Investigation of the kinematics behavior of spherical detector with different diameter ratios in oil pipelines

The spherical detector is an important technical equipment for water supply pipeline leakage detection. Its stable operation inside the pipeline will be affected by the fluid state in the pipeline, and the motion law of detectors with different diameters is different. In this paper, the dynamic analysis is carried out using the numerical simulation method, and the motion of spherical detectors with different diameters in horizontal oil pipelines is simulated. It is found that the flow state of the detector changes from the acceleration stage to the stable stage during the motion process, and with the decrease of the diameter ratio, the pressure difference between the front and back of the detector gradually increases, the thrust shows an upward trend, and the speed shows a greater speed in the stable stage. The motion behavior of the detector under different pipe diameter ratios is obtained, which provides help for the subsequent optimization of the shape design of the micro-leakage internal spherical detector.