Ascertain the Relation between Underwater Bubbles' Parameters and Valve's Outlet Pressure with the Application of a High-Speed Camera

摘要

To fix the strict relation between the valve pressure and bubble film's parameter the high-speed camera is used in this paper to record the situation of underwater air bubble films in the flume. Then the single picture is intercepted from the record to calculating the size distribution and numeric density of bubbles through partitioning the picture into some special districts combined with element analysis. Moreover the moving speed of bubbles could be also fixed by drawing the track of bubbles when several consecutive intercepted pictures were compared together. These results can provide some reference of the target character for laboratorial underwater laser detection of wake bubbles.