A jet-propelled water-entry composite buffer device for multi-channel gas recycling includes a head fairing, an underwater vehicle, a buffer, a cavitator and a side fairing. The side fairing is internally provided with a fairing body and a sealing choke plate, and a high-pressure gas cavity, a transition cavity and a sub-high-pressure gas cavity are formed by the fairing body and the sealing choke plate from front to back; a quota air pressure valve is disposed on the sealing choke plate; the fairing body is provided with pressure reducing holes; the high-pressure gas cavity, the transition cavity and the sub-high-pressure gas cavity form an gas cushion buffer. Gas acceleration holes communicated with the high-pressure gas cavity are further provided in the outer wall of the side fairing, so that a supercavity can be more favorably formed after the underwater vehicle enters water.

A cavitator system for suppressing a cavity buoyancy effect and a control method thereof are provided. The cavitator system for suppressing a cavity buoyancy effect includes a cavity generating unit disposed at a front portion of an underwater vehicle and generating super-cavity, a pneumatic hose transferring compressed air stored in a compressed air tank to the underwater vehicle, a ventilation module positioned at a tail portion of the underwater vehicle and including at least one hole ventilating compressed air transferred through the pneumatic hose vertically downwards, and a controller sensing rise of a cavity tail portion and a change in posture of the underwater vehicle when a super-cavity is generated and ventilating compressed air through the ventilation module such that a vertically downward lift is generated at the cavity tail portion.

A cavitator system for suppressing a cavity buoyancy effect and a control method thereof are provided. The cavitator system for suppressing a cavity buoyancy effect includes a cavity generating unit disposed at a front portion of an underwater vehicle and generating super-cavity, a pneumatic hose transferring compressed air stored in a compressed air tank to the underwater vehicle, a ventilation module positioned at a tail portion of the underwater vehicle and including at least one hole ventilating compressed air transferred through the pneumatic hose vertically downwards, and a controller sensing rise of a cavity tail portion and a change in posture of the underwater vehicle when a super-cavity is generated and ventilating compressed air through the ventilation module such that a vertically downward lift is generated at the cavity tail portion.

An adjustable cavitator structure has a cavitator disposed at a head end of the underwater vehicle. The cavitator has a cavitator body, a center of which is connected to the head center of the underwater vehicle through a damper. The front end of the cavitator body is detachably connected with a head fairing device. The cavitator body is of a double-layer structure including a first layer and a second layer. A plurality of cavitator disc face retractable sheets are installed on the first layer and the second layer and are evenly distributed around the axis of the cavitator body, and are slidably connected with the corresponding first layer or second layer. A buffer driving mechanism for driving the cavitator disc face retractable sheets to slide in a radial direction of the cavitator body is installed at the head end of the underwater vehicle.

A combined disc-type cavitation structure for underwater navigation of an underwater vehicle has an underwater vehicle and a fairing. A plurality of cavitators having sequentially increased outer diameters are sequentially arranged in the fairing. A cavitator receiving groove matched with the cavitator located on the front side is arranged in the center of the front surface of the cavitator located on the rear side in every two adjacent cavitators. The plurality of cavitators can be integrated into a whole by means of the cavitator receiving groove. The cavitator located at the front-most end is a first cavitator, and the remaining cavitators are second cavitators. The first cavitator is connected to the underwater vehicle by means of a buffer. Each second cavitator is respectively connected to the underwater vehicle by means of a driving device configured to axially move the corresponding second cavitator.

A vessel configured for transporting cargo can be configured to operate in a supercavitation mode, the supercavitation mode including releasing a fluid at least partially over an external surface, diverting at least a portion of the fluid to a propulsion system, and generating propulsion at least in part from the first fluid. In response to traveling in the supercavitation mode, the vessel can travel at high-speeds with a majority of the hull below a surface of a body of water.

A vessel configured for transporting cargo can be configured to operate in a supercavitation mode, the supercavitation mode including releasing a fluid at least partially over an external surface, diverting at least a portion of the fluid to a propulsion system, and generating propulsion at least in part from the first fluid. In response to traveling in the supercavitation mode, the vessel can travel at high-speeds with a majority of the hull below a surface of a body of water.

A water craft comprising: an elongated hull comprising a passageway having an inlet and an outlet; a pump jet disposed within said passageway intermediate said inlet and said outlet; said pump jet being configured to receive water entering said passageway through said inlet and pump said water out of said outlet, whereby to propel said hull through water; a plurality of nozzles disposed on the outer surface of said hull, aft of said inlet, wherein said plurality of nozzles are configured to release a friction-reducing fluid, whereby the friction-reducing fluid displaces water from the surface of said hull so as to diminish friction on the outer surface of said hull and facilitate high speeds.

A submersible vessel comprising: an elongated hull; at least one propeller mounted on a forward end of said hull and adapted to move said hull through water; said at least one propeller being of a size and configuration such that when it is rotated at an appropriate speed, it generates supercavitated water flowing from said at least one propeller and thence along an outer surface of said hull so as to diminish friction on the outer surface of said hull and facilitate high underwater speeds.

A marine vessel comprising a command module, first and second buoyant tubular foils, and first and second struts for connecting the first and second buoyant tubular foils to the command module, respectively, wherein the first and second buoyant tubular foils provide substantially all buoyancy required for the marine vessel, and wherein the marine vessel further comprises first and second engines enclosed within the first and second buoyant tubular foils, respectively, and first and second propulsion units connected to the first and second engines, respectively, for moving the marine vessel through water, and means for reducing drag on the vessel as the vessel moves through water.