Study On Flow Field Characteristics Of Rotating Gas Liquid Mixer With Air Bearing Support

Gas liquid two phase flow as a fluid medium in a rotary gas-liquid mixer,which flow process has strong uncertainty.According to the structure,working principle and working environment of rotary gas-liquid mixer,and based on the the theory of fluid mechanics and the theory of multiphase flow,this paper uses the numerical simulation to study the flow field characteristics of rotary gas-liquid mixer under different working conditions.The main completed work of this paper are as followed:1)According to the characteristics of rotary gas liquid mixer under no-load static condition,0.1m·s-1.0.5m·s-s,1.0m·s-1average velocity was selected to study the effect of the average velocity of gas-liquid two-phase flow on the flow field.The results show that with the increase of flow velocity,the laminar flow state was translate into wavy flow,and greater speed,more obvious wavy flow,the stratified region distance the entrance side farther away.According to the characteristics of rotary gas liquid mixer under no-load rotation condition,Or·min-1,600r·min-1,1800r·min-1,3000r·min-1 rotation rate was selected to study the effect of centrifugal force on the flow field characteristics.The results show that as the speed increases,the flow state gradually appeared as eccentric axial flow,and the disappearance of the two phase mixed state is close to the entrance side,the flow effect is stronger.2)According to the characteristics of rotary gas liquid mixer under load static condition,with the block effect of cylinder body,0.1m·s-1,0.5m·s-1,10m·s-1 average velocity was selected to study the effect of average velocity on the flow field characteristics under block effect of cylinder body.The results show that with the increase of flow velocity,the gas-liquid two-phase flow pattern appears wavy flow,and flow through the cylindrical body,basin space decreases,bunchy jet and streaming flow appears.According to the characteristics of rotary gas liquid mixer under load rotation condition,Or·min-1,600r·min-1,1800·min-1,3000r·min-1rotation rate was selected to study the effect of centrifugal force on the flow field characteristics under block effect of cylinder body.The results show that as the speed increases,the flow pattern of axial flow appears.And block effect of cylinder body causes the vortex phenomenon,the spiral flow effect is enhanced.3)According to the flow state of gas-liquid two-phase flow under different conditions,by changing the mixing ratio of gas-liquid two-phase flow,analyzes the flow field effect and the pressure spectrum distribution.The results show that liquid proportion is an important factor which affects the force effect of the flow field,and the maximum stress area of the mixer appears in the bottom position of ±60°.In summary,the characteristics of gas-liquid two-phase flow field under different working conditions of the rotary type mixer was studied and the numerical calculation results was analyzed.The results show that the numerical calculation method can predict the transient flow pattern of gas-liquid two-phase flow,flow field effect and pressure spectrum.It provides a reference for the design and improvement of the radial air floating support of the rotary gas-liquid mixer,which is of great theoretical significance for further revealing the mechanism of the flow field in the rotary gas-liquid mixer.