Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (5): 122-130.doi: 10.6040/j.issn.1672-3961.0.2021.177

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Analysis of the influence of the underside baffle and deflector of the fume hood on the flow field

Ruiyi YAN1,2(),Zhen DONG2,Sen LU2,Yanhua LAI1,2,*(),Mingxin LÜ1,2   

  1. 1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
    2. Suzhou Institute, Shandong University, Suzhou 215123, Jiangsu, China
  • Received:2021-04-19 Online:2021-10-20 Published:2021-09-29
  • Contact: Yanhua LAI E-mail:yanruiyi@mail.sdu.edu.cn;laiyh@sdu.edu.cn

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Abstract:

For the phenomenon of vortex and gas escape in the flow field of the extant fume hood, the computational fluid dynamics method was used for simulation. This research changed the shape parameters of the underside structure of the fume hood window, used circular arc baffles with different radii, elliptical arc baffles with different lengths, and added deflectors with different radii. Then this research studied the influence of structural changes on the flow field in the fume hood by analyzing the size and location of the vortex to obtain the direction of structural optimization. The results showed that when the height of the underside baffle was low and the length was short, there was obvious large vortex in the center position of the fume hood and near the wall. A baffle with a height greater than 50 mm and a length greater than 90 mm could significantly reduce the vortex at the center of the fume hood and at the junction of the baffle and the side wall. Adding a deflector could optimize the flow field and make the center vortex disappear, and the radius of the deflector should not be greater than 70 mm, otherwise obvious vortices would be excited on the outside and end of the baffle, which provides a basis for the rational design of fume hoods.

Key words: fume hood, flow field, vortex, baffle, structure optimization

CLC Number: 

  • TU834.4

Fig.1

The basic structure of the fume hood"

Fig.2

Geometric model of fume hood"

Fig.3

Schematic diagram of meshing"

Table 1

The shape change of baffle and deflector mm"

类型 圆弧挡板半径变化 椭圆弧挡板长度变化 导流板半径变化
1 20 30 50
2 30 60 70
3 40 90 90
4 50 120 110
5 60 150 130

Fig.4

Schematic diagram of the analyzed planes"

Fig.5

Schematic diagram of the vortex formed by the fume hood"

Fig.6

Vortex near the arc baffle"

Fig.7

Comparison of vortex heights of baffles designed with circular arc"

Fig.8

Vortex near the elliptical arc baffle"

Fig.9

Comparison of vortex heights of baffles designed with elliptical arc"

Fig.10

Vortex near the deflector"

Fig.11

Comparison of vortex heights of deflectors with different radii"

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