Gas-liquid two-phase flow volume void fraction measuring method based on differential pressure signal fluctuation

The invention discloses a gas-liquid two-phase flow volume void fraction measuring method based on differential pressure signal fluctuation. The method comprises the following steps that 1) the differential pressure fluctuation signal of flowing through a Venturi tube of gas-liquid two-phase flow is acquired; 2) the relative variance, skewness, kurtosis and entropy of the differential pressure fluctuation signal are calculated; 3) the flow pattern is identified by applying a fuzzy pattern recognition method and the maximum membership principle; and 4) the volume void fraction is calculated based on the flow pattern recognition result according to the fluctuation coefficient of the differential pressure signal, wherein the fluctuation coefficient is determined according to the extremepointsymmetric mode decomposition result. The advantages of the method are that flow pattern identification of the gas-liquid two-phase flow and measurement of the volume void fraction can be realized by only using one Venturi tub