Non-inertial stopping characteristics of a prototype pump

Zhang, Yuliang; Zhu, Zuchao; Li, Wenguang; Jia, Xiaoqi

doi:10.1177/1687814019844649

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…The dimensionless volumetric flowrate, dimensionless head, and dimensionless shaft power are now used to further reveal the transient characteristics of PAT during atypical startup [28]. These three non-dimensional parameters are defined below.…”

Section: Dimensionless Analysismentioning

confidence: 99%

Effect of valve opening on starting performance of pump as turbine

Zhang,

Li,

Zheng

2023

PLoS ONE

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The study on transient characteristics of pump as turbines during atypical startup has not been deeply explored yet. In order to reveal the transient characteristics of a small centrifugal pump reversing as turbine during startup process in this paper, the transient hydraulic performance experiments are conducted for three steady rotational speed cases. Under the condition of each case, three, five and, three valve opening scenarios are completed to measure the performance. The dimensionless analysis are also employed so as to better reveal transient behavior of the pump as turbine during atypical startup. The results show that the rise rate of each performance parameter is different, wherein the shaft power and rotational speed have the fastest rising rate, followed by the flow rate, and the head rise is the slowest. It is clearly seen that the shock phenomenon in static pressure easily occurs at the outlet of pump as turbine. With the increase of valve opening, the dimensionless flow rate, head and, power coefficient all show the evolution trend of gradually increasing.

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Section: Dimensionless Analysismentioning

confidence: 99%

Effect of valve opening on starting performance of pump as turbine

Zhang,

Li,

Zheng

2023

PLoS ONE

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“…To investigate the startup process in self-priming pumps, many scholars have performed geometric modeling. Zhang et al experimentally investigated the transient hydraulic performance of a self-priming pump during startup and shutdown, [6][7][8][9] and found that the starting speed of the impeller had a particular effect on the hydraulic performance, with the degree of influence being related to the flow rate, rotation speed, and head. When shutting the self-priming pump down, a shorter shutdown time produced a more significant delay in the reduction in rotation speed at the end of the non-inertial stop.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the self‐priming process of a prototype pump based on coupled calculations of circulatory system

Zhang,

Li,

Zhao

et al. 2024

Energy Science & Engineering

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To understand the self‐priming characteristics of a self‐priming pump, a closed‐loop piping system that includes the self‐priming pump, valve, tank, and piping system is established. The acceleration–constant speed operation processes of the impeller are controlled through a user‐defined function that ensures that the computational model and startup conditions are consistent with the real situation. Based on numerical calculations of the self‐priming process with two different self‐priming heights, the gas–liquid distributions during the self‐priming startup process are obtained. The results show that the self‐priming startup process can be divided into three stages: rapid inhalation, oscillating exhaust, and accelerated exhaust. Under the two self‐priming heights, the time required for the rapid inhalation and accelerated exhaust stages is basically the same. Thus, the difference in self‐priming time is mainly concentrated in the oscillating exhaust stage. The rate at which the liquid level rises in the vertical pipe is not proportional to the self‐priming height, and the difference in the self‐priming time is not proportional to the change in the self‐priming height.

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“…The flow field in the device is very complex, being mainly caused by the change in the flow direction. Zhang et al [29] experimentally studied the non-inertial stopping transition of centrifugal pumps. It was found that the shorter the stopping time of the centrifugal pump was, the more pronounced the delayed phenomenon of the speed drop at the end of the non-inertial stopping would be.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Shutdown Transitions of the Full-Flow Pump and Axial-Flow Pump

Jiao,

Shan,

Yang

et al. 2023

JMSE

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In this study, a comparative analysis of the shutdown transitions of a full-flow pump and an axial-flow pump was carried out through numerical simulation and model tests. The UDF method was used to achieve control of the impeller rotational speed during shutdown. The results show that during the shutdown transition, the rate of decline of rotational speed, flow rate, and torque of the axial-flow pump are greater than those of the full-flow pump, so the axial-flow pump stops faster than the full-flow pump. The axial force of the axial-flow pump is significantly lower than that of the full-flow pump, and the maximum value of the radial force of the axial-flow pump is approximately 1.14 times that of the full-flow pump. Due to the influence of the clearance backflow vortex, the impeller inlet and outlet of the full-flow pump generate clearance backflow vortices in the near-wall area, resulting in the overall flow pattern of the impeller chamber being worse than that of the axial-flow pump and the hydraulic loss being greater than that of the axial-flow pump. The runaway speed and flow rate of the axial-flow pump are higher than those of the full-flow pump. Due to the influence of the clearance backflow, the range of the high entropy production rate at the suction side of the impeller of the full-flow pump is always larger than that of the axial-flow pump. The research results in this paper can provide theoretical support for the selection and operation of pumps in large low-head pumping stations.

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Non-inertial stopping characteristics of a prototype pump

Cited by 6 publications

References 19 publications

Effect of valve opening on starting performance of pump as turbine

Effect of valve opening on starting performance of pump as turbine

Numerical study of the self‐priming process of a prototype pump based on coupled calculations of circulatory system

Comparison of the Shutdown Transitions of the Full-Flow Pump and Axial-Flow Pump

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