Method and device for measuring void ratio of oil-gas two-phase flow of oil return pipeline of aero-engine

The invention discloses a method for measuring the void ratio of oil-gas two-phase flow in an oil return pipeline with temperature compensation, and the method comprises the steps: firstly simulating the typical flow pattern of the oil-gas two-phase flow in the oil return pipeline in an offline state, respectively measuring the capacitance signals between every two nonadjacent electrodes of an ECT sensor at room temperature under different void ratios, and forming an offline data set; measuring capacitance signals between every two nonadjacent electrodes when the ECT sensor is in a full tube state and an empty tube state at different temperatures, then carrying out normalization processing on the measured capacitance signals in the off-line data set, and training a void ratio measurement model based on principal component regression; during online testing, collecting the temperature of the section of the pipeline and capacitance signals between every two nonadjacent electrodes of the ECT sensor in real time,