Extracting characteristics of pipe wall sampling hole in swirled distributor

Key words:  gasliquid twophase flow  flow rate measurement  extracting and separating method  extracting characteristics  sampling hole  extraction ratio  numerical simulation

Abstract:

Based on the gasliquid twophase flow numerical simulation and experimental study on the flow rate measurement for sampling hole, extracting characteristics of sampling hole were investiga ted. The influence of sampling holes number, location in the axial direction,size,shape, and opening location on the circumference, on the stability and uniformity of sampling and the liquid phase extraction ratio was analyzed. The results show that the liquid phase extraction ratio bears little relation to main gas reduced velocity. The sample is of uniformity and stability when the liquid phase extraction ratio of the primary pipeline is more than 0.08 m/s and eight sampling holes with the diameter of 5 mm as well as the holes located 50 mm away from the rectifier outlet. Under these circumstances, the simulated liquid phase extraction ratio is about 0.064, which is very close to the experimental results of 0.08.