Simulation of Gas-Liquid Two-phase Flow in Disc Pump under Different Inflow Bubble Diameters
In order to study the internal flow pattern transformation and the change law of bubble diameter in the gas-liquid two-phase flow disc pump,the visualization research and numerical simulation are used for analysis in this paper.The results show that when the inlet gas volume fraction increases from 1.12％to 27.67％,the flow pattern in the suction chamber changes from bubble flow to agglomerated bubble flow,slug flow and segregated flow.The bubble diameter at low gas content is small,and the gas-liquid mixing in the suction chamber is uniform and the flow is smooth.With the increase of gas content,the bubble diameter increases gradually,and the separation degree of gas-liquid two-phase in the suction chamber increases.Due to the particularity of the impeller structure of the disc pump,the blades in the leaf area of the front and rear cover plates play a barrier role.The gas phase gathers most violently at the edge of the blade in the leaf area,while the flow channel in the middle leafless area is wider and has higher permeability.Under the condition of 1 500 r/min and inlet gas volume fraction 7.11％,the local void fraction extreme value of the front edge of the blade in the blade area of the front cover plate increases to 3 times of the initial void fraction,the local void fraction extreme value of the blade edge in the blade area of the rear cover plate increases to 2 times of the initial void fraction,and the void fraction extreme value of the middle section of the bladeless area decreases to 2/3 of the initial void fraction.This study can provide a reference for analyzing the gas phase distribution and migration law in the disc pump impeller.
万方数据
维普
