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CSME 2021/08
Volume 42 No.4
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371-380
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The Effect of Downtime on Non-inertial Stopping Performance under Special Working Conditions
Yan-Juan Zhao a, Yu-Liang Zhangb and Feng-Lin Zhou
aCollege of Information Engineering, Quzhou College of Technology, Quzhou 324000, China.
bCollege of Mechanical Engineering & Key Laboratory of Air-driven Equipment Technology of Zhejiang Province, Quzhou University, Quzhou, 324000, China.School of Mechanical Engineering, Hunan University of Technology, Zhuzhou, 412007, China.
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Abstract:
In this study, the non-inertial stopping behavior of a self-priming pump under shut-off and ultra-small-flowrate conditions is experimentally investigated, and the effect of downtime on such behavior is also examined. Transient characteristics in the non-inertial stopping process are deeply revealed through a dimensionless analysis. Results show that the non-inertial stopping process is prone to drop delay of rotating speed at the end of this process when the downtime is short. The non-inertial stopping process is prone to flowrate sudden drop at the end of this process when the downtime is long. Moreover, drop lag in flowrate is a common phenomenon in the early stage of the non-inertial stopping process. The three dimensionless coefficients have the minimum values in the early stage of the non-inertial stopping process then remain approximately unchanged and rapidly increase to the maximums at the end of the stoppings. The extent to which parameters are affected in the non-inertial stopping process is from heavy to light in the order of the head, shaft power, and flowrate. The similarity law of pump can be applied to the performance prediction of transient operating processes with long downtime.
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Keywords: self-priming pump, shut-off condition, non-inertial, transient performance, dimensionless analysis.
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©
2021
CSME , ISSN 0257-9731
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