关键词: 截面含气率 , 气液两相流 , 电容探针 , 流型

Abstract: Using a swirl element mounted upstream of the test section，the asymmetry flow patterns such as stratified flow，annular flow were transformed into annular flow with uniform film thickness．Then a single electrical capacitance probe was
applied to measure the film thickness to obtain the mean void fraction．Extensive experiments were carried out in an air－water two phase flow loop．The results show that the capacitance probe output is the function of liquid film thickness and independent of liquid property and temperature．During the wide experimental range the void fraction measured by the single capacitance probe agreed well with that obtained by quick closing valve method．Since the flow pattern is transformed to symmetry type， the gas and liquid distribution along the probe wire can represent the whole section， the shortcoming of traditional probe
measurement method and tomography method is escaped．

Key words: Void fraction , Gas－liquid two phase flow , Capacitance probe , Flow regime