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Experimental study on pressure fluctuation characteristics of gas–liquid flow in liquid ring vacuum pump

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Abstract

To accurately grasp the transient characteristics of complex gas–liquid flow in liquid ring vacuum pump, an experimental test system was established for the characteristics of pressure fluctuation in pump. The pressure fluctuation characteristics and its excitation mechanism at different circumferential positions of pump casing inner wall under different operating conditions were investigated. The results show that there is a strong correlation between the time-domain characteristics of pressure fluctuation on the casing inner wall and the variation of pump hydraulic performance during the start-up period. Due to the high-speed outflow of liquid in the impeller on the suction side strongly interferes with the flow field near the casing inner wall under the action of impeller rotation, the rotor–stator interaction has a greater influence on the pressure fluctuation of the pump casing inner wall on the suction side than that on the exhaust side. From the trailing edge of the suction port to the leading edge of the exhaust port in the pump, the periodicity and stability of the pressure fluctuation on the casing inner wall are worse than those in other regions because of the complex evolution of multi-scale vortex structure caused by the full development of turbulence. The casing inner wall near the leading edge of the suction zone and the trailing edge of the exhaust zone is prone to produce high-intensity separated flow, which shows a complex spatial–temporal variation law with the change of operating conditions.

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Abbreviations

η :

Liquid ring vacuum pump efficiency, %

p 1 :

Inlet vacuum of pump, kPa

P 1 :

Inlet absolute pressure of pump, Pa

t :

Time, s

P 2 :

Outlet absolute pressure of pump, Pa

f BPF :

Blade passing frequency (= nZ/60), Hz

Q :

Volume flow rate of pump, m3/h

Z :

Number of impeller blades

M :

Torque acting on the impeller, N·m

f :

Frequency of pressure fluctuation, Hz

n :

Rotational speed (= 60fd/pd), r/min

f n :

Shaft frequency (= n/60), Hz

f d :

Frequency of power supply, Hz

RMS :

The root mean square of the analysis frequency band, kPa

p d :

Number of pole-pairs of motor

A 1 :

Amplitude of initial frequency in the analysis frequency band, kPa

ω :

Angular velocity of the impeller(= 2πn/60), rad/s

A N :

Amplitude of final frequency in the analysis frequency band, kPa

Q f :

Feeding water flow rate, m3/h

A i :

The amplitude corresponding to a certain frequency, kPa

P :

Pump shaft power (= M·ω), kW

N :

The number of frequency in the analysis frequency band

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Funding

The work was supported by Industrial Support Plan for Colleges and Universities in Gansu Province of China (Grant Numbers 2021CYZC-14) and Natural Science Foundation in Gansu Province of China (Grant Numbers 21JR7RA220).

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Authors and Affiliations

  1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Guangqiang Guo & Renhui Zhang

  2. Key Laboratory of Fluid Machinery and Systems, Lanzhou, 730050, Gansu, China

    Guangqiang Guo & Renhui Zhang

Authors
  1. Guangqiang Guo
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  2. Renhui Zhang
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Correspondence to Renhui Zhang.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Technical Editor: Daniel Onofre de Almeida Cruz.

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Guo, G., Zhang, R. Experimental study on pressure fluctuation characteristics of gas–liquid flow in liquid ring vacuum pump. J Braz. Soc. Mech. Sci. Eng. 44, 261 (2022). https://doi.org/10.1007/s40430-022-03563-2

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