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Research Papers: Flows in Complex Systems

A Study on Aeration to Alleviate Cavitation Erosion in the Contraction Section of Pressure Flow

[+] Author and Article Information
Rui Li

State Key Laboratory of Hydraulics and
Mountain River Engineering,
Sichuan University,
Chengdu 610065, China
e-mail: li.rui.sai@gmail.com

Wei-Lin Xu

State Key Laboratory of Hydraulics and
Mountain River Engineering,
Sichuan University,
Chengdu 610065, China
e-mail: xuwl@scu.edu.cn

Jing Luo

State Key Laboratory of Hydraulics and
Mountain River Engineering,
Sichuan University,
Chengdu 610065, China
e-mail: luojing@scu.edu.cn

Hao Yuan

State Key Laboratory of Hydraulics and
Mountain River Engineering,
Sichuan University,
Chengdu 610065, China
e-mail: 18996152721@163.com

Wei-Yang Zhao

State Key Laboratory of Hydraulics and
Mountain River Engineering,
Sichuan University,
Chengdu 610065, China
e-mail: wyzhao_sl@163.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 9, 2018; final manuscript received January 24, 2019; published online April 9, 2019. Assoc. Editor: Matevz Dular.

J. Fluids Eng 141(9), 091108 (Apr 09, 2019) (10 pages) Paper No: FE-18-1465; doi: 10.1115/1.4043230 History: Received July 09, 2018; Revised January 24, 2019

Pressure flow generally exists in water conservancy projects and pipelines. The flow boundary of the contraction section faces a potential risk of cavitation erosion under high velocity. However, there is a lack of effective methods to suppress cavitation in engineering practices with pressure flow, posing a challenge to the operational safety of discharge structures and pipeline devices. The purpose of this paper was to realize the application of air entrainment in a plug-type contraction section of pressure flow. It was found that a single air vent and a low air flow rate could achieve complete vena contracta aeration. The pressure profiles of the vena contracta were investigated, and the results showed that the pressure distribution allowed the entrained air to diffuse laterally and convectively. Finally, we proposed a fitting algorithm to predict the air concentration in the vena contracta. These conclusions are of great significance for improving the safety and cavitation resistance of the contraction section of pressure flow.

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References

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Figures

Grahic Jump Location
Fig. 1

Scheme of the experimental setup and measurement arrangements and coordinates

Grahic Jump Location
Fig. 2

Sketch of a plug-type energy dissipator

Grahic Jump Location
Fig. 3

Distribution of the air concentration under a velocity of 1.19 m/s ((a)(h)) pertains to Qa = (0.33, 0.67, 1.00, 1.33, 1.67, 2.00, 2.33, and 2.67) × 10−4 m3 s−1, respectively)

Grahic Jump Location
Fig. 4

Lateral variation in the wall air concentration under different air flow rates ((a)–(f) pertains to x/a = 0.08, 0.2, 0.4, 0.6, 0.8, and 1, respectively)

Grahic Jump Location
Fig. 5

Flow direction variation in the wall air concentration under different air flow rates ((a)–(e)) pertains to y/b1/2 = 0, 0.24, 0.48, 0.68, and 0.92, respectively)

Grahic Jump Location
Fig. 6

Variation in the time-averaged pressure under different air flow rates ((a)–(f)) pertains to x/a = 0.08, 0.2, 0.4, 0.6, 0.8, and 1, respectively)

Grahic Jump Location
Fig. 7

Comparison between the fitted values and experimental values of the lateral variation in the wall air concentration ((a)–(f)) pertains to x/a = 0.08, 0.2, 0.4, 0.6, 0.8, and 1, respectively)

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