Excitation force on a pump-jet propeller: The effect of the blade number

Zhang, Y.; Han, Jieting; Huang, Bin; Zhang, Dahai; Wu, Dazhuan

doi:10.1016/j.oceaneng.2023.114727

Cited by 14 publications

(4 citation statements)

References 39 publications

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Section: Methodsmentioning

confidence: 99%

“…While modeling turbulent flows in the Navier-Stokes equation, the instantaneous velocity is replaced by the sum of the Reynolds averaged velocity and the pulsating component of the velocity. The dependence (1) takes the following form [26]: In the course of the research, the ANSYS CFX software was used to record the values of the flow rate Q (m 3 /h), the torque on the pump impeller M (N•m), and the fluid velocity at the outlet and inlet of the pump v 2 and v 1 (m/s). The values of head H (m), useful power N u (W), power consumed by the pump N c (W), and the efficiency η were calculated depending on the following parameters:…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Development of a High-Rotational Submersible Pump for Water Supply

Kondus,

Pavlenko,

Kulikov

et al. 2023

Water

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Submersible pumps are the leading electricity consumers in centralized water supply systems. Considering the cost structure of the life cycle of pumping equipment, the main costs should include investment costs, electricity costs during operation, and costs of repairing pumping equipment. Considering the growing cost of electricity in the world, the cost of manufacturing pumping equipment is significantly increasing, which in turn causes an increase in its price. The key factor in increasing the competitiveness of such equipment on the market is its modernization with the achievement of a higher level of energy efficiency with a simultaneous reduction in cost due to a reduction in weight and dimension parameters. In the research, a significant increase in the head from 15 m to 65 m of the submersible pump stage was achieved by increasing the rotation frequency from 3000 rpm to 6000 rpm and designing the pump for this rotation frequency. As a result, the pump head, created by the flowing part with the basic stage (eight pieces), can be provided by the pump using only two designed stages. It creates the prerequisites for reducing the mass of the pump from 200 kg to 45 kg, or by 77.5%. Also, in designing the pump, energy efficiency was increased from 74.6% (for the existing pump) to 79.4% (by 5% for the developed pump). The research results made it possible to significantly contribute to reducing the cost of the life cycle of the submersible pump installation.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Development of a High-Rotational Submersible Pump for Water Supply

Kondus,

Pavlenko,

Kulikov

et al. 2023

Water

View full text Add to dashboard Cite

show abstract

“…The unsteady simulation revealed the relationship between the unsteady dynamic performance caused by the tip clearance and the pressure pulsation around the underwater vehicle. Zhang [18,19] studied the influence of blade number on the propulsion performance and excitation force of pump-jet propulsor by computational fluid dynamics method, and theoretically and numerically studied the excitation force generation mechanism of pump-jet propulsor ( PJP ) with uniform spacing and non-uniform spacing rotor blades ( ESB and UESB ) after standard submarine model. Some scholars have studied the parameter optimization method of water-jet propeller : Shi [20][21][22] compared the unsteady force spectrum and velocity spectrum characteristics of pump-jet with the characteristics of single rotor and ducted propeller to reveal the influence of duct and pre-swirl stator ; the flow-induced vibration and acoustic radiation characteristics of pump jet in water tunnel are studied.…”

Section: Research Status Of Hydraulic Performance Optimization Of Wat...mentioning

confidence: 99%

Research on Hydraulic Optimization Design Method of Water-Jet Propulsion Pump Considering Hump Index

Long,

Zheng,

Han

et al. 2024

Preprint

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In order to improve the efficiency of water-jet pump and reduce or eliminate the hump phenomenon, it is necessary to optimize the impeller design. In this paper, the optimization of water-jet propulsion pump is studied by combining numerical simulation and experiment.The orthogonal optimization design scheme is established. Based on the numerical simulation method, the hydraulic performance indexes such as energy coefficient, torque coefficient and efficiency of the design points of different design schemes are obtained. The final optimization design is completed by further optimizing the profile and spatial position of the optimal efficiency factor level combination A2B1C1D1 at different spanwise heights.Then, based on the results of numerical simulation by CFX, using Python and LabVIEW programming software, a pump flow head curve fitting and hump judgment program is developed, which can realize the function of curve fitting of flow head, giving the position of trough and peak, and calculating the value of hump climbing coefficient Chump. The influence of different blade structure parameters on the hydraulic performance and energy characteristic curve hump of the water-jet pump is analyzed, and the optimization design of the high-performance water-jet pump considering the hump index is completed. In summary, This method is not only applicable to the hydraulic optimization of the water-jet propulsion pump, but also the research results can provide theoretical basis and technical support for the high-performance and low-vibration design of the water jet propulsion pump.

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“…Compared with the traditional propeller propulsion method [1], water-jet pumps have high propulsion efficiency, low vibration and noise, good maneuverability, low underwater acoustic signal, strong adaptability to changing operating conditions as well as good anticavitation performance when running at high speed, and is widely used in high-speed, high-performance ships, amphibious vehicles, and other vehicles [2]. In recent years, more and more people have been involved in the research of water-jet pumps, mainly focusing on the propulsion performance of water-jet pumps [3][4][5], cavitation performance [6][7][8], optimization analysis [9][10][11], etc., and considerable progress has been made. However, during the practical operation of the water-jet pump, the variable speed condition will cause strong transient performance changes, which will have a negative impact on the thrust, cavitation performance, internal flow field, pressure pulsation, etc., thus affecting the stable operation of the ship.…”

Section: Introductionmentioning

confidence: 99%

Transient Hydrodynamic Characteristics of a High-Speed Axial Flow Water-Jet Pump during Variable Speed Process

Zhu,

Shi,

Gan

et al. 2023

JMSE

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To investigate the transient characteristics of high-speed axial flow water-jet pumps during start-up and emergency acceleration as well as to analyze how different accelerations affect the performance of internal flow, the k–ω turbulence model of the SST model and Zwart cavitation model were used to perform unsteady simulation on an impeller rotating at a speed of 1850. The steady-state numerical simulation method was verified by the experimental data, the numerical calculation results were basically consistent with the experimental data, the margin of error was within 5%, and the numerical simulation method was reliable. The results show that there was an obvious transient effect in the process of variable speed, and the thrust reached a stable state later than the speed. The buffer times for start-up times of 1 s, 2 s, and 3 s were 0.0394 s, 0.0375 s, and 0.0282 s, respectively, and the buffer times for the acceleration times of 0.5 s, 1.0 s, and 1.5 s were 0.0330 s, 0.0273 s, and 0.0230 s, respectively. The greater the acceleration, the more serious the flow rate and thrust lag behind the speed, and the greater the impact thrust. Under the same acceleration, the buffer time required in the start-up process was 19.3~22.6% longer than that in the acceleration process. During the change in speed of the high-speed water-jet pump, the vortex core area of the suction surface (SS) first appeared on the side of the shroud at the inlet, increased with the increase in the rotational speed, and developed toward the middle of the impeller. However, after the flow was stabilized, the vortex core region gradually shrank and eventually disappeared. When the rotational speed reached 0.6 times the design speed, cavitation occurred at the leading edge (LE) of the blade, and the cavitation area increased with the increase in the rotational speed. When reaching the same speed, the greater the acceleration, the more serious the cavitation. Under the design speed, that is, 6000 r/min, the cavitation volume fraction of the 1 s start-up process was 7.32%, the 2 s start-up process was 5.84%, the 3 s start-up process was 5.32%, and the 0.5 s acceleration process was 6.86%. The cavitation volume fraction of the 1 s acceleration process was 5.04%, and that of the 1.5 s acceleration process was 4.23%. Under the same acceleration, the cavitation volume fraction of the start-up process was 6.7~25% larger than that of the acceleration process. Compared with the start-up process and acceleration process under the same acceleration, the accelerated process had a smaller region of vortex core, stronger anti-cavitation ability, and more stable flow than the start-up process. During the actual operation process of the water-jet pump, it is advisable to use smaller accelerations and segmented accelerations as much as possible until the design speed is reached. The research findings serve as a foundation for future investigations into the transient characteristics of high-speed water-jet pumps operating under variable speed conditions.

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Excitation force on a pump-jet propeller: The effect of the blade number

Cited by 14 publications

References 39 publications

Development of a High-Rotational Submersible Pump for Water Supply

Development of a High-Rotational Submersible Pump for Water Supply

Research on Hydraulic Optimization Design Method of Water-Jet Propulsion Pump Considering Hump Index

Transient Hydrodynamic Characteristics of a High-Speed Axial Flow Water-Jet Pump during Variable Speed Process

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