Study on Flow⁃Field Characteristics of Rotor System in Internal Mixer

doi:10.19491/j.issn.1001-9278.2020.04.011

Abstract

Abstract:

A transient calculation method is used to simulate the rotor of a 4WS?tpye internal mixer. The maximum velocity of flow field was found to distribute on the top of the rotor ridge, where the reflux was prone to take place. The fluid velocity in the rotor clearance increased gradually and then tended to be stable with the running time of rotor until. There is a great influence on the fluid center area but a small impact on the near?wall area from the change of the rotating direction of the rotor. With the rotation of the rotor, the pressure difference between the propulsion area and backpressure zone decreased gradually, and the reflux phenomenon decreased accordingly.

Key words: internal mixer, flow field, velocity nephogram, pressure nephogram

CLC Number:

TQ 320.5

Bohong HAN, Yandong HE, Xiangzhe ZHU. Study on Flow⁃Field Characteristics of Rotor System in Internal Mixer[J]. China Plastics, 2020, 34(4): 60-69.

Figures/Tables 15

参数	数值
密度（ρ）/kg·m^-3	7 800
弹性模量（E）/GPa	210
剪切模量（T）/GPa	80.8
泊松比（μ₀）	0.3
拉伸强度（σ）/MPa	980
屈服强度（σ₁）/MPa	835
最大许用应力（[σ_b]）/MPa	557

Tab.1. Rotor material parameters

Fig.1. Rotor geometric model

几何参数	数值
棱顶宽度/mm	2
棱顶间隙/mm	1
转子根直径/mm	25
转子最大回转直径/mm	42
长棱螺旋角/°	30
短棱螺旋角/°	45
长棱长度/mm	50
短棱长度/mm	30
棱长/mm	76
转子中心距/mm	45

Tab.2. Parameters of the model

Fig.2. Flow field diagram

Fig.3. Grid model

Fig.4. Schematic diagram of the rotor section

Fig.5. Velocity nephogram of different sections at different moments (the same direction rotor)

Fig.6. Velocity nephogram of different sections at different moments (the opposite direction rotor)

Fig.7. Vector diagram of Z2 section at 0.52 s (the same direction rotor)

Fig.8. Vector diagram of Z2 section at 0.52 s (the opposite direction rotor)

Fig.9. Value position of flow field data

Fig.10. Velocity curves of different regions

Fig.11. Pressure nephogram of different sections at different moments (the same direction rotor)

Fig.12. Pressure nephogram of different sections at different moments (the opposite direction rotor)

Fig.13. Pressure curves of different regions

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