are constructed preliminarily. And then through adjusting parameters and optimization with an independently developed procedure, a new cylinder with the so-called combined profile is obtained. Theoretical analysis of the cell volume variations and the pressure angles between vanes and cylinder are conducted. The results show that there is neither rigid impulse nor soft impulse between vanes and cylinder due to the vane continuous motion including displacement, velocity and acceleration. And the pressure angles between vane and cylinder and working volume of the compressor with the new profile cylinder are superior to harmonic profile cylinder, which is useful for the reduction of friction power in the operation of compressor. Experiments show that the cooling capacity and COP of the test refrigeration cycle with the proposed combined profile cylinder is higher than the compressor with harmonic profile cylinder. And the volumetric efficiency and isentropic efficiency of the compressor with combined profile cylinder have better performance. This method can be applied to the design of the cylinder for multiple-acting rotary vane compressors, rotary vane expanders and vane pumps.

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28

Childs, D. W. "Fluid-Structure Interaction Forces at Pump-Impeller-Shroud Surfaces for Axial Vibration Analysis." Journal of Vibration and Acoustics 113, no. 1 (January 1, 1991): 108–15. http://dx.doi.org/10.1115/1.2930144.

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Solutions are presented for the dynamic axial forces developed by pump-impeller-shroud surfaces. A bulk-flow model of the leakage path between the impeller and the housing is used for the analysis consisting of the path-momentum, circumferential-momentum, and continuity equations. Shear stresses at the impeller and housing surfaces are modeled according to Hirs’ turbulent lubrication model. The governing equations were developed earlier to examine lateral rotordynamic forces developed by impellers. A perturbation expansion of the governing equations in the eccentricity ratio yields a set of zeroth and first-order governing equations. The zeroth-order equations define the leakage rate, velocity distributions, and the pressure distribution for a centered impeller position. The first-order equations define the perturbations in the velocity and pressure distributions due to axial motion of the impeller. Integration of the perturbed pressure and shear-stress distribution acting on the rotor yields the reaction forces acting on the impeller face. Calculated results yield predictions of resonance peaks of the fluid within the annulus formed by the impeller shroud and housing. Centrifugal acceleration terms in the path-momentum equation are the physical origin of these unexpected predictions. For normalized tangential velocities at the inlet to the annulus, uθo(0) = Uθo(0)/Riω of 0.5, the phenomenon is relatively minor. As uθo(0) is increased to 0.7, sharper peaks are predicted. The fluid modes are well damped in all cases. Numerical results are presented for a double-suction single-stage pump which indicate that the direct stiffness of the perturbed impeller shroud forces are negligible. Small but appreciable added-mass and damping terms are developed which have a modest influence on damping and peak-amplitude excitation frequency. The forces only became important for pumps with very low axial natural frequencies in comparison to the running speed, viz., ten percent of the running speed or lower.

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29

Villanueva, Mark D., and Joffrey E. Hapitan. "Design, Fabrication and Testing of Hydraulic Turbine Runner for a Double Suction Centrifugal Pump in Turbine Mode." International Journal of Materials, Mechanics and Manufacturing 7, no. 6 (December 2019): 259–64. http://dx.doi.org/10.18178/ijmmm.2019.7.6.471.

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30

Hu, Le, Shu Jia Zhang, and Cheng Xu. "The Use of Steady Multi-Phase Position and Unsteady Computational Methods in the Numerical Simulation of Double-Suction Centrifugal Pump." Advanced Materials Research 181-182 (January 2011): 201–5. http://dx.doi.org/10.4028/www.scientific.net/amr.181-182.201.

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In order to compare the steady multi-phase and unsteady calculation in double-suction centrifugal pump application, this article simulates the internal turbulent flow of the 150S-50 double suction centrifugal pump. Numerical simulation uses realizable turbulence model, simulating with two methods of steady multi-phase and unsteady in 7 cases. Based on the numerical simulation, the head, shaft power, efficiency were calculated, the simulated performance curves of a double suction centrifugal pump is processed. The results show that: The results of unsteady simulation are closer with the experimental data.

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31

Lorenz, Witold, and Marcin Janczak. "Analysis of the reasons of double suction centrifugal pump’s failure." Mechanik 90, no. 11 (November 13, 2017): 1084–87. http://dx.doi.org/10.17814/mechanik.2017.11.187.

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The issue of a pump operation beyond its recommended range and required flow conditions to the suction flange and consequently failure of double suction axially split centrifugal pump was explained. The increased vibration level, improper configuration of the suction pipeline and used hydraulics were presented. It was also illustrated how to diagnose and solve a problem which after implementation at the target workplace has confirmed the correctness of implemented design solutions.

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32

Vyavahare, Pranav, Lokavarapu Bhaskara Rao, and Nilesh Patil. "CFD Analysis of Double Suction Centrifugal Pump with Double Volute." Periodica Polytechnica Mechanical Engineering 62, no. 1 (December 21, 2017): 74. http://dx.doi.org/10.3311/ppme.11425.

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In this study, Computational Fluid Dynamics (CFD) Analysis is used to investigate the flow in the centrifugal pump impeller using the ANSYS-CFX. Impeller is designed for head of 22 m, discharge of 52.239 m3/hr and for the operating speed of 2970 RPM. Impeller vane profile is generated by tangent arc method and CFD analysis is performed for 1st stage of vertical pump out of 15 stages. Velocity and pressure distribution are analysed for casing and impeller. Using ANSYS-CFX head developed by this impeller is calculated and compared with the required value. From results of CFD analysis, performance curves are plotted and compared with analytical performance curves. Results obtained from CFD nearly matches with analytical results.

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33

Năstase, Eugen-Vlad. "Design and flow simulation for a centrifugal pump with double suction impeller." MATEC Web of Conferences 178 (2018): 05018. http://dx.doi.org/10.1051/matecconf/201817805018.

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Centrifugal pump is a hydraulic machine that is used to transport fluids by the conversion of rotational kinetic energy of impeller into the hydrodynamic energy of the fluid flow. The double-suction centrifugal pump are used for conveyance of a large quantity of water and have wide application due to its stable running, for the balance of axial thrust through by the double suction in impeller, and for a convenient maintenance. Because the design of the centrifugal pump impeller is not a universally standardized one and depends on designer's experience and its technical intuition, in this paper is presented a methodology of design and the fluid flow simulation throughout impeller.

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34

Luo, XianWu, Lei Zhu, BaoTang Zhuang, HongYuan Xu, WeiPing Yu, and Michihiro Nishi. "A novel shaft-less double suction mini pump." Science in China Series E: Technological Sciences 53, no. 1 (January 2010): 105–10. http://dx.doi.org/10.1007/s11431-010-0022-7.

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35

Wang, Wenjie, Majeed Koranteng Osman, Ji Pei, Shouqi Yuan, Jian Cao, and Fareed Konadu Osman. "Efficiency-House Optimization to Widen the Operation Range of the Double-Suction Centrifugal Pump." Complexity 2020 (September 26, 2020): 1–18. http://dx.doi.org/10.1155/2020/9737049.

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Most pumping machineries have a problem of obtaining a higher efficiency over a wide range of operating conditions. To solve that problem, an optimization strategy has been designed to widen the high-efficiency range of the double-suction centrifugal pump at design (Qd) and nondesign flow conditions. An orthogonal experimental scheme is therefore designed with the impeller hub and shroud angles as the decision variables. Then, the “efficiency-house” theory is introduced to convert the multiple objectives into a single optimization target. A two-layer feedforward artificial neural network (ANN) and the Kriging model were combine based on a hybrid approximate model and solved with swarm intelligence for global best parameters that would maximize the pump efficiency. The pump performance is predicted using three-dimensional Reynolds-averaged Navier–Stokes equations which is validated by the experimental test. With ANN, Kriging, and a hybrid approximate model, an optimization strategy is built to widen the high-efficiency range of the double-suction centrifugal pump at overload conditions by 1.63%, 1.95%, and 4.94% for flow conditions 0.8Qd, 1.0Qd, and 1.2Qd, respectively. A higher fitting accuracy is achieved for the hybrid approximation model compared with the single approximation model. A complete optimization platform based on efficiency-house and the hybrid approximation model is built to optimize the model double-suction centrifugal pump, and the results are satisfactory.

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36

Deng, Qifan, Ji Pei, Wenjie Wang, Bin Lin, Chenying Zhang, and Jiantao Zhao. "Energy Loss and Radial Force Variation Caused by Impeller Trimming in a Double-Suction Centrifugal Pump." Entropy 23, no. 9 (September 18, 2021): 1228. http://dx.doi.org/10.3390/e23091228.

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Impeller trimming is an economical method for broadening the range of application of a given pump, but it can destroy operational stability and efficiency. In this study, entropy production theory was utilized to analyze the variation of energy loss caused by impeller trimming based on computational fluid dynamics. Experiments and numerical simulations were conducted to investigate the energy loss and fluid-induced radial forces. The pump’s performance seriously deteriorated after impeller trimming, especially under overload conditions. Energy loss in the volute decreased after trimming under part-load conditions but increased under overload conditions, and this phenomenon made the pump head unable to be accurately predicted by empirical equations. With the help of entropy production theory, high-energy dissipation regions were mainly located in the volute discharge diffuser under overload conditions because of the flow separation and the mixing of the main flow and the stalled fluid. The increased incidence angle at the volute’s tongue after impeller trimming resulted in more serious flow separation and higher energy loss. Furthermore, the radial forces and their fluctuation amplitudes decreased under all the investigated conditions. The horizontal components of the radial forces in all cases were much higher than the vertical components.

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37

Hatano, Shinya, Donghyuk Kang, Shusaku Kagawa, Motohiko Nohmi, and Kazuhiko Yokota. "Study of Cavitation Instabilities in Double-Suction Centrifugal Pump." International Journal of Fluid Machinery and Systems 7, no. 3 (September 30, 2014): 94–100. http://dx.doi.org/10.5293/ijfms.2014.7.3.094.

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38

Škerlavaj, A., M. Morgut, D. Jošt, and E. Nobile. "Optimization of a single-stage double-suction centrifugal pump." Journal of Physics: Conference Series 796 (January 2017): 012007. http://dx.doi.org/10.1088/1742-6596/796/1/012007.

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39

Škerlavaj, A., M. Titzschkau, R. Pavlin, F. Vehar, P. Mežnar, and A. Lipej. "Cavitation improvement of double suction centrifugal pump HPP Fuhren." IOP Conference Series: Earth and Environmental Science 15, no. 2 (November 26, 2012): 022009. http://dx.doi.org/10.1088/1755-1315/15/2/022009.

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40

Nyi, Nyi, Aung Ko, and Cho Cho Khaing. "Design and Performance Analysis of Double-Suction Centrifugal Pump." International Journal of Scientific and Research Publications (IJSRP) 9, no. 8 (August 24, 2019): p92129. http://dx.doi.org/10.29322/ijsrp.9.08.2019.p92129.

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41

Song, Yu, Honggang Fan, Wei Zhang, and Zhifeng Xie. "Flow Characteristics in Volute of a Double-Suction Centrifugal Pump with Different Impeller Arrangements." Energies 12, no. 4 (February 19, 2019): 669. http://dx.doi.org/10.3390/en12040669.

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As an important type of centrifugal pump, the double-suction pump has been widely used due to its high efficiency region and large flow rate. In the present study, the complex flow in volute of a double-suction centrifugal pump is investigated by numerical simulation using a re-normalization group (RNG) k-ε model with experimental validation. Axial flows are observed in volute near the impeller outlet and compared with four staggered angles. The net area-weighted average axial velocities decrease as the staggered angle increases. The axial flows are mainly caused by the different circumferential pressure distribution at the twin impeller outlet. The dominant frequencies of the axial velocities for different staggered angles are fBP and its harmonic. The pressure fluctuations in most regions of the volute are obtained by superimposing the pressure generated by the two impellers.

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42

Luo, Bao Jie, Lin Long Song, and Pan Zhao. "Matching Optimization of Impeller and Volute for Double-Channel with Double-Suction Pump." Advanced Materials Research 904 (March 2014): 311–14. http://dx.doi.org/10.4028/www.scientific.net/amr.904.311.

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In order to study the matching optimization of the impeller and volute as well as the flow characteristics of double-channel with double-suction pump ,this paper based on CFD performance prediction method uses the same impeller to match the volute with different base diameters, guaranteeing the volute inlet width, flow cross-sectional area, and tongue position unchanged .The calculation results show that scheme A with the largest volute base diameter can not only achieve the excellent energy characteristics and the velocity-pressure uniform distributions, but also the exchange of the fluid energy is more sufficient in the volute. On one hand, a large clearance can not only make the movement interference intensity weaken between the impeller and volute, but also can decrease the high frequency components of the pressure pulsations .On the other hand, the big gap can maximum exert the pump effects to convey liquids containing solid suspended particles as well as the fibrous suspended matters. The research can not only provide some references to further study on matching optimization of the impeller and volute but also can contribute to the hydraulic design of the impeller and volute.

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43

Zhou, Jian Song, Shu Jia Zhang, and Peng Zhan Mao. "Performance Optimization Based on Genetic Algorithm of Double Suction Centrifugal Pump." Advanced Materials Research 468-471 (February 2012): 2565–68. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.2565.

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The object is based on 150S-50 double suction centrifugal pump. At first establish the objective function which is based on the smallest hydraulic losses using the loss extremum method, and build constraint relationship between the parameters of impeller using geometry relationship. In order to get the geometric parameters, it is important to go for optimal calculation for the function using the software called matlab which is based on genetic algorithm. At last modeling, solving the internal flow field and comparing with the previous performance. The result shows that the pump hydraulic efficiency has increased by 0.7% under the normal conditions.

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44

Zhuang, Baotang, Xianwu Luo, Lei Zhu, Xin Wang, and Hongyuan Xu. "Cavitation in a Shaft-less Double Suction Centrifugal Miniature Pump." International Journal of Fluid Machinery and Systems 4, no. 1 (March 31, 2011): 191–98. http://dx.doi.org/10.5293/ijfms.2011.4.1.191.

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45

Shukla, Shyam Narayan, Ruchi Khare, and Vishnu Prasad. "Numerical Prediction of NPSHR Characteristics of Double Suction Centrifugal Pump." International Journal of Engineering and Technology 9, no. 2 (April 30, 2017): 1280–87. http://dx.doi.org/10.21817/ijet/2017/v9i2/170902255.

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46

Guzzomi, Andrew, and Jie Pan. "Monitoring single-stage double-suction pump efficiency using vibration indicators." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 228, no. 4 (September 20, 2013): 332–36. http://dx.doi.org/10.1177/0954408913502471.

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47

Sato, T., T. Nagahara, K. Tanaka, M. Fuchiwaki, and F. Shimizu. "Vortex cavitation and oscillation in a double-suction volute pump." IOP Conference Series: Earth and Environmental Science 12 (August 1, 2010): 012019. http://dx.doi.org/10.1088/1755-1315/12/1/012019.

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48

Sun, S. H., P. B. Wu, P. C. Guo, G. Z. Yi, A. Kovacevic, H, Zhang, and G. K. Wu. "Numerical investigation on a double suction twin-screw multiphase pump." IOP Conference Series: Earth and Environmental Science 774, no. 1 (June 1, 2021): 012048. http://dx.doi.org/10.1088/1755-1315/774/1/012048.

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49

Lugova, Svitlana, Hanna Matvieieva, Andrii Rudenko, and Igor Tverdokhleb. "Determination of Static and Dynamic Component of Axial Force in Double Suction Centrifugal Pump." Applied Mechanics and Materials 630 (September 2014): 13–20. http://dx.doi.org/10.4028/www.scientific.net/amm.630.13.

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This article observes the research results of flow behavior in the impeller chamber of the double suction centrifugal pump. On the basis of the research results we have determine the values of static and dynamic component of axial force.

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50

Wei, Zhicong, Wei Yang, and Ruofu Xiao. "Pressure Fluctuation and Flow Characteristics in a Two-Stage Double-Suction Centrifugal Pump." Symmetry 11, no. 1 (January 8, 2019): 65. http://dx.doi.org/10.3390/sym11010065.

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Pressure fluctuation is the primary factor that affects the stability of turbomachines. The goal of the present work is to explore the propagation of pressure fluctuations in a two-stage double-suction centrifugal pump. The pressure fluctuation characteristics of each component of a two-stage double-suction centrifugal pump are simulated under four typical flow rates based on the SST k-ω turbulence model. It is shown that the pressure fluctuation frequency at blade passing frequency and its first harmonic is the same at the suction chamber, the leading edge, and the middle of the first-stage impeller, which is different from the rotor–stator interaction. Moreover, the uneven impeller inlet flow distribution will produce fluctuations with rotation frequency and its harmonics at the leading edge of the impellers in both stages. Finally, broadband frequency is found at the trailing edge of the impellers in both stages associated with the first harmonic of the rotation frequency, especially under the part load condition. The large size backflow vortex appears in the blade flow channel leading to the low-pressure zone between the impeller, the tongue, and the start of the partition. That is why the pressure drops significantly twice in one rotation period when the blades pass through the tongue and the start of the partition.

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