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Research Papers: Fluid-Structure Interaction

Transient Characteristics of a Closed-Loop Pipe System During Pump Stopping Periods

[+] Author and Article Information
Dazhuan Wu

Institute of Process Equipment,
Zhejiang University,
38 Zheda Road,
Hangzhou 310027, China
e-mail: wudazhuan@zju.edu.cn

Peng Wu

Institute of Process Equipment,
Zhejiang University,
38 Zheda Road,
Hangzhou 310027, China
e-mail: roc@zju.edu.cn

Shuai Yang, Leqin Wang

Institute of Process Equipment,
Zhejiang University,
38 Zheda Road,
Hangzhou 310027, China

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 14, 2013; final manuscript received September 9, 2013; published online January 7, 2014. Assoc. Editor: Chong-Shien Tsai.

J. Pressure Vessel Technol 136(2), 021301 (Jan 07, 2014) (8 pages) Paper No: PVT-13-1066; doi: 10.1115/1.4025616 History: Received April 14, 2013; Revised September 09, 2013

In order to study the transient characteristics of a closed-loop pipe system with room temperature water, experiments were carried out based on different pump stopping periods from rate rotational speed to zero. Various stopping periods were realized by changing the rotational inertia of the rotors, controlling the frequency of the motor and braking the shaft. Experimental results of different operating schemes were compared, and transient flow rate of the pipe system and transient characteristics of the pump were analyzed. The influences of the kinetic energy of the loop fluid and pump rotors to the stopping periods were summarized. Results show that rapid change of the pump operating conditions occurs during the stopping period and transient flow rate of the pipe system and characteristics of the pump depend largely on the way of stopping. The kinetic energy stored in the pump can drive the impeller keeping rotating for more time after the motor is shutdown. Due to the kinetic energy stored in the loop pipe, the flow rate does not reach zero immediately after the rotational speed reaches zero. The inertia of pump rotor and fluid inertia affect the impact of fluid flow and the duration of the loop during pump stopping period.

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References

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Figures

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Fig. 1

Schematic view of the experimental setup (the unit is mm)

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Fig. 2

Schematic view of the pump

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Fig. 3

General view of the pump and drive system

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Fig. 4

Steady-state performance of the pump

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Fig. 5

Nondimensional steady-state performance curves

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Fig. 6

Transient performance curves during the shaft locked period

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Fig. 7

Curves of Cq versus Ch during the shaft locked stopping period

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Fig. 8

Transient performance curves of the frequency control stopping

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Fig. 9

Curves of Cq, Ch, and KEf versus time during the frequency control stopping periods

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Fig. 10

Transient performance curves of the coastdown periods

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Fig. 11

Curves of KEf, KEp, and ε versus time during the coastdown periods

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Fig. 12

Curves of Cq versus Ch under different stopping schemes

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Fig. 13

Flow curves for different stopping periods

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