Numerical and experimental study of the self‐priming process of a multistage self‐priming centrifugal pump

Wang, Chuan; He, Xiaoke; Zhang, Desheng; Hu, Bo; Shi, Weidong

doi:10.1002/er.4497

Cited by 40 publications

(31 citation statements)

References 14 publications

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“…e results could help to establish the design requirements for a waterjet-propelled ship type. e design and optimization method of the inlet passage is an important part of the hydraulic optimization of the waterjet propulsion system, and its hydraulic performance directly affects the overall performance of the waterjet propulsion system [38][39][40]. e uneven outflow of the inlet passage will cause periodic pulsation of the propulsion pump, induce vibration, and reduce the efficiency of the propulsion pump.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Inlet Passage for Waterjet Propulsion System Based on Flow and Geometric Parameters

Jiao

Cheng

Zhang

et al. 2019

Advances in Materials Science and Engineering

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As an important overcurrent component in a waterjet propulsion system, the inlet passage is used to connect the propulsion pump and the bottom of the propulsion ship. e anticavitation, vibration, and noise performance of the waterjet propulsion pump are significantly affected by the hydraulic performance of the inlet passage. e hydraulic performance of the inlet passage directly affects the overall performance of the waterjet propulsion system, thus the design and optimization method of the inlet passage is an important part of the hydraulic optimization of the waterjet propulsion system. In this study, the hydraulic characteristics of the inlet passage in the waterjet propulsion system with different flow parameters and geometric parameters were studied by a combination of numerical simulation and experimental verification. e model test was used to verify the hydraulic characteristics of the waterjet propulsion system, and the results show that the numerical results are in good agreement with the test results. e numerical results are reliable. e hydraulic performance of the inlet passage is significantly affected by the inlet velocity ratio.ere is a certain correlation between the hydraulic performance of the inlet passage and ship speed, and the hydraulic performance of the inlet passage is limited by ship speed. e geometric parameters of the best optimization case are as follows: the inflow dip angle α is 35°, the length L is 6.38D 0 , and the upper lip angle is 4°. e optimal operating conditions are the conditions of IVR 0.69-0.87.

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Section: Introductionmentioning

confidence: 99%

Optimal Design of Inlet Passage for Waterjet Propulsion System Based on Flow and Geometric Parameters

Jiao

Cheng

Zhang

et al. 2019

Advances in Materials Science and Engineering

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“…In combination with Equations (19), (21) and (23), the incremental equations of the hydraulic transmission part can be deduced when the system makes small disturbance motion near the working point A.…”

Section: Incremental Transfer Model Of Hydraulic Transmission Partmentioning

confidence: 99%

“…Zhang et al [17] studied the control strategy of a hydraulic shaking table based on its structural flexibility. Qian and Wang et al [18,19] researched the effects of important elements, such as valves [20][21][22], pumps [23][24][25][26] and rotors [27], on stability. The influence of excitation forces on the vibration of a pump and measures of noise reduction were studied by Ye et al [28,29].…”

Section: Introductionmentioning

confidence: 99%

Absolute Stability Condition Derivation for Position Closed-Loop System in Hydraulic Automatic Gauge Control

et al. 2019

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In the metallurgical industry, hydraulic automatic gauge control (HAGC) is a core mechanism for thickness control of plates used in the rolling process. The stability of the HAGC system’s kernel position closed-loop is key to ensuring a process with high precision, speed and reliability. However, the closed-loop position control system is typically nonlinear, and its stability is affected by several factors, making it difficult to analyze instability in the system. This paper describes in detail the functioning of the position closed-loop system. A mathematical model of each component was established using theoretical analysis. An incremental transfer model of the position closed-loop system was also derived by studying the connections between each component. In addition, based on the derived information transfer relationship, a transfer block diagram of disturbance quantity of the system was established. Furthermore, the Popov frequency criterion method was introduced to ascertain its absolute stability. The results indicate that the absolute stability conditions of the position closed-loop system are derived in two situations: when spool displacement is positive or negative. This study lays a theoretical foundation for research on the instability mechanism of an HAGC system.

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“…It is well known that pumps have huge energy consumption, and wall roughness has an important effect on pump efficiency [11][12][13][14][15][16]. In the process of using the double-channel sewage pump, the abrasion of the wall surface caused by the impurities in the transport medium and the damage of the blade surface caused by erosion will cause the change of the wall roughness, and roughness Ra is one of the important factors affecting the performance of the pump.…”

Section: Introductionmentioning

confidence: 99%

Influence of Critical Wall Roughness on the Performance of Double-Channel Sewage Pump

Zhang

Wang

et al. 2020

Energies

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The numerical method on a double-channel sewage pump was studied, while the corresponding experimental result was also provided. On this basis, the influence of wall roughness on the pump performance was deeply studied. The results showed that there was a critical value of wall roughness. When the wall roughness was less than the critical value, it had a great influence on the pump performance, including the head, efficiency, and shaft power. As the wall roughness increased, the head and efficiency were continuously reduced, while the shaft power was continuously increased. Otherwise, the opposite was true. The effect of wall roughness on the head and hydraulic loss power was much smaller than that on the efficiency and disk friction loss power, respectively. With the increase of wall roughness, mechanical efficiency and hydraulic efficiency reduced constantly, leading to the decrement of the total efficiency. With the increase of flow rate, the effect of wall roughness on the head and efficiency gradually increased, while the influence on the leakage continuously reduced. The influence of the flow-through component roughness on the pump performance was interactive.Energies 2020, 13, 464 2 of 20 Literature OverviewIn the past years, many scholars studied the effect of wall roughness on the flow in pipes, fans, compressors, microchannels. In order to study the effect of wall roughness in turbulent pipe flow, Hemeida [17] developed an equation for estimating the thickness of the laminar sublayer in turbulent pipe flow of pseudoplastic fluids and found that the turbulent pipe flow could be divided into two regions: smooth wall and rough wall turbulence. The roughness Reynolds number was used to determine the smooth wall turbulence and rough wall turbulence regions. Kandlikar [18] studied the roughness effects at microscale-reassessing Nikuradse's experiments on liquid flow in rough tubes, and found that Nikuradse's work was revisited in light of the recent experimental work on roughness effects in microscale flow geometries. Li et al. [19] studied the influence of the internal surface roughness of the nozzle on cavitation erosion characteristics of submerged cavitation jets from the aspects of erosion intensity and erosion efficiency; it could be concluded that excessive smooth surface was not conducive to the formation of cavitation bubbles, leading to an attenuated intensity of cavitation erosion, while excessive rough surface caused much energy dissipation and led to divergent jets, resulting in a significant reduction of erosion intensity. According to the experimental results, there existed an optimum inner surface roughness value to achieve the strongest aggressive cavitation erosion capability for submerged cavitating jets. Tang et al. [20] analyzed the existing experimental data in the literature on the friction factor in microchannels. The friction factors in stainless steel tubes were much higher than the theoretical predictions for tubes of conventional size. This discrepancy resulted from the large rel...

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Numerical and experimental study of the self‐priming process of a multistage self‐priming centrifugal pump

Cited by 40 publications

References 14 publications

Optimal Design of Inlet Passage for Waterjet Propulsion System Based on Flow and Geometric Parameters

Optimal Design of Inlet Passage for Waterjet Propulsion System Based on Flow and Geometric Parameters

Absolute Stability Condition Derivation for Position Closed-Loop System in Hydraulic Automatic Gauge Control

Influence of Critical Wall Roughness on the Performance of Double-Channel Sewage Pump

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