bluuebunny/crossref_metadata_2025_split huggingface dataset:
Engineering evaluation and reflection on the operation stability of large-scale tubular pump
Authors: Wang Hao , Wang Baoluo , Cao Jiaqiao , Zhu Quanrong , Song Mengbin , Wang Chaoyue , Wang Fujun 
Published: October 2024

Abstract
Large-scale tubular pumps are widely used in the fields such as low-head agricultural irrigation, water diversion project and urban drainage. For this pump type, the rotation axis is perpendicular to the gravity direction, resulting in the operation instability risks induced by the constant static pressure difference. However, due to the large size of prototype pumps and the difficulty of field tests, there is currently a lack of on-site monitoring data, which makes it difficult to truly understand the actual operation of large-scale tubular pumps and to provide engineering experience with direct guidance for similar projects. To fill this research gap, this paper takes the largest shaft-well tubular pump in China as an example, and the on-site monitoring of the prototype is carried out. On the one hand, the distribution characteristics of stability indexes such as pressure fluctuations, vibrations and shaft swings are quantified, and it is proved that the performance of large-scale tubular pumps cannot be estimated only by the hydraulic model experiments. On the other hand, the potential risks to be addressed such as the phenomenon of pressure polarization oscillation, low-speed-induced dry friction of bearing shells, and the cantilever-induced bending deformation of pump shaft are reflected, which should be paid more attention to in the future development. These research results can provide valuable engineering experience for the safe and stable operation of large-scale tubulars.
Effect of volute structure on the performance of double suction centrifugal pump
Authors: Chi Gao , Chenhao Li , Xingqi Luo , Xitong Wu , Guojun Zhu 
Published: October 2024

Abstract
This study aims to investigate the impact of the double volute structure on the internal flow dynamics and hydraulic performance of a double-suction pump. To achieve this, a double-suction centrifugal pump was selected as the research subject, and three-dimensional turbulence numerical simulations were conducted under various working conditions using the Reynolds average method (RANS) and RNG k-ε turbulence model. The results of the simulation are compared with the experimental data, which demonstrates the validity of the numerical simulation. This study analyzes the impact of the splitter on the flow field within the volute and impeller, as well as its effect on the radial force of the impeller. The results indicate that the water flow has a significant impact on the head of the splitter, resulting in a noticeable high-pressure zone on the pressure side of the blade in close proximity to the starting end of the splitter; Under off-design conditions, a significant recirculation zone exists between the end of the splitter and the pump outlet, and it increases as the deviation from the designed condition increases; In the case of a small flow rate, the flow inhomogeneity near the starting end of the splitter is serious, and there are large zones of low speed on the outside of the splitter; The double volute structure can make the inlet velocity of the volute more evenly distributed along the circumferential direction, and can be effectively utilized to reduce the radial force exerted on the impeller, thereby improving its performance.
Application of voiceprint monitoring technology in the construction of smart pumping stations
Authors: Liu Xueqin , Guo Ziyang , Wang Yan , Zhang Rentian , Liang Yunhui 
Published: October 2024

Abstract
In this paper the aim is to realize the real-time monitoring of the operating status of the equipment in the smart pumping station based on the principles of voiceprint monitoring and the characteristics of the pumping stations. To achieve this aim, the data of pumping stations were firstly collected, preprocessed and the feature values were extracted. Then, the data were used to train a convolutional neural network (CNN) deep learning recognition model. Finally, a voiceprint samples database and a model library of the operating status were established and a voiceprint monitoring system for the vibration state of the pumping station equipment was constructed based on the CNN deep learning recognition model. A case study of a mixed-flow pumping station was carried out. In this case study, a voiceprint detection system was arranged on site and the operation status of the equipment can be monitored and evaluated through practical application of the system. Further, the health status of the equipment can be effectively diagnosed and evaluated, and abnormal faults can be analyzed and predicted. The results indicate that the reliability of equipment operation has improved through the application of voiceprint monitoring technology which provides an effective technical means for the construction of smart pumping stations.
Hemolysis analysis of centrifugal blood pump based on numerical simulation
Authors: Shi Suxuan , Han Jinying , Luo Yi 
Published: October 2024

Abstract
The operation of blood pump will cause mechanical damage to red blood cells and lead to hemolysis. Based on this, CFD technology is used to simulate the three-dimensional flow field of centrifugal blood pump. According to the analysis of velocity field, pressure field and stress field; Based on the hemolysis power function model, the hemolysis performance of blood pump is predicted by Lagrange particle tracking method, and the impeller structure is adjusted to improve its flow performance and reduce the hemolysis index. The research results can provide a basis for the structural improvement and performance improvement of centrifugal heart pump.
Design Improvement for Interventional Blood Pumps Based on Flow Analysis
Authors: Cai Zhenghao , Jian Meng , Xu Zhonghua , Zhang Mingkui , Luo Xianwu 
Published: October 2024

Abstract
Interventional blood pumps serve as a crucial component for temporary mechanical circulatory support in the treatment of heart failure, specifically designed to improve blood circulation recovery and survival rate in patients undergoing treatment for acute cardiovascular diseases. This study aims to design a novel interventional blood pump with a focus on achieving exceptional hydraulic performance and superior blood compatibility based on numerical simulation, which considers the interactions between the blood pump and the upstream (drainage cannula) and downstream (aorta) flow fields, establishing a full-scale flow field analysis. For the numerical method, the Reynolds-Averaged Navier-Stokes (RANS) equations coupling with the k-ɛ turbulence model are solved. The result indicates that high shear stress exists around the leading and trailing edges of impeller blades and there is a jet at the outlet of impeller, and the blade leading and trailing edge, and the outlet of the impeller are the dominant regions for higher hemolysis occurrence. It is also noted that the presence of an interventional blood pump generates significant vortex structures within the aorta. To effectively reduce the hemolysis index, back-sweep concept is applied to this study also optimize the impeller’s leading edge. The analysis result confirms that the back swept leading edge of impeller blade helps improve the blood compatibility for interventional blood pumps.
Numerical analysis of performance and internal flow characteristics of a gas-liquid multiphase rotodynamic pump
Authors: Yang Jiahang , Li Huichuang , Liang Ao , Hu Liwei , Zhang Wenwu 
Published: October 2024

Abstract
Inlet Gas Void Fraction (IGVF) and rotating speed are key parameters influencing the flow characteristics of gas-liquid multiphase pumps. To explore the influence of these two factors on the flow characteristics of gas-liquid multiphase rotodynamic pumps, CFD simulations were carried out based on the Euler two-fluid model to analyze the flow characteristics in an axial-flow pump at three different rotating speeds (1450 r/min, 2200 r/min, 2950 r/min) with different IGVFs. The numerical results indicate that the pump efficiency and head are first increased and then decreased with the increase of IGVF. When the IGVF is 5%, the head and efficiency reach their maximum values. This is attributed to the minimum vorticity and turbulence kinetic energy in the impeller passage at IGVF= 5%, and the small vortex range at the hub of the guide vane, thus resulting in the stable two-phase flow state in the impeller and guide vane. At the same IGVF, with the increase of the rotating speed, the head and efficiency of the multiphase pump increase accordingly. This is closely related to the smallest vortex range formed by gas-liquid flow separation at n=2950 r/min, indicating a better flow state.
Role of wall roughness on the energy performance for a mixed flow pump with tip clearance
Authors: Han Bingfu , Tan Lei , Han Yadong 
Published: October 2024

Abstract
This study delves into the intricate influence of wall roughness on the mixed flow pump energy performance, particularly focusing on the simultaneous presence of tip clearance. Utilizing a well-performing mixed flow pump with a tip clearance of 0.8 mm as the subject of investigation, the research employs numerical simulation at different roughness to comprehensively analyse the effects of wall roughness on pump head, efficiency, and cavitation performance. The numerical simulation employs the SST k-ω model and the equivalent sand-gain roughness model to simulate the turbulent flow account for wall roughness. The findings discerned that both head and efficiency are inversely related to wall roughness, with decrements amplified at elevated flow rates. Notably, the ‘hump’ in head performance near 60% of the design flow rate is significantly influenced by roughness beyond 31.6μm. Additionally, efficiency exhibits a minor uptick at 0.56μm roughness before a subsequent decline. The study also highlights the multifaceted impact of roughness on the internal flow structures, including vortex and cavitation patterns. These insights emphasize the importance of balancing roughness levels to enhance energy efficiency and cavitation resistance, crucial for the practical application and long-term reliability of such machinery.
Study on cavitation characteristics of a waterjet pump under off-design conditions
Authors: Zou Xingke , Guo Qiang , Huang Xianbei 
Published: October 2024

Abstract
Water jet pump is widely used in power field, and ordinary axial impeller is the key component of energy conversion. Because of the existence of tip clearance, the tip leakage flow through the clearance is inevitably accompanied by energy loss. Taking the axial-flow water jet pump as the research object, the condition is that the pump runs under the condition of deviating from the design condition. Considering the influence of vortex and cavitation, the improved numerical model is used to simulate the internal flow field. SST-CC turbulence model considering rotation correction and modified Zwart cavitation model based on vortex identification correction are selected. The cavitation performance and Vortex characteristics under off-design conditions are analyzed. The results show that flow loss is mainly reflected in turbulence dissipation and wall dissipation, which the turbulence dissipation and wall dissipation of impeller section account for the largest proportion. Because the cavitation area of water jet pump is mainly concentrated in the impeller, the turbulent dissipation is mainly related to the characteristics of turbulence kinetic energy and turbulent vortex. The research results can provide an effective basis for the analysis and design of axial-flow water jet pump.
Study on the inlet backflow characteristics and particle deposition of screw mixed-flow deep-sea mining pump under small flow conditions
Authors: Rennian Li , Dengxue Ma , Zhengjing Shen , Fengyi Jiang , Liuhao Liu , Wei Han 
Published: October 2024

Abstract
When a screw mixed-flow deep-sea mining pump operates under small flow conditions, significant backflow occurs at the impeller inlet and in the inlet pipe, which seriously affects the pump performance. To investigate this backflow characteristic, this paper presents a numerical study of the internal flow field of the mining pump based on the CFD-DEM coupling method. The flow state at the impeller inlet, the velocity distribution law in the inlet pipe, and the particle motion state under the flow rate condition of 0.52Qd
are obtained. The results show that, when the pump operates under small flow conditions, the leakage from the tip gap of the impeller head causes a screw high-speed backflow with the same rotation direction as the impeller on the wall of the inlet pipe. The backflow intensity attenuates as it propagates towards the pump inlet. The backflow mixes with the main flow in the middle of the pipe and reaches a balanced state, which causes the particles to deposit here. The deposition process can be divided into a formation stage and a stable stage. When the particles in the middle of the pipe reach the stable stage, their shape and position become stable. The velocity pulsation of the monitoring points near the wall is periodic, and its pulsation frequency is the same as the impeller rotation frequency.
Jet centrifugal pump internal flow numerical simulation and structural optimization
Authors: Mao Weibin , Ge Jie , Ren Bing , Gui Jianhui , Yang Xuelong 
Published: October 2024

AbstractJet centrifugal pump is essential equipment in multiple systems such as agricultural irrigation and energy production. This paper investigates the internal flow characteristics of jet centrifugal pumps at different flow rates and the cavitation behavior under high flow conditions by numerical simulation methods. Additionally, two performance optimization strategies are proposed based on simulation results. The findings indicate that high-velocity regions and low-pressure zones exist within the nozzle. As flow rate increases, the outlet velocity of the nozzle gradually decreases, and large areas of low pressure are observed near the inlet of the impeller. Cavitation occurs to varying degrees at flow rates of 4.056 m3/h and 3.840 m3/h. The turbulent kinetic energy contours for these conditions reveal uneven distribution within the jet nozzle, with higher values near the jet mixing layer, inner wall of the jet nozzle and impeller inlet. Structural optimization using hemispherical bolts significantly reduces the turbulent kinetic energy around the bolts, resulting in an increase in head ranging from 1.68% to 6.70% across various flow rates. Shortening the clearance between the impeller and the rear cover reduces energy losses, leading to an increase in head ranging from 2.72% to 5.86%.
Solid-liquid flow characteristics of twin-screw pump under solid-containing transportation
Authors: Wang Zhenhao , Sun Shuaihui , Guo Pengcheng , Ma Jinyang 
Published: October 2024

Abstract
Twin-screw pumps have the wear risk when the fluid contains particles. In order to clarify the flow characteristics of the twin-screw pump under solid-containing transportation, the solid-liquid flow characteristics research on a twin-screw pump are carried out using numerical simulation and experimental methods in this paper. The results show that the particle concentration has a small effect on the volumetric efficiency and hydraulic efficiency of the twin-screw pump under each differential pressure, but the presence of particles could increase the volumetric efficiency limitedly. The velocity of main flow and the turbulent kinetic energy have been restrained by the particles in the tooth chamber, and the inhibition phenomenon is more significant with the increase of particle concentration. The particles in the tooth chamber are inhaled by the leakage flow at the tooth-tip clearance. Some particles hit the tooth-tip and cause the abrasion, others flow into the tip clearances, which decreases the leakage flow velocity and results in a higher volumetric efficiency than that of the pure-liquid condition. The results of the study will provide a theoretical basis for the study of solid-containing transportation and particle wear in twin-screw pumps.
Numerical Study on Pressure Fluctuation in Electric Coolant Pump
Authors: Zhang Lin , Zhu Dongdong , Gu Yandong , Zhou Zhiqiang , Ouyang Xili , Bian Junjie 
Published: October 2024

Abstract
Adjusting the flow rate of an electronic coolant pump (ECP) over a wide range can cause significant internal pressure fluctuations, leading to vibration and noise. This study uses numerical simulation to compare pressure fluctuations at the backflow orifice and within the impeller of an ECP at various flow rates. The backflow creates periodic disturbances in the impeller inlet region. As the flow rate increases, the axial influence range of the backflow on the impeller inlet decreases, reducing the amplitude of pressure fluctuations by up to 7.9%. The characteristic frequencies of pressure fluctuations at the backflow orifice include the blade passing frequency and its first harmonic. Within the impeller, the pressure fluctuation amplitude increases with both flow direction and flow rate, with characteristic frequencies encompassing the rotational frequency, BPF, and its first harmonic. At low flow rates, the overall variation of pressure fluctuations inside the impeller shows an opposite trend compared to design and high flow rates. The impact of the rotational frequency on pressure fluctuations inside the impeller is significantly smaller at the design flow rate than at other flow rates. This study offers insights that can help optimize ECP design and enhance their operational performance.
Analysis of submersible axial flow pump fitted with variable IGV at design and off-design conditions
Authors: Sonawat Arihant , Hwang Do-Hyun , Kim Youn-Sung 
Published: October 2024

Abstract
Submersible axial flow pump is capable of generating large flow rate at high efficiency and is widely used in agriculture, irrigation, water supply and drainage in factories, urban areas, etc. Pumps are always designed to operate at the designed conditions of flowrate and head, but in certain practical applications, their off- design operation seems to be more important, like if there is waterflooding due to heavy rainfall or in case of variable flowrate, variable head operations or long-distance water supply. These situations arise for limited operation (time) and hence it is not economical to change the existing pumping system. The present work deals with the analysis of submersible axial flow pump at design as well as off-design conditions. This off-design operation was controlled by the variable inlet guide vane (VIGV) with the task of making it energy efficient for all conditions. The scope of this work was to investigate the performance of selected pump at designed rotational speed, at designed flowrate (Q/Qd
=1) as well as Q/Qd
=0.8 and Q/Qd
=1.2, using Computational Fluid Dynamics (CFD) and at various VIGV angles in the range of ±25°. The fluid flow analysis was performed using commercial CFD tool ANSYS CFX v17.0. From the numerical study, it was concluded that the performance of the considered AFP significantly increased due to the presence of VIGV at positive rotation angles. The best performance was observed for IGV angle of +25° for all flowrates. As compared to the reference case of 0° IGV rotation, the performance of the AFP increased by 28.42% in terms of head ratio and 0.235% in terms of hydraulic efficiency, for +25° IGV angle, at the designed flowrate. Also, an increment of 69.05% in terms of head ratio and 14.49% in terms of hydraulic efficiency was observed at overload condition of Q/Qd
=1.2.
Signals denoising of leakage pressure in water supply pipelines using an improved wavelet filter algorithm
Authors: Wu Luochang , Wang Sai , Yan Jianguo 
Published: October 2024

Abstract
Accurate identification of leakage pressure signal is crucial for leakage detection and location of water supply pipelines. However, there is a lot of noise signals in the negative pressure waves generated during leakage accidents, making it difficult to identify leakage signals, and thus seriously affecting the accuracy of leakage detection. Therefore, in this study, we carried out leakage test of water transmission pipeline on our self-built test platform for transient flow with long-distance water transmission pipeline (pipeline length is 160 m, and diameter is 100 mm), and obtained the transient leakage pressure signals under various flow rates (15–55 m3/h). An improved wavelet filtering algorithm was proposed to filter the leakage pressure signal by optimizing the calculation of decomposition layers and the threshold processing strategy, and then compared with the traditional wavelet filtering method. The results show that the improved algorithm can denoise the leakage signals effectively, and the signal-to-noise ratio (SNR), mean square error (MSE) and mean absolute percentage error (MAPE) are all superior to those of the traditional wavelet algorithm. The results can provide support for leakage detection and location of water supply pipeline systems.
The Optimization Strategy of Pump-Valve Combined Scheduling and Pump Unit Reselection in Heating Systems
Authors: Li Chen , Qiu Baoyun , Yan Tianxu , Wang Huijie , Zhao Fangling , Qi Guipeng 
Published: October 2024

Abstract
This research successfully implemented time and spatial division control for residential heating through theoretical analysis and optimization, with the goal of meeting occupants’ comfort requirements and achieving energy savings and emissions reduction. Firstly, the investigation calculated the optimal heating capacity for different functional areas within the buildings at various times. Secondly, by considering the heat transfer characteristics of the heating system, as well as pipe and valve resistance properties, and the performance of the centrifugal pump, the research established a system heat balance equation and a combined system hydraulic balance equation incorporating frequency conversion and valve adjustment to meet precise heating demands. Finally, the investigation reselected the pump based on the actual flow rate and head of the pump station unit. The heating optimization calculations were applied to a residential building in Zhengzhou, revealing that the combined optimization of frequency conversion and valve adjustment, along with the optimized selection of pump station units, resulted in energy consumption savings of 38% and 33% reduction in heating output compared to the original design. The overall operating costs were correspondingly reduced by 32%. Thus, this research suggests that optimizing the heating system through the joint adjustment of pumps and valves can achieve energy efficiency while delivering precise heating to fulfill occupants’ comfort requirements.
Study on Fault Prediction Method of Hydropower Equipment Based on Equipment Health State Detection
Authors: Sun Y X , Zhao X 
Published: October 2024

Abstract
With the continuous development of China’s electric power industry, the installed capacity of power plants is increasing, and hydropower units are developing in the direction of large capacity and high efficiency. As the complexity of the equipment is getting higher and higher, different equipment are more and more different, showing different characteristics when faults occur, which puts forward higher requirements for the safe and stable operation of hydropower units. In response to the above problems, this paper develops a set of human-machine closed-loop remote fault diagnosis reasoning machine system with self-learning function and a set of equipment health state monitoring and prediction system. This remote fault diagnosis system reasoning machine system can reduce the cost of unit equipment fault diagnosis, improve the diagnosis efficiency, and ensure the safe, stable and economic operation of the unit.