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The process of development of gas-liquid flow output from raw water intake is under consideration in the work. The main target of work was to free surface bump dimensions determine and the opportunity of bump dimensions influence on navigation safety obtain. The description process was based on towing tank tests results of two different prototype units and of it’s simplify model as well. The results recalculation on the real condition was done using Froude number, Reynolds number and Weber number. The speed feeding of compressed air was calculated taking into account the power consumption of device. The towing tank tests results show that the form of free surface bump on surface projection is approximate circle. The circle diameter is equal to raw water intake length. The gas-liquid flow divided into separate bubbles near output of device but before the filter surface. The bubbles come to the surface separately. No tendency to combine the small bubbles into large one was observed. The angle between the free surface bump slope and smooth free surface concur with angle of wave slope. So the bump could be dangerous for the small boat with poor seaworthiness. The sudden roll angle enlarge could be the reason of boat overturn.

vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s. o. makarova/vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s.o. makarova

INVESTIGATION OF EFFECTS ARISING IN THE PROCESS OF PNEUMATIC CLEANING OF THE RAW WATER INTAKE SCREENS