Study On Swirler Sampler Along The Circumference

Gas-liquid two-phase flow has its extensive existence in a variety of industries including petroleum, chemical, energy, etc. As more requirements have been presented in metering, energy saving, and control by industrial production, there has been an increasing demand of parameters measurement of two-phase flow. Metering and distributing of gas-liquid two-phase flow has been a problem due to complexity of two-phase flow. Swirler sampler along the circumference provides a new solution for the problem. Certain progress has been made for the technique. Theoretical method that is used to determine sampling hole size, position, structural design of swirler and rectifier was presented in the paper. Further study on swirler sampler along the circumference was made with combination of numerical simulation and experiment based upon self-design.Two dimension numerical simulation of pin-hole flow field in liquid-gas two phase flow that is around pipe wall was firstly performed in the paper with numerical simulation software Characteristic A sampling hole with a design inside diameter of 5mm is obtained. Flow filed of liquid-gas two phase flow under different bore diameter and effect of liquid-gas inlet flow rate variation on extraction ratio of distribution branch pipe with the same bore diameterRectifier and swirler are fabricated. Three sets of experimental device that is used to measure liquid membrane thickness of annular flow after flow rectification are arranged by means of leakage measurement method. Sampling hole with the optimized position for annular flow shall be located at where is 30 distance from the rectifier. Normal working range of swirler and rectifier are conversion speed of gas phase is higher than 30.50m/s, and liquid phase higher than 0.08m/s.sampling device for swirling flow distribution were designed, including swirler, rectifier, separator, metering device, etc. Size of sampling hole and effect of resistance force exerted by side branch pipe on liquid-gas extraction ratio of the swirling flow distribution device under variation of liquid-gas flow rate were studied in detail. Comparison was made between calculation value and measurement value of liquid-gas split factor. Under condition of the experiment, maximum relative error of liquid phase flow rate by means of ESM is 20.35%, while 20.94% for gas phase. Flow patters involved in experiment include stratified flow, wave flow, and slug flow.