Content area
An in-depth analysis of the two-phase flow in a hydraulic braking pipeline can reveal its evolution process pertinent for designing and maintaining the hydraulic system. In this study, a high-speed camera examined the two-phase flow pattern and bubble characteristics in a hydraulic braking pipeline. Bubble flow pattern recognition, bubble segmentation, and bubble tracking were performed to analyze the bubble movement, including its behavior, distribution, velocity, and acceleration. The results indicate that the gas–liquid two-phase flow patterns in the hydraulic braking pipeline include bubbly, slug, plug, annular, and transient flows. Experiments reveal that bubbly flow is the most frequent, followed by slug, plug, and transient flows. However, plug and transient flows are unstable, while annular flow occurs at a wheel speed of 200 r/min. Bubbles predominantly appear in the upper section of the pipeline. Furthermore, large bubbles travel faster than small bubbles, whereas slug flow bubbles exhibit higher velocities than those in plug or transient flows.
Details
Braking;
Annular flow;
Two phase flow;
Hydraulic equipment;
Heat;
Bubbles;
Visualization;
Pattern recognition;
Plugs;
Unsteady flow;
Flow pattern;
Velocity;
Cavitation;
Cameras;
Research methodology;
Viscosity;
Braking systems;
High speed cameras;
Sensors;
Power supply;
Algorithms;
Slug flow;
Multiphase flow;
Hydraulics
1 College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou 310018, China
2 School of New Energy and Intelligent Networked Automobile, University of Sanya, Sanya 572022, China