891 results about "Shock wave" patented technology

An exemplary catheter for use in a body lumen comprises: a catheter body; and a plurality of shock wave emitters disposed at a distal end of the catheter body, each shock wave emitter configured to generate a shock wave that propagates distally of the catheter body, wherein the plurality of shock wave emitters are arrayed about a longitudinal axis of the catheter body such that shock waves emitted from the plurality of shock wave emitters can constructively interfere distally of the catheter body, and wherein each shock wave emitter comprises electrodes separated by a spark gap and at least one electrical connector that connects at least one of the electrodes to an electrode of another shock wave emitter of the plurality of shock wave emitters.

Described herein are shock wave catheters having discontinuous emitter bands. The catheters may be used for treating occlusions in a body lumen. In some examples, the catheters include an elongated tube, a shock wave electrode assembly at least partially embedded within the elongated tube, and an enclosure surrounding the shock wave electrode assembly. In some examples, the electrode assembly includes an emitter band at least partially encircling the elongated tube, the emitter band forming a first electrode of an electrode pair, and one wire having a distal end forming a second electrode of the electrode pair. The shock wave electrode assembly is configured to emit a shock wave when a voltage pulse is applied across the electrode pair. In some examples, the at least one emitter band is compressible to reduce a diameter of the emitter band.

The invention discloses a high-pressure soft water medium treatment and supply system, which belongs to the technical field of seawater desalination treatment, and comprises a multi-dimensional ion detection module for detecting the concentration distribution characteristics of target inhibition ions in original seawater to generate a corresponding coating material selection instruction; the electric field dynamic coupling module captures a termination signal according to the coating material selection instruction; the shock wave generation module starts a main pump to generate fluid shock waves to execute sediment breaking action according to the termination signal; the monitoring module is used for monitoring the finally output softened water ion concentration and reversely calculating the pollution index of the coating surface; and the heat cycle feedback device is used for starting a self-cleaning mode according to the pollution index and transmitting waste heat in the cleaning process to the pump set. The electric field dynamic coupling adsorption and fluid shock wave cooperative treatment technology is adopted, high-efficiency ion capture, dynamic sediment removal and waste heat recycling can be achieved, energy consumption is remarkably reduced, and continuous and stable operation of the system is guaranteed.

The invention provides a side slope crack passive source seismic wave imaging method, which adopts a multi-wave multi-component seismograph to simultaneously collect a plurality of seismic wave signals on three components, including surface waves, body waves and the like. According to the design, the richness of the data is remarkably improved, so that the physical characteristics of various seismic wave signals can be comprehensively utilized for inversion analysis in data processing. Through combined processing and constraint of different wave types, the problem of multiplicity of solutions in geophysical inversion can be effectively reduced, and the stability and reliability of a result are improved. In addition, due to acquisition of multi-component data, imaging is more comprehensive, and particularly, the method has obvious advantages in description of fracture directivity and geometrical characteristics.

The invention relates to the technical field of action analysis, in particular to a laser targeting training management system which comprises an immersive training environment module, a biological characteristic analysis module group, an intelligent trajectory management module group, a federal learning center module group, a tactical training management module group and a command and control system module group. Compared with the limitation of lack of battlefield dynamic complexity simulation by adopting a static preset scene in the prior art, the scheme deeply integrates multi-physical field environment control, intelligent target dynamic coordination and a cross-sensory feedback technology to construct an immersive battlefield space with temperature and humidity gradient adjustment, explosion shock wave simulation and geographic space accurate reconstruction linkage; therefore, multi-dimensional collaborative transition from single-dimensional visual simulation to tactile sense / auditory sense / olfactory sense / somatosensory is realized, so that soldiers can obtain subversive environment adaptability and tactical decision-making ability exercises in a comprehensive battlefield pressure environment close to reality.

The invention belongs to the technical field of computational fluid dynamics, and discloses a numerical simulation method for supersonic shock wave turbulence interference, comprising the following steps: S100 initializing flow physical quantities in the Reynolds-averaged Navier-Stokes equations and turbulence characteristic quantities in the #imgabs0#SST turbulence model equation; S200 solving the RANS equation to obtain the #imgabs2# at the #imgabs1#th moment; calculating the scale-reduced dimensionless adverse pressure gradient quantity #imgabs3# according to the correlation value obtained in S200; calculating the adjustment function #imgabs5# according to the #imgabs4# value obtained in S300 to obtain an improved turbulent kinetic energy generation term #imgabs6#; solving the improved #imgabs8#SST turbulence model equation according to the #imgabs7# obtained in S400 to obtain #imgabs9#; substituting the #imgabs10# obtained in S500 into S200, and solving it iteratively until the RANS equation residual is Res n Less than a certain value e or reach the maximum number of steps N = N max When , the iterative solution stops. According to the average value of the latest flow physical quantity output by S600 #imgabs11#, the numerical simulation ends.

The invention discloses a heat exchanger and method for rare gas preparation, and relates to the technical field of heat exchangers, the heat exchanger comprises a heat exchange mechanism, the outer surface wall of the heat exchange mechanism is sleeved with a cleaning structure, the input end of the heat exchange mechanism communicates with a feeding mechanism, and an aeration mechanism is inserted into the inner surface wall of the heat exchange mechanism. In the cleaning process, the second air pump conveys outside air to the aeration ball, so that a large number of bubbles are formed in cleaning liquid, dirt is cleaned by means of tiny shock waves and high-speed micro jet flow generated during bubble movement and breakage, and the ultrasonic generator can release sound wave energy; the synergistic effect of bubbles and sound waves greatly improves the cleaning efficiency and effect, enhances the stripping capacity of dirt on the inner wall of the heat exchanger, ensures that rare gas is not polluted in the heat exchange process, maintains the high purity of the rare gas, keeps the inner wall of the heat exchanger smooth, and improves the heat transfer efficiency, so that the cooling or heating speed of the rare gas is increased, and the service life of the heat exchanger is prolonged. The efficiency of the whole preparation process is improved.

The invention discloses a hypersonic flow instability multi-field coupling prediction method and system, and relates to the technical field of modern high-speed aircraft design, and the method comprises the steps: obtaining the multi-physical field parameter distribution of a hypersonic flow field; based on a shock wave-boundary layer interaction mechanism, constructing an instability sensitive graph data structure by taking multi-physical field parameters as input, setting graph nodes in a shock wave influence region, a boundary layer region and an intersection region thereof, and calculating connection weights among the nodes; performing multi-scale decomposition on the instability sensitive graph data structure, and extracting instability modes of a shock wave scale, a vortex scale and a molecular scale; screening the instability modes by adopting a hypersonic velocity stability criterion, and determining a dominant instability mode; and constructing an instability evolution prediction model based on the dominant instability mode, and outputting a spatio-temporal evolution rule of hypersonic flow instability. According to the method, the problem that the flow instability phenomenon in the hypersonic velocity complex multi-physical field environment is difficult to accurately predict can be solved.

The invention discloses an aerodynamic configuration structure of a precision guidance assembly and a design method, and belongs to the technical field of precision guidance, an assembly precursor adopts continuous three-section curve design: a supersonic speed section adopts a parabola profile, is provided with ribs on the surface, and is used for optimizing shock wave control under a supersonic speed working condition; the transonic speed section adopts a hyper-ellipsoid curved surface, ribs are arranged on the surface of the transonic speed section, and metamaterials are attached to the ribs and used for restraining transonic speed separation; the subsonic speed section adopts arc transition, and ribs are arranged on the surface and used for improving the lift force efficiency of the control surface; wherein the curvatures at the joints of the three sections of curves are continuous. According to the method, supersonic velocity-transonic velocity-subsonic velocity three-section collaborative design is realized, and meanwhile, a boundary layer is improved from a microscopic level by combining a collaborative drag reduction design of a microscopic rib and metamaterial technology, and the performance of a guidance assembly is optimized and improved.

The invention discloses a self-adaptive parameter identification method for an SST turbulence model in shock wave boundary layer interference, and the method comprises the steps: S1, constructing a high-dimensional sample space according to a closed parameter interval range of the SST turbulence model under a determined working condition, carrying out the optimal Latin hypercube sampling, and uniformly obtaining the sample information in the whole space, and enabling the sample information to serve as an input parameter sample; s2, performing numerical simulation based on an input parameter sample and a determined working condition to form a model prior sample set; s3, according to the model prior sample set, constructing a flow field wall surface pressure prediction model under shock wave boundary layer interference based on an improved Bayesian neural network; and S4, based on the flow field wall surface pressure prediction model under the interference of the shock wave boundary layer, performing adaptive parameter identification on the SST turbulence model by adopting a particle swarm optimization algorithm to obtain the optimal closing parameter of the SST turbulence model for realizing the high-precision simulation of the flow field. According to the method, the numerical simulation precision and speed are improved, and technical support is provided for safe and reliable work of the scramjet engine in a complex environment.

The invention discloses a high-voltage direct-current line EM lightning arrester valve plate shunting non-uniformity test system and method, and belongs to the technical field of lightning arrester performance test.The method comprises the steps that S1, a high-voltage direct-current power transmission system simulation model is established, and the discharge current of an EM lightning arrester under the severe working condition of single-pole line short circuit is evaluated based on the high-voltage direct-current power transmission system simulation model; adopting square-wave pulse approximate discharge current, and determining the total amplitude and square-wave pulse width of long-wave discharge current of the EM lightning arrester; s2, applying the square wave pulse to the tested EM lightning arrester resistor discs through a shock wave test platform, and testing the current magnitude and the total current of each resistor disc of the EM lightning arrester under the working condition; the total amplitude and the square wave pulse width of the preset square wave pulse are the same as the total amplitude and the square wave pulse width of the long wave of the discharge current of the EM arrester; and S3, according to the current of each resistor disc and the total current, calculating a current non-uniform coefficient and the current range of the resistor discs. According to the invention, the current distribution non-uniformity of the multi-column parallel lightning arrester can be tested and evaluated more reasonably and comprehensively.

The invention relates to the technical field of medical instruments, in particular to an electromagnetic focusing extracorporeal shock wave pancreatic lithotripsy device and method.The electromagnetic focusing extracorporeal shock wave pancreatic lithotripsy device comprises a device body, a bed body is installed on one side of the device body through a supporting frame, and a lithotripsy notch is formed in the side, close to the device body, of the bed body; a large C-shaped arm and a small C-shaped arm installed on the inner side of the large C-shaped arm are installed at the position of the notch of the device body, an X camera imager is installed at the upper end of the large C-shaped arm, and a shock wave generator and an ultrasonic probe installed on one side of the shock wave generator are installed on the small C-shaped arm. An energy adjusting module used for controlling the shock wave generator and a safety detection module used for detecting the skin temperature are arranged in the device body, and a displayer and a human-computer interaction interface are arranged on one side of the device body. The technical scheme in the prior art has limitations on shock wave generation, positioning precision, energy regulation and control and treatment strategies.

The invention provides a surface treatment method based on laser shock, and relates to the field of laser processing. The surface treatment method based on laser shock comprises the steps that a metal mold with a hollow area is placed between a to-be-treated metal sample and a restraint layer, laser beams irradiate the to-be-treated metal sample in the direction perpendicular to the restraint layer, and patterns are formed on the to-be-treated metal sample under the action of laser shock waves; wherein the energy density of the laser shock waves is smaller than 3.25 GW / cm < 2 >, the thickness of the metal mold is larger than 10 micrometers, and the pulse width of the laser shock waves is smaller than 30 ns. The laser-induced shock wave load is utilized, the surface strengthening effect and the patterning effect are introduced at the same time, the anti-deformation surface with the patterning array can be manufactured, the abrasion resistance and durability of the metal sample to be treated can be enhanced, and the problem that an existing surface patterning technology is poor in durability is effectively solved.

The invention discloses a method and a device for removing gas-liquid inclusion in quartz sand. The method comprises the following steps: S1, roasting quartz raw ore; s2, carrying out water quenching and high-voltage electric pulse treatment on the quartz ore subjected to roasting treatment in S1; and S3, purifying the quartz ore obtained in the step S2 to obtain the high-purity quartz sand. According to the method, when the quartz is treated through high-voltage electric pulse water quenching, plasma explosion, thermal stress expansion and the like are generated on a mineral interface, then shock waves and a destructive power field are formed, cracks are generated and expanded, and expansion cracks are generated on the mineral interface in ores while monomers dissociate the quartz and gangue minerals are removed; a discharge channel is established for gas-liquid inclusions and impurities wrapped by the gas-liquid inclusions, damage to aggregative fluid inclusions on the surface layers of quartz particles is intensified, and a high-purity quartz sand raw material with higher quality is provided for semiconductors and photovoltaic quartz glass products.

The invention discloses an electric pulse and salt crystallization synergetic coal seam anti-reflection system and method, and the system comprises a salt solution preparation tank which is internally provided with a Na2SO4 saturated solution; one ends of the first high-pressure water injection pump and the second high-pressure water injection pump are respectively communicated with the salt solution preparation tank, and the other ends of the first high-pressure water injection pump and the second high-pressure water injection pump are respectively communicated with the negative electrode drill hole and the positive electrode drill hole through a first pipeline and a second pipeline; the positive electrode end of the electric pulse generating device is connected with a positive electrode, the positive electrode is arranged in the positive electrode drill hole, the negative electrode end of the electric pulse generating device is connected with a negative electrode, the negative electrode is arranged in the negative electrode drill hole, and the electric pulse generating device is configured to generate a large number of microfractures in the coal body by utilizing the electrogenerated shock wave and the Joule heating effect and drive the Na2SO4 saturated solution to diffuse towards the deep parts of the fractures; and the first cooling jet device and the second cooling jet device are respectively communicated with the negative electrode drill hole and the positive electrode drill hole and are configured to respectively inject a low-temperature medium into the negative electrode drill hole and the positive electrode drill hole.

The invention discloses a digital twin-driven data-enhanced aviation undercarriage laser shock peening monitoring method, and belongs to the field of aviation structural member remanufacturing, intelligent manufacturing and data driving regulation, and the method comprises the steps: building a fatigue evaluation system for an alternating load in an undercarriage service process, recognizing a high stress concentration region, and carrying out the recognition of a high stress concentration region; a multi-modal monitoring system is constructed, impact data is expanded by adopting a data enhancement method, an impact strengthening physical model is constructed in combination with finite element analysis, impact wave propagation and residual stress evolution are simulated, and collaborative optimization of data driving and mechanism modeling is realized in combination with an experimental data correction model. Impact quality is evaluated based on deep learning, multi-modal data is fused to analyze impact uniformity, and an enhanced abnormal region is identified. And the impact process parameters are optimized through reinforcement learning, and intelligent feedback regulation and control are achieved. According to the method, multi-modal monitoring, data enhancement, physical modeling and intelligent optimization are combined, the stability of laser shock peening is improved, and the fatigue life of laser shock peening is prolonged.

The invention discloses a flow field key structure detection and feature point extraction method based on an optimized YOLO model, and the method comprises the steps: S1, obtaining flow field time sequence schlieren images of an air-breathing aircraft under different working conditions through a high-speed schlieren collection system in a wind tunnel test; s2, preprocessing the flow field time sequence schlieren image to obtain a data set corresponding to the strong shock wave of the isolation section of the air-breathing aircraft, and dividing the data set into a training set, a verification set and a test set in proportion; s3, constructing an optimized YOLO target detection model, and obtaining an optimal weight model after iterative training and verification; and S4, adopting the optimal weight model to complete target detection and feature point extraction of the test set or the schlieren image to be detected. According to the method, the target area is focused through area cutting, meanwhile, a targeted data enhancement strategy of Gaussian noise, brightness adjustment, contrast ratio adjustment and saturation is designed, a high-quality annotation data set is constructed, and the model detection precision is effectively improved.

The present invention discloses a CT inversion method with integrated fusion of dual-source shock waves. The method adopts the mutual fusion of active source and passive source. A small number of artificial seismic sources are deployed to obtain the active source data. Then, the passive source data collected by the microseismic monitoring system is obtained. The two are fused for joint inversion, thereby obtaining an inversion result. Due to the combination of the passive source data, only a small number of artificial seismic sources need to be deployed during inversion, so the scope of downtime required for inversion is relatively small. At the same time, due to the addition of the active seismic source, the required passive source data is greatly reduced. Under the premise of ensuring the inversion accuracy, the inversion cycle of the passive source CT can be shortened at the same time, thereby eliminating the need to wait for a long time for inversion each time. Therefore, under the premise of ensuring the inversion accuracy, the present invention can reduce the number of artificial seismic sources deployed and the scope of downtime required for inversion, and can greatly shorten the inversion cycle required for each inversion of the passive source, thereby facilitating long-term monitoring of dangerous areas.

The application provides a highway charging load prediction method and control system based on traffic flow power. Through a second-by-second specific power model of different electric vehicle types on the highway, factors such as road slope, vehicle load, electric vehicle braking recovery characteristics, instantaneous speed and acceleration can be considered to achieve more accurate energy consumption modeling. By establishing a specific power operation mode distribution library of different vehicle types, using a shock wave model and a cellular transmission model to solve, quantifying the congestion propagation process, dynamically correcting the specific power calculation parameters, only the road section parameters and average speed are needed to calculate the energy consumption under complex road conditions. The driver's range anxiety is quantified as a dynamic variable, and charging decision rules are established for different scenarios. The charging probability is dynamically corrected based on the queue length, weather, and driver type, and an electric vehicle charging time prediction model is established based on different service area charging scenarios.

The present invention provides an anti-resonance large-caliber three-eccentric metal hard-sealed butterfly valve, which relates to the technical field of butterfly valves and comprises: an outer cylinder, a base, a top cover, an oil cup and an anti-vibration cylinder; a card slot is provided on the inner wall of the outer cylinder, and two groups of grooves are provided at the left and right ends of the outer cylinder, and sealing rings are installed in the grooves; the base bolts are installed at the upper end of the outer cylinder, and a worm gear shaft is connected to the upper shaft of the base, and the worm gear on the worm gear shaft is one-fourth of the size of an ordinary worm gear; the position of a cleaning roller is adjusted by loosening a butterfly nut so that the cleaning roller contacts the worm, and when the worm is rotated, the cleaning roller can sweep the dust on the worm to prevent the worm from being covered with dust and causing difficulty in the rotation of the worm; a water hammer effect occurs when the sealing plate is opened and closed, and when a shock wave is transmitted into the buffer cylinder, the shock wave acts on the piston, and the piston moves upward, which can effectively eliminate irregular shock wave oscillations and prevent the butterfly valve from resonating with the water flow and generating noise when in use.

The invention discloses a shock wave diffusion process testing method based on double cameras and digital schlieren. The method comprises the steps that two high-speed cameras are used for shooting digital schlieren images generated in the shock wave diffusion process; performing image splicing on the acquired images shot by the double cameras; the position of the shock wave is calculated through the spliced image, shock wave position data at different moments are obtained, and the speed of shock wave propagation in the x-axis direction and the y-axis direction is obtained. Based on binocular vision, a digital schlieren system is adopted to collect an air flow field information image containing a shock wave propagation process; splicing of double-camera images is achieved through an improved homography matrix method, the shock wave testing range is expanded, the whole shock wave propagation process is successfully captured, the shock wave diffusion testing accuracy is improved, and visual monitoring of wave types represented by shock waves in various transparent media can be achieved.

The invention discloses a method for predicting shock waves through a multi-region conservation enhanced physical information neural network, and belongs to the field of flow field prediction of shock waves and strong nonlinear physical phenomena in high-speed flow, and the method comprises the steps: S1, carrying out numerical simulation through fluid dynamics software to obtain a reference flow field solution of a to-be-solved N-S control equation, the verification module is used for verifying a model solving result; s2, constructing a neural network comprising an integral layer, a micro-layer and a loss function error layer; s3, constructing a physical information neural network; s4, training is carried out after physical information neural network training parameters are set, and whether a convergence standard is met or not is determined by constructing a joint loss function corresponding to the physical information neural network; and S5, applying the trained neural network model to shock wave prediction of high-speed flow field simulation under different working conditions. Through the multi-region local conservation constraint, the width of the shock wave transition region is effectively compressed, so that the relative error of the physical quantity is obviously reduced compared with the existing method.

The invention relates to the field of aircraft hydraulic control element machining, and particularly discloses an aircraft hydraulic kinematic pair valve element lubricating structure laser surface texturing method which comprises the steps of lubricating spherical crown texture design, texturing machining path, protection cleaning, laser parameter testing, laser machining pretreatment, test piece texturing and texturing effect inspection. Machining of the micro-nano structure on the surface of the valve element of the hydraulic kinematic pair of the airplane is achieved through high-energy and short-pulse femtosecond laser, machining precision is high, controllability is high, environmental pollution is small, and compared with the prior art, abrasion of the matching face of the valve element and the cylinder sleeve kinematic pair can be reduced to a great extent; and meanwhile, high-pressure shock waves induced by femtosecond laser are utilized to form residual compressive stress on the surface of the valve element, so that oil and scrap storage and surface lubrication wear resistance of the surface of the valve element are synergistically improved, and the overall service life of the aircraft hydraulic control element is prolonged.

The invention belongs to the technical field of hypersonic flight vehicle control, and particularly relates to a hypersonic flight vehicle protection control method considering non-starting of an air inlet channel. The method specifically comprises the steps of establishing a quasi-one-dimensional nominal mechanism model to describe flow field changes of an isolation section and a combustion chamber; adopting a physical information neural network to construct a reduced-order model as a real-time agent of the quasi-one-dimensional model; designing a dual extended Kalman filtering algorithm to realize joint online estimation of model parameters and blind area states, and introducing shock wave position pseudo measurement to form multi-loop feedback; a dual-channel fusion early warning system of a model channel and an intelligent sensor channel is constructed, and robust early warning is realized through adaptive weight; and designing a continuous adaptive model prediction controller, and dynamically adjusting a control strategy according to risk indexes and parameter uncertainty to realize active protection control.

The invention discloses an electromagnetic shock wave source, which comprises a base, a sealed chamber and a plurality of groups of electromagnetic units, coils of the plurality of groups of electromagnetic units are arranged according to a certain angle, and a plurality of focuses are combined according to different ranges after focusing. And a desired large focusing area which is not limited by the central strength of a single coil and consists of a plurality of focal regions can be obtained. Meanwhile, the multiple electromagnetic units are arranged according to a certain angle, although the size of a wave source output port is larger than that of an output port of a single electromagnetic unit, the size of the wave source output port is far smaller than the sum of the sizes of the output ports of the multiple electromagnetic units, on the premise that the electromagnetic shock wave source focal region is enlarged, the equipment size is reduced, and the equipment adaptability is improved. The invention further provides pressure pulse equipment which comprises the electromagnetic shock wave source, the focal region of the electromagnetic shock wave source is enlarged, the electromagnetic shock wave technology obtains focal spots of any size, various specific treatment requirements are met, and the shock wave technology is suitable for the field needing large-area treatment and physical therapy.

The invention discloses a novel double-crystal-configuration overpressure sensor with a vibration compensation function. Based on a vibration interference arrival end compensation thought, a set of compensation sensitive element assembly is added on the basis of a traditional piezoelectric pressure sensor, a compensation sensitive element which is the same as a sensor main sensitive element in material and size and opposite in placement direction is adopted, and charges generated by vibration impact are sensed synchronously; the method is used for counteracting vibration spurious charges generated when a main sensitive element is interfered by flat plate vibration, compensation of vibration interference is achieved, and the test precision of shock wave pressure signals is improved.

The utility model relates to an aviation dynamic differential pressure propeller. The airfoil profile of the aviation dynamic differential pressure propeller comprises an upper airfoil surface and a lower airfoil surface, the section lines of the airfoils are all composed of curves of a monotonically decreasing function from the front edge to the rear edge. The structure is simple, and when the lower wing surface does work on windward airflow, the flow speed is reduced, the static pressure intensity is increased, and upward thrust is generated; the upper airfoil does not do work, airflow flows back, static pressure is reduced, upward pulling force is generated by the airfoils, so that the lift force of the upper airfoil and the lower airfoil is upward at the same time, the sum of the lift force is larger than the lift force of an existing single-face airfoil, and then the efficiency of the propeller wing is further improved by optimizing the lift-drag ratio. A front edge point is accurately positioned by adopting a wing section line rear corner, a spanwise line, a relative velocity line and a backward moving distance, a shock wave is weakened to be low-sound-velocity object surface static pressure, and the damage effect of the shock wave is avoided.

The invention relates to the technical field of natural gas extraction, in particular to a supersonic shock wave hole atomization drainage gas production device, and aims at solving the problems that in the prior art, a throttler is poor in atomization efficiency and low in drainage gas production efficiency. The device comprises a connector and further comprises an atomization device. The atomization device comprises a central pipe and a nozzle; two ends of the central pipe are communicated to form a diversion channel; the flow guide channel is provided with an inlet end and an outlet end; the connector sleeves the inlet end; the nozzle is fixedly connected with the outlet end through the nozzle connector; a groove is formed in the inner wall, close to the inlet end, of the flow guide channel, when airflow flows into the groove, shock wave turbulent flow can be generated, so that a gas-liquid mixture in natural gas can be preliminarily sheared and broken in the groove and then is sprayed out of the nozzle, the supersonic shock wave hole atomization drainage gas production device can have higher atomization efficiency, and the atomization effect is better. And the natural gas drainage gas recovery efficiency is further improved.

The invention discloses a method for improving the oxidation resistance of nickel-based superalloy, and belongs to the technical field of metal material surface modification. Based on the high-energy transient effect of laser shock waves, the method mainly comprises the key steps of alloy surface pretreatment, laser shock peening process implementation, post-treatment and the like. Specifically, firstly, the surface of the nickel-based single crystal alloy is subjected to pretreatment such as polishing and cleaning, surface defects and pollutants are removed, and the treatment quality is guaranteed; then, according to the material characteristics and performance requirements of the nickel-based single crystal alloy, laser parameters such as laser energy, pulse width and light spot diameter are accurately set, and proper restraint layer and absorption layer materials are selected; then, high-energy pulse laser is utilized to irradiate the absorption layer, high-temperature and high-pressure plasma is induced to be generated, the plasma expands and explodes to generate strong shock waves, the shock waves act on the alloy surface, the surface material is subjected to severe plastic deformation, a residual compressive stress layer with the depth capable of reaching hundreds of micrometers is formed, meanwhile, surface grains are refined, and the microstructure is optimized; and after the strengthening treatment is completed, simple cleaning and performance detection post-treatment are carried out. Through laser shock strengthening, a special organization structure with high density and low defect density is formed on the surface of the nickel-based single crystal alloy, diffusion and invasion of oxygen atoms are effectively hindered, and the oxidation resistance of the alloy is remarkably improved. According to the method, the controllability of technological parameters is high, the strengthening effect can be accurately regulated and controlled, the treatment process is free of pollution and high in efficiency, the obtained strengthened nickel-based single crystal alloy can be widely applied to the fields such as aerospace engine hot end parts and nuclear energy equipment which have strict requirements for high-temperature oxidation resistance, the reliability of related parts is greatly improved, and the service life of the related parts is greatly prolonged.

The invention relates to the field of medical instruments, in particular to a suction catheter with a shock wave thrombus breaking function, which comprises a shock wave catheter, a suction tube and a discharge mechanism, and a shock wave guide pipe is arranged in the suction pipe. According to the invention, charges are introduced into the annular electrode and the cylindrical electrode by starting the discharge mechanism, a large amount of charges are accumulated at the two ends of the positive electrode and the negative electrode to generate a strong electric field, neutral particles in a medium between the electrodes are ionized into plasma under the action of the strong electric field, and a discharge phenomenon occurs; rapid temperature change of plasmas and surrounding media generated in the discharging process causes rapid volume expansion and contraction of the surrounding media, the violent movement of particles in the media can generate pressure sound waves and transmit the pressure sound waves outwards through the media, and when the movement speed of the particles exceeds the propagation speed of the sound waves in the media, shock waves can be generated, so that the pressure sound waves are generated. When the shock wave catheter extends into the blood vessel of the human body, calcified plaques in the blood vessel can be efficiently crushed without damaging the endometrium of the blood vessel.