# Influence of the Installation Position of Submersible Pumps on Deposition Characteristics in Prefabricated Pumping Stations

^{1}

^{2}

^{3}

^{*}

## Abstract

**:**

_{0}, however, at this time the inlet bias of the pump is larger, which is not conducive to the smooth operation of submersible pumps. The area ratio and deposition rate of the easy deposition region gradually increase with the increase in the interval of the pumps. As the center distance increases, the area ratio and deposition rate of the easy deposition region basically decreases first and then increases, and reach the minimum at 0.1R and 0R, respectively.

## 1. Introduction

## 2. Research Model and Method

#### 2.1. Research Model

_{0}= 1200 mm, inlet pipe diameter D = 100 mm, inlet pipe height H

_{0}= 820 mm, operation liquid level h

_{1}= 1200 mm, the design flow rate of single pump Q = 42 m

^{3}/h, head H = 10 m, and rotational speed n = 1480 r/min.

#### 2.2. Grid Generation

#### 2.3. Calculation Method for the Internal Flow Field

^{3}and a diameter of 6 mm enter from the inlet at the same initial velocity as the liquid phase water, and the volume fraction was 1%. It was assumed that the turbulence was fully developed at the outlet of the pipe, and the outlet was set as a free outlet boundary.

#### 2.4. Calculation Method for the Deposition Rate

_{t}is the number of incoming particles, and N

_{e}is the number of outgoing particles.

#### 2.5. Calculation Method for the Area Ratio of the Easy Deposition Region

- (1)
- Particles settling theory.

_{s}is the average diameter of particles, and its value is 6 mm, φ is the drag coefficient, d

_{s}= 6 mm, $\phi =\frac{\pi}{8}C$, C = 0.4~0.5, ρ

_{s}and ρ

_{l}are the density of particles and liquid, and their values are 1200 kg/m

^{3}and 1000 kg/m

^{3}, respectively.

- (2)
- Image processing technology.

- (3)
- Area identification of easy deposition region.

_{d}and the pump pit surface area A

_{a}were obtained, the formula for calculating the area ratio of the easy deposition region is as follows:

#### 2.6. Calculation Scheme

## 3. Results and Analysis

#### 3.1. Influence of Suspension Height on Deposition Performance

_{0}. The number of particles sucked into the two submersible pumps is basically the same at a low suspension height, whereas with an increase in the suspension height, the number of particles escaping from the pipeline is significantly different and the total number of particles passing through also decreases.

_{0}, the area ratio of the easy deposition region is 31.4%, and the deposition rate is 58.8%. When the suspension height is 0.2H

_{0}, the area ratio and deposition rate of the easy deposition region are 34.8% and 77.3%, respectively. When the suspension height is 0.3H

_{0}, the area ratio and deposition rate of the easy deposition region increase to 35.6% and 98.3%, respectively. It was found that the area ratio and deposition rate of the easy deposition region show an upward trend with an increase in the suspension height.

#### 3.2. Influence of Pump Interval on Deposition Performance

#### 3.3. Influence of Center Distance on Deposition Performance

## 4. Conclusions

- With the increase in suspension height, flow field distribution is affected, the number of particles escaping from the pipeline is obviously different, and the total number of particles passing through also decreases, whereas the area ratio and deposition rate of the easy deposition region increase. The sewage discharge effect is best when the suspension height is 0.1H
_{0}, but at this time the inlet bias of the pump is larger. So, when determining the suspension height of submersible pumps, it is necessary to balance the discharge effect and the inlet state. - With the increase in the interval of the pumps, the suction to the central region decreases, a large of particles escape from the pumps, and the number of absorbed particles gradually decreases, while the area ratio and deposition rate of the easy deposition region gradually increases.
- With the increase in center distance, the suction capacity of the pump is affected. The area ratio and deposition rate of the easy deposition region decreases first and then increases. The area ratio and deposition rate of the easy deposition region reach the minimum at 0.1R and 0R, respectively.

## Author Contributions

## Funding

## Conflicts of Interest

## References

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**Figure 2.**3D model of prefabricated pumping station [11].

**Figure 3.**Comparison of external characteristics curves in the submersible pump. (

**a**)Head characteristic curve; (

**b**) Efficiency characteristic curve.

**Figure 8.**Area ratio and deposition rate of the easy deposition region under different suspension heights.

**Figure 11.**Area ratio and deposition rate of the easy deposition region under different pump intervals.

**Figure 14.**Area ratio and deposition rate of easy deposition region under different center distances.

Suspension Height H_{1} | 0.1H_{0} | 0.15H_{0} | 0.2H_{0} | 0.25H_{0} | 0.3H_{0} |
---|---|---|---|---|---|

Pumps interval S | 0.8R | 0.9R | 1R | 1.1R | 1.2R |

Center distance L | −0.3R | −0.2R | −0.1R | 0R | 0.1R |

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## Share and Cite

**MDPI and ACS Style**

Wang, K.; Bao, H.; Liu, H.; Zhang, Z.; Hu, J.
Influence of the Installation Position of Submersible Pumps on Deposition Characteristics in Prefabricated Pumping Stations. *Symmetry* **2020**, *12*, 1347.
https://doi.org/10.3390/sym12081347

**AMA Style**

Wang K, Bao H, Liu H, Zhang Z, Hu J.
Influence of the Installation Position of Submersible Pumps on Deposition Characteristics in Prefabricated Pumping Stations. *Symmetry*. 2020; 12(8):1347.
https://doi.org/10.3390/sym12081347

**Chicago/Turabian Style**

Wang, Kai, Haifeng Bao, Houlin Liu, Zixu Zhang, and Jianbin Hu.
2020. "Influence of the Installation Position of Submersible Pumps on Deposition Characteristics in Prefabricated Pumping Stations" *Symmetry* 12, no. 8: 1347.
https://doi.org/10.3390/sym12081347