WO-2026091419-A1 - GAS DRAG REDUCTION JET APPARATUS AND SHIP

WO2026091419A1WO 2026091419 A1WO2026091419 A1WO 2026091419A1WO-2026091419-A1

Abstract

A gas drag reduction jet apparatus for a ship, said apparatus comprising a gas supply assembly, flow guide ducts (1), and flow guide covers (2). One end of each flow guide duct (1) is connected to the gas supply assembly, and the other end of each flow guide duct (1) is configured to be in communication with a through hole (1001) on a ship bottom plate (1000). The flow guide covers (2) are each configured to cover a through hole (1001) from the side of the ship bottom plate (1000) away from the flow guide ducts (1), so that each flow guide cover (2) and the ship bottom plate (1000) form a narrow slit. The slit is used for ejecting a gas and allowing the gas to flow along the ship bottom plate. The gas drag reduction jet apparatus occupies a small area of the ship bottom plate, is easy to arrange, and can reduce the adverse effect of the gas drag reduction jet apparatus itself on the performance and structure of a ship body.

Inventors

WANG, XIAOLONG
DAI, KUN
LIN, YUAN
MIAO, Aiqin
XIE, Qianhui
LIN, BOXING
WANG, Qinchun
CAI, Qianya
FAN, TAO
ZHOU, Qinghua
ZHENG, Shuangyan
YU, Chenfang
YU, YANG
JIANG, Xiongjian
YUAN, JING

Assignees

江南造船(集团)有限责任公司

Dates

Publication Date: 20260507
Application Date: 20250419
Priority Date: 20241031

Claims (15)

A gas drag reduction jetting device, characterized in that it comprises: Gas supply components; A flow guide pipe, one end of which is connected to the air supply assembly, and the other end of which is configured to communicate with a through hole on the bottom plate of the ship; A flow guide cover is configured to cover the through hole from the side of the bottom plate away from the flow guide tube, so that the flow guide cover and the bottom plate form a narrow slit for gas to be ejected and for the gas to flow along the bottom plate.
The gas drag reduction jet device according to claim 1 is characterized in that: there are multiple guide pipes, each of which is connected to the gas supply component; there are multiple guide covers, each of which corresponds to one of the multiple guide pipes.
According to claim 2, the gas drag reduction jet device is characterized in that: a plurality of the guide pipes are arranged at intervals around the gas supply component and there is a preset angle between two adjacent guide pipes.
According to claim 1, the gas drag reduction jet device is characterized in that: the cross-sectional area of the guide tube in the vertical direction gradually increases from one end near the gas supply component to one end of the guide cover.
The gas drag reduction jet device according to claim 4 is characterized in that: the guide tube is in the shape of a triangular truncated pyramid.
According to claim 1, the gas drag reduction jet device is characterized in that: the guide pipe is configured to form a preset angle with the bottom plate of the ship.
According to claim 1, the gas drag reduction jet device is characterized in that: the side of the guide cover opposite to the guide tube is a quarter-ellipsoid.
According to claim 1, the gas drag reduction jet device is characterized in that: the flow guide cover has a groove on the side facing the flow guide tube, and the groove is used to form the narrow slit when the flow guide cover is placed over the through hole.
According to claim 1, the gas drag reduction jet device is characterized in that: the gas supply assembly includes an air inlet pipe, an air chamber and a bubble generator, the air chamber is provided with an air inlet hole, an air outlet hole and an internal air chamber communicating with the air inlet hole and the air outlet hole, the bubble generator is disposed in the air chamber and separates the air inlet hole and the air outlet hole, the air inlet pipe is connected to the air inlet hole, and the number of guide pipes and the number of air outlet holes are equal and they are connected in a one-to-one correspondence.
According to claim 9, the gas drag reduction jet device is characterized in that: the size of the air outlet is inversely proportional to the number of air outlets.
According to claim 9, the gas drag reduction jet device is characterized in that: the bubble generator includes an inner tube and an outer tube, the inner tube is located inside the outer tube and the two are spaced apart, the inner tube and the outer tube divide the air chamber into multiple regions, the air inlet is located in the region between the inner tube and the air chamber, the air outlet is located in the region between the outer tube and the air chamber, and multiple arrayed through holes are provided on both the inner tube and the outer tube.
According to claim 9, the gas drag reduction jet device is characterized in that: the gas supply assembly further includes a base, the base being configured to be disposed on a flat plate at the bottom of the ship, and the gas chamber being disposed above the base.
According to claim 12, the gas drag reduction jet device is characterized in that: the base is a cross-shaped trapezoid, the maximum length of the top of the base is equal to the maximum dimension of the outer contour of the air chamber, and the maximum length of the bottom of the base is greater than the maximum length of the top.
A ship, characterized in that it includes a bottom plate and a gas drag reduction jetting device as described in any one of claims 1-13 disposed on the bottom plate.
A jet adjustment method for a gas drag reduction jet device as described in any one of claims 1-13, characterized in that: based on the ship's hull type, the adjustment is made by at least one of four methods: changing the number of guide pipes, the angle between two adjacent guide pipes among the multiple guide pipes, the angle between the guide pipe and the bottom plate of the ship, and the angle between the two sides of the guide pipe.

Description

Gas drag reduction jet devices and ships Technical Field This invention relates to the field of marine energy conservation, and in particular to a gas drag reduction jet device and a ship. Background Technology Gas-lubricated ships refer to vessels equipped with gas-lubricating technology. Gas lubrication technology involves injecting gas between the hull and seawater to form an air layer, thereby reducing frictional resistance between the hull and the water, thus improving ship operating efficiency and reducing fuel consumption. The gas-lubricating jet unit, as the core component of this technology, has a significant impact on its final drag reduction and energy-saving effects through its structure and arrangement. Although different technical approaches to gas lubrication technology have been disclosed, there is still room for optimization regarding the adverse effects of installing gas drag reduction jet devices on hull performance and structure. Summary of the Invention In view of the shortcomings of the above-mentioned related technologies, the purpose of the present invention is to provide a gas drag reduction jet device and a ship, so as to reduce the adverse effects of the gas drag reduction jet device itself on the ship's performance and structure. To achieve the above and other related objectives, the present invention provides a gas drag reduction jetting device, comprising a gas supply assembly; a guide pipe, one end of which is connected to the gas supply assembly, and the other end of which is configured to communicate with a through hole on a bottom plate; and a guide cover, which is configured to cover the through hole from the side of the bottom plate away from the guide pipe, such that the guide cover and the bottom plate form a narrow slit, the narrow slit being used for gas to be ejected and for the gas to flow along the bottom plate. Optionally, there are multiple flow guides, each of which is connected to the gas supply assembly, and multiple flow guide covers, each corresponding to one of the multiple flow guides. Optionally, a plurality of the guide pipes are arranged at intervals around the air supply assembly and there is a preset angle between two adjacent guide pipes. Optionally, the cross-sectional area of the flow guide tube in the vertical direction gradually increases from one end near the air supply assembly to one end of the flow guide cover. Optionally, the guide tube is in the shape of a truncated triangular prism. Optionally, the guide tube is configured to form a preset angle with the bottom plate of the ship. Optionally, the side of the flow guide cover opposite to the flow guide tube is a quarter-ellipsoid. Optionally, the flow guide cap has a groove on the side facing the flow guide tube, the groove being used to form the narrow slit when the flow guide cap is placed over the through hole. Optionally, the gas supply assembly includes an air inlet pipe, an air chamber, and a bubble generator. The air chamber has an air inlet, an air outlet, and an internal air chamber that communicates with the air inlet and the air outlet. The bubble generator is located in the air chamber and is separated from the air inlet and the air outlet. The air inlet pipe communicates with the air inlet, and the number of guide pipes is equal to the number of air outlets and they are connected in a one-to-one correspondence. Optionally, the size of the air outlet is inversely proportional to the number of air outlets. Optionally, the bubble generator includes an inner tube and an outer tube, the inner tube being located inside the outer tube and the two being spaced apart, the inner tube and the outer tube dividing the air chamber into multiple regions, the air inlet being located in the region between the inner tube and the air chamber, the air outlet being located in the region between the outer tube and the air chamber, and multiple arrayed through holes being provided on both the inner tube and the outer tube. Optionally, the air supply assembly further includes a base configured to be mounted on a flat plate at the bottom of the ship, with the air chamber located above the base. Optionally, the base is a cross-shaped trapezoid, the maximum length of the top of the base is equal to the maximum dimension of the outer contour of the air chamber, and the maximum length of the bottom of the base is greater than the maximum length of the top. A vessel includes a bottom plate and a gas drag reduction jet device as described above disposed on the bottom plate. A jet adjustment method for the gas drag reduction jet device as described above, based on the ship's hull type, is adjusted by at least one of four methods: changing the number of guide tubes, the angle between two adjacent guide tubes, the angle between the guide tube and the bottom plate, and the angle between the two sides of the guide tube. As described above, the gas drag reduction jetting device and ship of the present invention hav