螺旋片导流式气液分离器的数值模拟与试验研究

The gas/liquid spiral separator, a key component in the compressed air system, was used to remove liquid and oil from gas stream by centrifugal and gravitational forces. To optimize the design of the separator,the relationship between the performance and structural parameters of separators is studied. Computational fluid dynamics (CFD) method is employed to simulate the flow fields and calculate the pressure drop and separation efficiency of air-liquid spiral separators with different structural parameters. The RSM (Reynolds stress model)turbulence model is used to analyze the highly swirling flow fields while the stochastic trajectory model is used to simulate the traces of liquid droplets in the flow field. A simplified calculation formula of pressure drop in spiral structures is obtained by modifying Darcy's equation and verified by experiment.

螺旋片导流式分离器压力简化计算

应用计算流体力学CFD(ComputationalFluidDynamics)方法,对湍流状态下不同结构参数的螺旋片导流式气液分离器螺旋结构中的流体流动场进行了数值模拟。通过分析比较螺旋个数和螺距分别对压力降的影响,从而修正达西公式,拟合出螺旋结构压力降的简化计算公式,并通过了试验验证。结果表明,用此简化计算公式计算的结果与试验数据基本一致,可以用于螺旋片导流式气液分离器螺旋结构设计计算。

旋流板和螺旋导叶气液分离性能对比研究

通过建立轴流导叶式气液分离器试验系统,采用试验的方法,在相同气液操作工况下对比研究了旋流板和螺旋导叶式气液分离器的压降和分离效率。试验研究结果表明,在550~1220 m^(3)/h的处理气量范围内,旋流板气相压降比螺旋导叶气相压降低13%~35%,能耗相对更低;在不同处理气量和液滴质量浓度下,旋流板分离效率比螺旋导叶分离效率高2%~10%,操作弹性也更大。在试验条件范围内,随着液滴质量浓度的增大,2种导叶最大分离效率对应的处理气量呈现先减小后增大的变化趋势;随着处理气量的增大,旋流板最大分离效率对应的液滴质量浓度呈现先增大后减小的变化趋势,而螺旋导叶最大分离效率对应的液滴质量浓度则呈现先增大后稳定的变化趋势。