RU94011550A - Gas layer for displacement-type vessel - Google Patents

Abstract

FIELD: river and sea-going displacement-type vessels. SUBSTANCE: gas layer is formed by forcing the gas to trough-shaped guard of flat portion of bottom at smooth run-up of water on gas layer in bow and coming off in stern for shallow-draft vessels due to exhaust of internal combustion engine under bottom and due to bleeding part of air from supercharging compressor of internal combustion engine for medium-draft and deep-draft vessels. Consumption of power for creation and maintenance of gas layer is lesser than reduction of power of ship's main engines by at least 20 times. EFFECT: considerable reduction of wetted surface of ship's hull by approximately 50 percent for medium- and deep-draft vessels and still more for shallow-draft vessels.

Claims (1)

The invention relates to river and sea displacement ships. The essence of the invention is that the reduction of water friction on the wetted surface of the hull is achieved by a significant reduction in the wetted area of the hull due to the gas layer under the flat part of the bottom of the displacement vessel, which is at least half for medium and deep-seated vessels and even more for small-sitting vessels from the whole vessel surface below the waterline. The gas layer is created by injecting gas into the trough-like enclosure of the flat part of the bottom with a smooth run of water on the gas layer in the bow and its descent in the stern of the vessel for small-sitting vessels due to the exhaust of the internal combustion engine (ICE) under the bottom, for medium- and deep-sitting vessels, for due to the selection of part of the air from the engine’s pressurization compressor. The cost of power to create and maintain a gas layer is more than 200 times less than the reduction in the power of the main engines of the vessel due to the introduction of a gas layer.