溢流染色机圆喷嘴流场建模与涡流场仿真分析

针对喷嘴内部气液两相流流动特性对织物染色产生的影响,建立计算流体动力学数学模型,对喷嘴内部液相的流动特性及液相流动对气相产生的影响进行三维模拟仿真,并根据仿真结果分析喷嘴盖内气体动静态压力的变化及喷嘴内染液的速度场和压力场的分布.研究结果表明:液相的快速运动引起喷嘴盖内气相的动态脉动,喷嘴盖内压力为负值,喷孔处液相的速...

Flow field modeling and eddy current field simulation research of overflow dyeing machine round nozzle

In order to study the effect of the gas-liquid two-phase flow characteristics on fabric dyeing inside the nozzle, a computational fluid dynamics mathematical model has been developed to simulate liquid flow characteristics and liquid flow effect on gas on 3-D basis, then according to the simulated results, dynamic and static pressure changes and the velocity and pressure field distribution were analyzed in the nozzle. Study results showed that the rapid movement of liquid phase causes the dynamic pulse of gas, which make subatmospheric pressure generate in the nozzle. The speed of liquid becomes larger and the pressure change more greatly, the tortuous flow phenomenon is marked in the nozzle pipe. According to the related thermodynamics theory and simulation analysis results, the gas sources and power sources of the "tambour" phenomenon and the fabric tangle phenomenon often occurred in the actual production process are ascertained, and then improvement blue print of the nozzle is presented.