旋流型管壁取样分配器分流特性

试制一种特殊的T型三通管结构取样器,8个取样孔均匀布置在管壁周围,取样孔上游布置有旋流叶片用于流型调整。研究气液两相流通过该分配器的流动特性。采用Euler气液两相流模型和雷诺应力模型,通过数值模拟方法分析节流元件尺寸对分配器分流特性的影响,并在多相流试验环道上开展试验研究。结果表明:旋流取样分配器特性受节流元件尺寸影响显著,前后压力场的变化是分流系数发生变化的根本原因。

Extracting characteristics of swirled sampling distributor on pipe walls

A specially designed T-junction type distributor was proposed. The swirled sampling distributor has 8sampling holes along the circumference of the pipe wall and a swirl element was mounted upstream for flow pattern adjustment. Euler multiphase flow model and Reynolds stress model were constructed to simulate the flow characteristics when gas-liquid two-phase flow passing the distributor. The effects of throttle sizes of the swirled sampling distributer on the extracting characteristics were numerically simulated. The experimental tests were carried out at air-water two phase flow loop to study splitting characteristics of the distributor. The results show that the effects of throttling element on the characteristics of cyclone samplers are significant. The change of pressure field is the most fundamental reason of the change of split coefficient.