17 results about "Supercavitation" patented technology

The invention discloses a supercavitation vehicle effluent trajectory prediction method based on BO-FNN. The method comprises the following steps: step 1, constructing a CFD basic mathematical model; 2, based on the mathematical model, boundary condition setting and mesh generation are carried out on the external flow field of the aircraft, and a simulation model is obtained; 3, verifying the simulation model to obtain a numerical model of the water outlet process; 4, an orthogonal test is designed, and a water outlet trajectory data set is obtained according to the numerical model; step 5, designing a feedforward neural network, and fitting the water-out trajectory data set to obtain a water-out trajectory prediction model presenting an over-fitting characteristic; and step 6, optimizing the water outlet trajectory prediction model to obtain a supercavitation vehicle water outlet trajectory prediction model based on the BO-FNN. According to the supercavitation aircraft water outlet trajectory prediction method based on the BO-FNN, the problems that the supercavitation aircraft water outlet process is high in nonlinearity, and prediction cannot be carried out under the multivariable coupling condition are solved.

The invention provides a nanobubble generating device. The nanobubble generating device comprises a front shell, an impeller, a rotational flow device, an air-permeable component and a rear shell, a liquid inlet is formed in one end of the front shell, the other end of the front shell is connected with the rear shell, and an air inlet is formed in the wall surface of the front shell; an impeller is mounted in an inner cavity of the front shell; the impeller is internally provided with a gas flow channel, the gas flow channel is communicated with the gas inlet, part of outlets of the gas flow channel are located on the surfaces of the blades generating the supercavitation bubbles, and the supercavitation bubbles collide with bubbles of part of the outlets; the other part of outlets of the gas flow channel are communicated with the breathable component; a plurality of second air holes are formed in the surface of the air-permeable component in the rear shell; a rotational flow device is arranged in the front shell or the rear shell and used for enabling the liquid to rotate, and then gas flowing out of the second gas holes is sheared on the surface of the breathable component. According to the invention, a large amount of nano-scale bubbles can be generated.

The application provides a supercavitation projectile cross-medium water entry interference suppression method based on optimization of a cymbal length, comprising the following steps: S1, establishing a projectile-cymbal parameterized model, and demarcating an optimization interval of the cymbal length; S2, coupling a multiphase flow model, a cavitation model and a dynamic grid method to simulate a separation process of the projectile and the cymbal, and obtaining original data of the projectile; S3, performing comparative simulation of multiple groups of different cymbal lengths, and quantitatively extracting three key performance indexes of a supercavity symmetry, a pitch angle deviation and a speed attenuation rate by using the original data of the projectile; and S4, establishing a multi-target optimization criterion based on an interference index, determining a globally optimal cymbal length parameter, and completing the whole optimization process. The application can solve the problem caused by improper design of the cymbal length when the supercavitation projectile and the cymbal cooperatively enter water.

The invention relates to a supercavitation navigation body water tunnel test high-temperature air supply system and an operation method, the supercavitation navigation body water tunnel test high-temperature air supply system comprises an air source supply processing device, the output end of the air source supply processing device is connected in series with a first-stage pressure reducing valve and a second-stage pressure reducing valve through a pipeline, the output end of the second-stage pressure reducing valve is connected with a buffer air cylinder, and the top of the buffer air cylinder is provided with a safety valve; the output end of the buffer gas cylinder is divided into two paths, one path is connected with an electric heater through a mass flow controller and a first one-way valve, and the other path is communicated with a three-way pneumatic electromagnetic valve through a gas tank pressure reducing valve; the output end of the electric heater is further communicated with a three-way pneumatic electromagnetic valve through a check valve, the three-way pneumatic electromagnetic valve is divided into two branches again, one branch is communicated with an outlet water tank through a second one-way valve, and the other branch is communicated with a test water tunnel outlet pipeline through a third one-way valve. The water tunnel test of air source state adjustment can be completed in a high temperature range of 0-600 DEG C, and the use requirement is met.

The application belongs to the field of underwater vessels, and particularly relates to an underwater unmanned vehicle. In order to enable the underwater unmanned vehicle to navigate at a high speed and have good self-stability, the application discloses an underwater unmanned vehicle. The underwater unmanned vehicle comprises a front cabin section, a turning section and a rear cabin section, the turning section comprises a front connecting piece and a rear connecting piece, the front connecting piece and the rear connecting piece are respectively provided with front perforations and rear perforations, the front cabin section is provided with at least two jet spouts, the rear cabin section is provided with a cavitation generator, the cavitation generator is connected with a gas guide pipeline, and the front end of the gas guide pipeline is connected with the jet spouts, so that when the cavitation generator is started, high-pressure gas in the cavitation generator is sprayed out from all the jet spouts to form a supercavitation, thereby improving the maximum navigation speed of the underwater unmanned vehicle. By placing the cavitation generator at the rear, the distance between the center of mass and the center of buoyancy can be increased, thereby improving the self-stability of the underwater unmanned vehicle when navigating underwater.

This invention discloses a method for designing ventilation parameters for a supercavitating vehicle. Referring to the vehicle's shape and speed, the required ventilation volumetric flow rate for generating a suitable cavitation bubble size is calculated using the ventilation rate formula. The gas density inside the bubble is determined based on the environmental pressure and required cavitation number. The combustion surface of the solid propellant grain in the gas generator is designed in conjunction with fuel characteristics. Supercavitating vehicles designed using this invention are launched from underwater UUVs and surface ships, primarily for countering underwater targets. The method of this invention can efficiently obtain the ventilation parameters required for generating the appropriate supercavitation size when the vehicle is operating under variable conditions. Furthermore, through reasonable propellant design, the supercavitation size of the vehicle can be easily changed to adapt to changes in operating conditions. This avoids the problem of the vehicle not being fully covered by a supercavitation size that is too small after changing operating conditions, as well as the waste and even performance degradation caused by a supercavitation size that is too large.

The present disclosure provides a drag reduction device for an amphibious vehicle body using supercavitation for navigation on water. The device includes an exhaust gas collection device, a compressed gas storage device, an expansion unit, a thermostat, a gas delivery assembly, and a supercavitation launch device. The exhaust gas collection device collects and filters the exhaust gas generated by the amphibious vehicle engine, and compresses and stores it in the compressed gas storage device. During use, the gas is pressure- and temperature-regulated by the expansion unit and the thermostat, and then delivered to the supercavitation launch device provided at the bow of the amphibious vehicle body via the delivery assembly. The gas with the required pressure and stable temperature is emitted outward through the holes on the supercavitation launch device, forming supercavitation around the holes for drag reduction. The use of the present invention can reduce the resistance encountered by an amphibious vehicle during navigation on water.

The invention discloses a supercavitation vehicle maneuvering navigation dynamic allocation control method considering optimal efficiency, and belongs to the technical field of underwater vehicle control. The method comprises the following steps: establishing an attitude control prediction model of a supercavitation navigation body, and constructing an efficiency evaluation function fusing control precision and control energy consumption; constructing a nonlinear model prediction controller based on the model and the function, and setting a constrained optimization problem and a solving algorithm thereof to complete controller construction; and in each control period, solving an optimization problem through the controller, adjusting a predictive control sequence by using a nonlinear optimization algorithm, and determining optimal allocation by taking the minimization of an efficiency evaluation function as a target to obtain an optimal control sequence. According to the method, the adaptive dynamic distribution of the control instruction among the plurality of execution mechanisms is realized through the NMPC framework, and the problems of low control efficiency and high energy consumption of the supercavitation navigation body in the maneuvering navigation process are effectively solved.

The invention discloses a cross-medium aircraft high-speed water outlet flexible load reduction rectifying device, and relates to the technical field of cross-medium aircraft structure protection. The device conformally wraps the head of the aircraft and sequentially comprises an inner side bonding layer, an anti-static pressure air bag layer, an energy absorption foam layer and an outer side protection layer from inside to outside, underwater collapse is prevented through the internal pressure of preset gas of the anti-static pressure air bag layer, and low-frequency large-displacement buffering is provided through the compressibility of the gas at the water outlet moment; high-frequency impact is absorbed through deformation of the energy-absorbing foam layer, and transition from a blunt-end inner shape to a pointed-end outer shape is achieved. And supercavitation is formed through the streamline shape, so that the water outlet resistance is reduced. Through the material, shape and thickness design of each layer, water outlet resistance reduction and pressure resistance keeping in a deep water environment and efficient buffering at the water outlet moment are achieved, the underwater launching success rate is effectively increased, and precise instruments at the head of an aircraft are protected.

This invention discloses a high-temperature variable-component gas supply system for ventilated supercavitation water tunnel experiments, including a gas source module, which is sequentially connected to a heating module and a gas distribution module via pipelines. It also includes a data acquisition module, with the gas source module and heating module connected to the data acquisition module via signal lines. This invention also discloses an operation method for the high-temperature variable-component gas supply system. This invention solves the problem in existing water tunnel ventilated supercavitation experiments that it is impossible to simultaneously generate, regulate, and supply high-temperature variable-component gas containing condensable phases.

The invention discloses a supercavity form evolution characteristic dimensionality reduction analysis method based on principal component analysis, and relates to the technical field of ship and ocean engineering. In order to solve the defects that in the prior art, supercavity high-dimensional evolution data is difficult to process efficiently, an objective dimension reduction extraction means is lacked, and correlation analysis of principal component and physical evolution characteristics cannot be realized, the technical scheme provided by the invention is as follows: a supercavity form evolution characteristic dimension reduction analysis method based on principal component analysis is provided. Comprising the following steps: collecting multi-dimensional feature data in a supercavitation evolution process and carrying out normalization processing; performing principal component analysis on the normalized feature data, and extracting a plurality of previous principal components for dimension reduction; and a step of constructing a principal component visualization model and analyzing the physical meaning corresponding to the principal component. The device is suitable for supercavitation drag reduction research of underwater high-speed navigation bodies.

A supercavitation-enhancing paint formulation is disclosed for reducing hydrodynamic drag in underwater applications. The coating comprises a hydrophobic base, nano-additives for cavitation promotion, friction-reducing polymers, and gas-releasing agents. The formulation facilitates vapor layer formation around high-speed objects, improving propulsion efficiency. The paint is applied via a multi-layer process and heat-cured to enhance durability. This innovation enables sustained supercavitation without mechanical modifications, improving performance for underwater vehicles and projectiles.

The invention discloses a response prediction method for a ventilation supercavity flow pattern in a navigation depth change process. The method comprises the following steps: step 1, constructing a mathematical model; 2, on the basis of the mathematical model, boundary condition setting and mesh generation are carried out on the watershed of the aircraft, and a numerical calculation model is obtained; 3, verifying the numerical calculation model to obtain a ventilation supercavitation numerical calculation model suitable for the variable navigation depth condition; and 4, based on the supercavitation numerical calculation model, performing simulation calculation on the ventilation supercavitation flow field under the variable navigation depth condition to obtain a simulation result. According to the response prediction method for the ventilation supercavity flow pattern in the navigation depth change process, the problem that the flow pattern change and response of the cavity in the navigation depth dynamic change process of the supercavity vehicle cannot be predicted in the prior art is solved.

The application relates to a supercavitation vehicle cavitator rudder structure, a vehicle and a control method. The cavitator rudder is arranged at the front end of the vehicle, the whole flow surface is wet, and stable and clear steering torque is provided for the vehicle. The first rotating shaft and the second rotating shaft are arranged orthogonally, the cavitator rudder movement is decomposed into independent yaw and pitch dimensions, the driving mechanism one 5 and the driving mechanism two 6 independently drive corresponding channels respectively, movement interference is eliminated, and steering actions can be executed independently or synchronously. The structure replaces the traditional tail rudder, and tail flow field interference and additional navigation resistance are avoided.

The application provides a supercavitation vehicle long-distance stable navigation control method, and belongs to the technical field of supercavitation vehicles.The control method is as follows: S1, obtaining the geometric shape and dynamic parameters of the supercavitation vehicle and control targets; S2, establishing a cruising supercavitation vehicle dynamic model; S3, establishing a water-entry supercavitation vehicle dynamic model; S4, designing an underwater turning and cruising stage control module, and controlling the supercavitation vehicle navigation through the underwater turning and cruising stage control module in combination with the cruising supercavitation vehicle dynamic model and the water-entry supercavitation vehicle dynamic model.The application solves the problem that the current supercavitation vehicle has not formed a whole process stable navigation control technology from water entry, turning to cruising, the dynamic characteristics and environmental configuration are not comprehensive enough, and a comprehensive whole process trajectory control strategy has not been formed, and has the advantage of comprehensive stable control.

The application discloses an underwater vehicle driven by energy storage compressed gas based on supercavitation drag reduction and a driving method thereof. The application uses a power system of compressed gas expansion to provide power for the underwater vehicle, and meanwhile, waste gas of the power system generates a supercavitation to reduce the drag of the vehicle, so that the traditional lithium battery underwater vehicle power system is replaced. The method of coupling the power system and the drag reduction system increases the compactness of the system, reduces the navigation resistance, effectively improves the navigation speed, the endurance time and the high-speed maneuverability of the underwater vehicle, and good benefits are obtained.

The invention provides a water entry experiment system of an underwater vehicle and an experiment method of the water entry experiment system, and belongs to the technical field of underwater vehicle experiments. Comprising a water tank, a high-speed camera and a launching assembly, the top of the water tank is open, an elastic bullet attaching layer is arranged at the bottom of the water tank, the high-speed camera is arranged beside the water tank, the launching assembly comprises a coil gun launcher and a control unit, and the coil gun launcher comprises a launching support, a gun barrel, a coil, a photoelectric switch and a capacitor; the multiple sections of coils are wound on the gun barrel in the length direction of the gun barrel, each section of coil is correspondingly connected with a capacitor, a photoelectric switch is arranged between every two adjacent coils, the control unit comprises a controller, an external power supply, a boost switch and a silicon controlled trigger switch, and each section of coil is connected with the corresponding capacitor in series through the silicon controlled trigger switch. By optimizing and improving the defects of the traditional experimental device for the supercavitation projectile, the accuracy and reliability of the experiment can be improved.