Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (5): 64-69, 76.doi: 10.6040/j.issn.1672-3961.0.2020.093

• Electrical Engineering • Previous Articles     Next Articles

Optimization of the inner deflector of the shrimp-waist elbow

Jinsheng QI1(),Hongzhen CAO1,Yan SHI2,Wenjing DU2,Zhan WANG2,*()   

  1. 1. Shandong Electric Power Engineering Consulting Institute Corporation, Jinan 250013, Shandong, China
    2. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2020-04-08 Online:2020-10-20 Published:2020-10-19
  • Contact: Zhan WANG E-mail:qijinsheng@sdepci.com;wangzhan@sdu.edu.cn

Abstract:

In order to study the distribution of the flow field and improve the uniformity of the flow field in a shrimp-waist bend, a series of three-dimensional numerical simulation studies on the turbulent secondary flow in a bend before and after the installation of the deflector was carried out by using the Realizable k-ε model. The results showed that when the deflector was not arranged in the shrimp-waist bend pipe, a large range of low-speed zones appeared in the horizontal straight pipe section after the fluid turns, and a backflow phenomenon occured at the same time. The airflow distribution was extremely uneven and the pressure resistance was large. After the deflector was arranged, the flow characteristics of the fluid in the elbow were effectively improved and the energy loss of the system was reduced. Based on the analysis of the influence of different number, structure and arrangement of deflectors on the uniformity of flow field and pressure drop loss of the bend, the optimal arrangement of deflectors in the shrimp-waist bend was proposed as follows: the number of deflectors was 3, the deflectors′ center angle was 60°, and the deflectors were all arranged backward.

Key words: elbow, flow field optimization, resistance loss, deflector, numerical simulation

CLC Number: 

  • TB126

Fig.1

Geometry model of elbow"

Fig.2

Validation of solver and turbulence model"

Fig.3

Independence analysis of grid number"

Fig.4

Pressure distribution in the central section of bend"

Fig.5

Velocity distribution and streamline diagram in the center section of bend"

Fig.6

Cv of different number of deflector models at the reference section"

Fig.7

Total resistance loss for different number of deflector models"

Fig.8

Pressure distribution of the elbow after the deflectors arranged"

Fig.9

Velocity distribution and streamline diagram of the elbow after the deflectors arranged"

Fig.10

Variation of flow field uniformity with θ"

Fig.11

Variation of total resistance loss with θ"

Fig.12

Cv at different starting and ending positions"

Fig.13

Velocity distribution and streamline diagram of different models of start and stop position of deflectors(θ=60°)"

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