75 results about "Cavitation erosion" patented technology

The invention belongs to the technical field of industrial automation control, and particularly relates to a control system and method of a battery shell cleaning machine, and the method comprises the steps: obtaining a sound field signal in a cleaning tank, and carrying out the preprocessing to remove direct current drift and low-frequency mechanical vibration; the permutation entropy of the sound field signals is calculated to evaluate load complexity, a penalty factor of variational mode decomposition is adaptively constructed according to the load complexity, and then a fundamental frequency mode and a high frequency mode are separated; constructing a risk index reflecting the cavitation erosion degree according to the energy ratio of the high-frequency mode and the time domain volatility of the high-frequency mode; and according to the deviation between the risk index and the safety threshold, cooperatively adjusting the frequency jitter amplitude and the power amplitude of the ultrasonic generator. According to the method, through a self-adaptive decoupling damage signal and double-variable cooperative control strategy, on the premise that high cleaning efficiency is guaranteed, destructive cavitation and resonance damage are effectively restrained, and the balance between the cleaning effect and workpiece safety is achieved.

The utility model discloses an integrated type swing cycle pump lubricating device, including pump casing, inner rotor and outer rotor, be provided with oil cavity and with oil inlet and oil outlet of oil cavity communication on the pump casing, its characterized in that, the bottom of oil cavity is provided with annular unloading groove with oil outlet communication, and the bottom surface of annular unloading groove is multistage step surface. This integrated type swing cycle pump lubricating device can effectively buffer fluid resistance and pulsation, reduce cavitation and cavitation erosion phenomenon, and stabilize oil pressure of oil outlet.

The application discloses a novel anti-cavitation surface structure and a preparation method thereof. The anti-cavitation surface structure can change the wetting degree of a material surface, reduce gas nuclei near a liquid-solid contact surface, inhibit cavitation and cavitation erosion processes, and also reduce the damage of micro-jets to the material in the cavitation erosion process. The anti-cavitation surface structure layer is composed of a surface construction layer and a substrate. The working mechanism is as follows: firstly, the construction can change the wetting degree of the material surface, so that the gas nuclei near the liquid-solid contact surface are reduced, thereby slowing down the cavitation and cavitation erosion processes; secondly, the incident kinetic energy of the micro-jets in the effective construction area is consumed in the form of friction, thereby reducing the damage of the micro-jets to the material substrate. The application can effectively slow down the cavitation erosion process, weaken the influence of the micro-jets on the material substrate in the cavitation erosion process, and effectively resist the damage of the cavitation erosion to the material surface.

The invention discloses a sluice channel system for danger elimination of a barrier lake and a working method of the sluice channel system, and relates to the field of emergency disposal of barrier lakes. The sluice channel system comprises a sluice channel structure, an anti-scour layer and a monitoring system, the anti-scour layer comprises a plurality of air bag cushion units, and the air bag cushion units are laid on the sluice channel structure; the monitoring system comprises a flow velocity sensor and a control unit. By integrating the sluice groove structure, the anti-scouring layer and the monitoring system, dynamic regulation and control of the sluice groove scouring process can be achieved. When the flow velocity sensor detects that the water flow reaches a preset scouring critical value, the control unit starts the air bag cushion unit to sink to form a continuous anti-scouring covering layer so as to inhibit impact erosion of the water flow to the tank bottom, the anti-scouring covering layer is utilized to reduce damage of high-speed water flow phenomena such as cavitation erosion and pulsating pressure to the tank body, and the stability of the tank bottom is improved.

This application discloses an intelligent detection method and system for corrosion defects in flood discharge tunnels, relating to the field of tunnel corrosion detection technology. The method includes: generating a cavitation number distribution cloud map of the entire flood discharge tunnel area based on historical operating data; marking areas with cavitation values ​​below a preset cavitation number threshold as theoretical high-risk areas; marking areas with cavitation noise intensity exceeding a preset noise threshold as measured noise active areas; spatially superimposing and comparing the theoretical high-risk areas and the measured noise active areas to determine cavitation confirmation areas, potential cavitation risk areas, and cavitation anomaly areas; outputting a surface damage index through a pre-trained cavitation damage assessment model; calculating a dynamic cavitation risk factor; and generating a structured corrosion defect detection report. This method solves the problems of low detection efficiency, limited detection range, and difficulty in accurately assessing corrosion risk in existing flood discharge tunnel corrosion detection methods.

The application provides a water turbine flat pressure pipe cavitation erosion suppression structure based on pressure propagation timing control, which comprises a pipeline installation base and a flat pressure pipe inlet structure. The flat pressure pipe inlet structure is provided with a bottom plate part and a pipe body. A plurality of first through holes are arranged on the outer side of the pipe body along the circumference of the bottom plate part. A plurality of second through holes are arranged on the outer side of the first through holes along the circumference. A plurality of third connection interfaces are arranged on the pipe body along the length and the circumference. The pipeline installation base comprises a sleeve part. A flange part is arranged at one end of the sleeve part. The sleeve part is sleeved on the outer side of the pipe body. The sleeve part is provided with a plurality of third connection interfaces aligned with the third through holes. The flange part is provided with a plurality of first connection interfaces and second connection interfaces aligned with the first through holes and the second through holes. A pressure wave conducting pipe is communicated at each second connection interface. The other end of the pressure wave conducting pipe is closed. A plurality of communication openings are arranged on the pressure wave conducting pipe along the length direction. A plurality of timing adjustment pipes are further arranged. One end of each timing adjustment pipe is communicated with the third connection interface. The other end of each timing adjustment pipe is communicated with the first connection interface or the communication opening.

The utility model discloses an underground drainage filter head, which relates to the technical field of drainage filter heads, and comprises a cylindrical shell, a balancing weight and a buoyancy piece, a joint is arranged at the center of the top of the shell, a plurality of water inlets are uniformly arranged on the side surface of the shell, the balancing weight is arranged at the center of the upper surface of the bottom of the shell, and the buoyancy piece is arranged at the bottom of the shell. The buoyancy piece is arranged on the upper surface of the top of the shell, and the buoyancy of the buoyancy piece, the shell and the balancing weight is smaller than the gravity of the buoyancy piece, the shell and the balancing weight; the buoyancy of the buoyancy piece, the shell and the balancing weight is smaller than the gravity of the buoyancy piece, the shell and the balancing weight, the shell falls to the water bottom after being placed in water, and due to the fact that the top is light and provided with the buoyancy piece, and the bottom is heavy and provided with the balancing weight, the water drainage device can vertically stand in the water and cannot topple over, the water drainage working effect is better, and the cavitation erosion phenomenon can be avoided.

This invention belongs to the field of alloy materials technology and discloses a method for improving the cavitation erosion resistance of Fe-Mn-Al-C lightweight steel. The method involves: pretreating the Fe-Mn-Al-C lightweight steel to remove dust and impurities from its surface, obtaining pretreated Fe-Mn-Al-C lightweight steel; and then subjecting the surface of the pretreated Fe-Mn-Al-C lightweight steel to electron beam remelting under vacuum conditions to form a cladding layer on the surface of the pretreated Fe-Mn-Al-C lightweight steel, thereby improving its cavitation erosion resistance. This invention involves pretreating Fe-Mn-Al-C lightweight steel and then subjecting it to electron beam remelting. The electron beam remelting process alters the surface roughness and structure of the Fe-Mn-Al-C lightweight steel, causing the surface grains to form equiaxed and columnar crystals under the influence of the electron beam. This results in the formation of a dense and more uniform cladding layer on the surface of the Fe-Mn-Al-C lightweight steel, which not only improves the surface hardness and strength of the Fe-Mn-Al-C steel but also enhances its wear resistance, corrosion resistance, and cavitation erosion resistance.

A hydrofoil cavitating flow control structure includes a hydrofoil. A primary protuberant stripe is disposed in a middle position of a suction side of the hydrofoil, a plurality of symmetrically-distributed secondary protuberant stripes are disposed obliquely at both sides of the primary protuberant stripe, and the plurality of secondary protuberant stripes are uniformly and equidistantly distributed along the length direction of the primary protuberant stripe. By changing geometric parameters such as an included angle between the primary protuberant stripe and the second protuberant stripe, a ratio of cross section diameters and a distribution spacing of the second protuberant stripes along a chord length direction of the hydrofoil and the like, the shedding of cloud cavitation on a hydrofoil surface is effectively suppressed, and cavitation erosion and pressure pulsation generated by cavitation collapse is reduced, thus improving the operation efficiency and the service life of hydraulic machinery.

This invention relates to the field of soil slope monitoring technology, specifically to a method for monitoring cavitation erosion in dispersed soil slopes. The method involves acquiring soil moisture, soil temperature, air temperature, air humidity, current rainfall, slope runoff velocity, and images of the soil slope surface and surface water for a target dispersed soil slope. Based on these data, the method determines the rainfall erosion index and soil cavitation sensitivity index for the target dispersed soil slope. Finally, based on these indices, the method determines the risk level of cavitation erosion development for the target dispersed soil slope. This comprehensive and dynamic assessment of cavitation erosion in dispersed soil slopes improves the targeting and timeliness of slope disaster identification and diagnosis, thereby reducing slope disaster risks.

The utility model relates to the technical field of water pumps, in particular to an energy-saving water pump which comprises a water pump body and an adjusting assembly, and the adjusting assembly comprises a bottom plate and a plurality of lifting components. The lifting part comprises a connecting piece, an outer column, an inner column, a screw rod and a mounting plate; when the height of the water inlet end of the water pump body is inconsistent with that of the water pipe, a worker can rotate each screw rod and adjust the length of the inner column extending out of the outer column, and the height position of the water pump body can be adjusted, so that the height of the water pipe is consistent with that of the water inlet end of the water pump body; the straight water pipe can be connected with the water pump body, so that the energy consumption can be reduced; the inner wall of the pump cavity of the water pump body and the impeller are plated with the super-hydrophobic coatings, so that the water pump body can be protected against damage such as corrosion, rusting and cavitation erosion, the water pump body has the super-hydrophobic effect, the friction resistance is reduced, the energy-saving efficiency of the water pump body is improved, and the service life of the water pump body can be prolonged.

The utility model discloses a kind of high-pressure check valve for mud pump, it is related to mud pump technical field.The check valve includes valve cover, valve body, valve core, spring, locating support rod and the like component;Valve cover is equipped with water V mouth using V-shaped camber structure, can avoid medium flow to produce bubble, prevent cavitation erosion;Valve cover is integrally formed by thread connection with valve body, valve core is equipped with valve core structure seal, in combination with the cooperation of valve cover chamfer and valve core arc surface, realize complete sealing;Valve body is equipped with spring groove, locating hole and movement limit step, respectively guarantee spring stability, valve core accurate movement and stroke limit.The utility model solves the problem that existing check valve is easy to wear under high pressure, poor sealing, realizes long time stable work, improves the volumetric efficiency and reliability of mud pump, applicable to various high-pressure mud pump.

The utility model provides a water pump flow guide body structure assembly, and belongs to the technical field of water pump guide vanes. The problem that a water pump impeller in the prior art is prone to being affected by cavitation is solved. The flow guide impeller comprises a plurality of shells and a plurality of flow guide impellers, each flow guide impeller comprises a wheel disc and a plurality of blades, the blades are circumferentially and uniformly distributed along the periphery of the wheel disc, one end of each blade is fixedly connected with the wheel disc, the other end of each blade extends towards the rotating direction of the impeller, and the surface of each blade is of a streamline curved surface structure. One side of each blade extends out of the end face of the wheel disc to form an exposed blade structure, a pressure reduction groove is formed in the end face of each blade, a connecting hole is formed in the wall face of each pressure reduction groove, and the peripheral end and the inner side end of each blade form a guide-in section, a flow guide section and a guide-out section correspondingly. The flow guide impeller is installed in the shell, and the fixing pin is fixedly connected with the connecting hole. The utility model has the advantages of high efficiency, cavitation prevention and stress relief.

The invention provides an abrupt slope spillway overflow surface cavitation risk assessment method and system, and relates to the technical field of overflow surface cavitation risk assessment, and the method specifically comprises the steps: constructing a three-dimensional model, and carrying out the simulation to obtain the flow velocity, water pressure and cavitation number; calculating a Reynolds number, judging a flow state and determining a critical flow rate; the streamline curvature and vorticity are extracted, flow field separation is judged, and a risk correction coefficient is determined; clustering the initial high-risk grid units by adopting a recursive traversal method, and calculating a risk correction coefficient mean value of the region; and in combination with the cavitation number and the flow velocity, judging an initial risk level and assigning an interval, correcting to obtain a final risk level of each grid unit, and visually generating a cavitation risk point location distribution diagram of the high-risk area. According to the method, the divided high-risk region is clear in boundary and accurate in range, the actual distribution rule of the cavitation risk on the overflow surface is truly restored, the region cumulative effect of flow field separation is fused into a risk judgment system, and the cavitation effect that the risk of a continuous region is higher is met.

This invention belongs to the field of cavitation state prediction technology, specifically providing a method and system for predicting cavitation evolution based on multimodal information fusion. The method includes: acquiring multimodal signals of the workpiece under test in a cavitation environment and constructing cavitation state labels; performing modal-specific preprocessing and time synchronization on the multimodal signals to construct a global fusion feature set for cavitation evolution state identification; constructing a cavitation evolution state identification model; predicting the cavitation state of the target workpiece's multimodal signals to obtain the cavitation state level; and constructing a causal relationship between cavitation collapse behavior and material damage response based on the cavitation state level combined with cross-modal cavitation event correlation analysis results, thereby completing a comprehensive assessment. The multimodal information fusion method provided by this invention significantly improves the comprehensiveness, early detection, accuracy, and mechanistic interpretability of cavitation monitoring, and has outstanding practical value for promoting intelligent operation and maintenance and reliability assurance of hydraulic equipment.

The application discloses a common rail pipe with high-pressure oil pressure sealing structure and relates to the technical field of combustion engines. The common rail pipe body is provided with a pipe interface for guiding fuel, a stepped pressure release assembly arranged in the interior of the pipe interface, a tapered pipe body with gradually increasing diameter, and a first porous plate and a second porous plate capable of stepwise decompression of fuel in the pipe interface, which are used for guiding smooth acceleration of fuel in the rotating process of the stepped pressure release assembly, avoiding stress concentration of the inner wall of the pipe interface and cracks by utilizing the shearing action generated when the fuel passes through the two plate bodies, and multiple branch inclined frames are arranged in an inclined manner and are used for converting the axial flow of fuel just entering the interior of the pipe interface cavity into inclined flow, thereby avoiding long-time vertical impact of the fuel on the inner wall of the pipe interface and thereby avoiding cavitation erosion damage.

The invention relates to a test method for judging cavitation erosion of an engine cylinder sleeve by using water pressure fluctuation, which relates to the field of engines and comprises the following steps of: continuously and alternately circulating by using circulating cooling water on the outer wall of the engine cylinder sleeve; under the vibration of the cylinder sleeve and different water pressure changes, when the transient pressure of cooling water at a certain position of the cylinder sleeve is reduced to be lower than the liquid saturated steam pressure, bubbles are generated and separated out; along with the increase of bubbles, the bubbles are compressed to a certain degree under the vibration of the cylinder sleeve and the change of water pressure, and then the pressure rises to cause bursting; collecting and analyzing water pressure fluctuation data; and according to the collected data, whether the cavitation erosion phenomenon occurs in the cylinder sleeve is judged, and whether the cooling water channel needs to be redesigned is determined. The method is beneficial to quickly and accurately judging the cavitation erosion condition of the cylinder sleeve, timely discovering potential problems and taking preventive measures, prolonging the service life of the cylinder sleeve and reducing the maintenance cost.

The invention discloses a polymer coating structure for cavitation protection and a preparation method thereof. The structure is a sandwich structure formed by a material bottom layer, a porous structure layer and a surface layer. The structure is suitable for cavitation erosion protection of the surface of a base material in hydraulic machinery, the structure can be prepared and coated through a high polymer material, the structure can be formed on the surface of the base material after the material is cured, and the structure can also be generated in the form of 3D printing and the like. When cavitation bubbles generated around collapse close to the surface, the structural layer reduces the internal pressure through deformation and surface layer upheaval to balance the low pressure between the cavitation bubbles and the wall surface when the cavitation bubbles collapse, so that the collapse direction of the cavitation bubbles is changed, the impact of micro-jet generated when the cavitation bubbles collapse is remarkably inhibited, the strength of impact waves is reduced, and the cavitation bubbles are prevented from collapsing. Therefore, the purpose of cavitation erosion protection of hydraulic machinery is achieved. The invention provides a novel way with practicability and economical efficiency for cavitation protection of hydraulic machinery.

The embodiment of the present application provides an inducer and a turbopump, which are used for further improving the cavitation erosion resistance of the inducer. The inducer is suitable for a liquid rocket engine, and the inducer comprises a rotating shaft and blades fixed to the rotating shaft; a first development surface corresponding to the blades comprises a first region, and a part of the first development surface located in the first region is in a curve shape; the first development surface is a planar pattern obtained by unfolding a first section surface of the blades which is cut by a cylindrical surface of the rotating shaft on a shaft radius. The inducer and the turbopump provided by the embodiment of the present application can further improve the cavitation erosion resistance of the inducer.

The invention provides a rare earth oxide doped yttrium oxide stabilized zirconia ceramic material as well as a preparation method and application thereof, and belongs to the technical field of ceramic materials and industrial equipment protection. According to the preparation method, yttrium oxide stabilized zirconia is taken as a matrix phase, lanthanum oxide, cerium oxide, gadolinium oxide or neodymium oxide is taken as a doping phase, and the rare earth oxide doped yttrium oxide stabilized zirconia ceramic material is prepared through a solid-phase reaction and a spark plasma sintering technology. Through the microstructure and phase composition of rare earth element doped optimized yttrium oxide stabilized zirconium oxide, the cavitation erosion resistance and mechanical property of the material are remarkably improved, and the material is suitable for preparing fluid equipment runner components such as hydraulic pump impellers and valve elements.

The application discloses a three-dimensional hydrofoil cavitation erosion damage numerical prediction method based on a nonlinear cavitation model, comprising the following steps: constructing a three-dimensional hydrofoil flow field calculation domain; dividing the calculation domain into grids, and simultaneously defining the boundary positions of the calculation domain inlet and outlet, solid wall surface and symmetry surface; importing the calculation domain grid into a computational fluid dynamics simulation software, checking the grid quality and performing scale reduction; setting the boundary conditions, solving algorithm of the hydrofoil cavitation calculation, and importing the cavitation model; obtaining the hydrofoil surface cavitation periodic evolution law and cavitation erosion damage distribution characteristics through cavitation erosion prediction; comparing the calculation results of the cavitation erosion with the published test results, and correcting the hydrofoil cavitation model. The application realizes reliable and efficient prediction of the material surface damage of the three-dimensional hydrofoil under cloud cavitation conditions, provides theoretical support for revealing the cavitation erosion mechanism induced by unsteady water power cavitation, and enriches the prediction means of the cavitation erosion problem of the water power machinery with the airfoil as the basic blade unit.

The invention discloses a turbine and piston combined type seawater desalination device in the technical field of energy recovery, which comprises a seawater treatment box, a strong brine input pipe is fixedly mounted on one side of the seawater treatment box, and a turbine-piston combined type structure is arranged in the strong brine input pipe; the turbine-piston composite structure comprises a turbine unit and a piston unit, the turbine unit is composed of turbine assemblies symmetrically arranged on the two sides of the strong brine input pipe, bionic blade assemblies are arranged in the turbine assemblies, and the bionic blade assemblies are arranged in the turbine assemblies; the piston unit is located in the strong brine input pipe, and the piston unit is connected with the turbine unit through a linkage assembly; and the detection unit can detect the working condition of strong brine. The problems that a turbine type energy recovery device is narrow in adaptive working condition range, large in cavitation erosion loss, poor in corrosion resistance, low in efficiency stability and the like are solved through a turbine-piston composite structure.

The utility model discloses a large-diameter hard-seal floating V-ball regulating valve which comprises a left valve body, a right valve body, a first valve seat assembly, a second valve seat assembly, a ball valve element, a valve rod, a filler assembly, a filler pressing sleeve, a support, a supporting piece and a limiting piece. One end of the valve rod penetrates through the mounting hole and is connected with the ball valve element, and the other end of the valve rod extends out of the mounting hole and is rotationally connected with the support. A supporting piece is arranged between the valve rod and the support, one end of the supporting piece abuts against the support, the other end of the supporting piece abuts against the limiting piece, and the limiting piece is arranged on the outer side of the valve rod in a sleeving mode and fixedly connected with the valve rod. The valve rod can be limited in the axial direction of the valve rod through the supporting piece and the limiting piece. Uniform sealing of the valve can be guaranteed through the axial limiting and lifting function of the valve rod, and cavitation erosion resistance, noise reduction and vibration reduction can be effectively achieved through the noise reduction block.

The invention relates to the technical field of ship propellers, in particular to a ship propeller assembly and a machining method. Comprising a paddle rod which is transversely arranged; the reverse oblique angle of each small paddle ranges from 35 degrees to 50 degrees; and the length of each large paddle is 4.3 times that of each small paddle. Compared with the prior art, the ship propeller adopting the method for coating processing has the advantages that the propelling efficiency of the ship propeller under the rated working condition is improved by not less than 5% compared with that of a reference model, the molded surface processing precision of a propeller blade reaches + / -0.15 mm and the surface roughness Ra value is not greater than 1.6 microns on the aspect of manufacturing precision, so that the hydrodynamic performance is guaranteed, cavitation erosion inducements are reduced, and the ship propeller is suitable for being popularized and used. And meanwhile, the thickness uniformity of the coating is ensured.

The application discloses a tool microstructure processing device and method based on paddle fluid cavitation erosion. The device comprises a sealed box, a rotary driving assembly, a rotary paddle, a tool clamping assembly and a temperature control assembly. A driving rod extends into the sealed box and is driven to rotate by the rotary driving assembly. The driving rod is fixed with the rotary paddle, and the rotary paddle is installed with a plurality of tool clamping assemblies. The tool clamping assembly comprises a clamping seat and a plurality of installation slots formed in the clamping seat. In the working process, the propeller is immersed in the fluid medium mixed with micro-particles. The rotary paddle drives the processed tool to rotate at a linear speed of 27.5 m / s to 35 m / s. The application drives the processed tool to move quickly in the fluid medium mixed with micro-particles by using the rotary paddle, forms cavitation effect on the rake face of the processed tool, and quickly processes the microstructure capable of improving the cutting performance of the processed tool.

The present application relates to a kind of cavity erosion prediction method considering cavity collapse and its energy transport process, belong to the technical field of hydrodynamics research.The cavity erosion prediction method includes the following steps: solving cavitation flow field to the object to be predicted;Based on the physical property change of cavity collapse, identify collapse region and record cavity collapse pressure;According to cavity collapse pressure, calculate collapse energy;Analysis of the transport process of collapse energy radiated to the wall to be predicted position, calculate transfer parameter and attenuation parameter, and the transport parameter is obtained by multiplication;Combined with collapse energy and transport parameter, calculate the cavity erosion load of collapse energy radiated to the wall, and the cumulative cavity erosion load of the current predicted position of wall is obtained by accumulation;According to cumulative cavity erosion load, determine the cavity erosion region.The cavity erosion prediction method considers the real physical process of cavity collapse, ensures the authenticity of collapse region identification, and considers the transfer and dissipation process in energy transport, ensures the accuracy of cavity erosion region prediction.

This invention discloses a method for controlling the gradual change of multilayer composition in a liquid hydrogen pump composite coating, relating to the field of liquid hydrogen pump composite coating control technology, specifically a method for controlling the gradual change of multilayer composition in a liquid hydrogen pump composite coating. The method involves forming a bonding initiation layer on the surface of a liquid hydrogen pump substrate, followed by the sequential formation of multiple transition sublayers and a surface functional layer. After each transition sublayer is formed, a controlled perturbation is applied, and at least two types of post-layer recovery responses are collected from thermal response phase, acoustic response attenuation, and electrical recovery to generate a low-temperature recovery signature. Based on the low-temperature recovery signature, the risk type is determined, and the proportional relationship, layer thickness, and deposition energy of the toughness component, hardness component, and barrier component in the next transition sublayer are adjusted accordingly. The surface functional layer is formed after the low-temperature recovery signature continuously enters the target window, thereby obtaining a nonlinear composite gradient coating. This method is beneficial for improving the interface stability, resistance to cavitation erosion, and hydrogen barrier continuity of the liquid hydrogen pump composite coating.

An ultra-high-speed jet type liquid-solid two-phase flow erosive wear experimental device comprises an experimental box body, a normal-pressure water storage tank, a sand storage tank, a high-pressure pump station, a sand supply device, a nozzle and a carrying disc. An airborne computer is arranged in the experiment box body, and the airborne computer is provided with a touch control type operation screen; the experiment box body, the normal-pressure water storage tank and the sand storage tank are distributed in parallel, the high-pressure pump station and the sand supply device are located on the inner side of the experiment box body, and the loading disc and the nozzle are distributed in parallel; a horizontal posture adjusting mechanism is arranged above the nozzle, a suspension arm is arranged on the horizontal posture adjusting mechanism, and a three-degree-of-freedom electric manipulator is arranged between the nozzle and the bottom of the suspension arm; a rotary posture adjusting motor is arranged between the loading disc and the experiment box body; a plurality of sample placing grooves are uniformly distributed in the loading disc along the circumferential direction. According to the scheme, cavitation erosion and erosion integrated simulation can be achieved, the ultra-high-speed jet flow capacity is achieved, the jet flow sand content, the jet flow attack angle and the jet flow distance can be accurately controlled, and erosive wear experiments of multiple sets of samples can be achieved at the same time under the same jet flow condition.

The invention discloses a femtosecond time resolution multi-exposure imaging system and a femtosecond time resolution multi-exposure imaging method for observing gas nucleus evolution near a material plate, and belongs to the technical field of ultrafast optical diagnosis. A single pulse emitted by a femtosecond laser light source is subjected to passive beam splitting through a transparent medium sheet queue, and a femtosecond multi-pulse probe cluster is generated; the formation of a gas nucleus is induced near a material interface through a gas nucleus inducing device, and the time sequence of the multi-pulse probe cluster, the formation of the gas nucleus and the exposure of the photosensitive element is accurately controlled by utilizing a synchronous control module; after analysis of the data processing and analysis module, femtosecond-level dynamic information of the whole process of gas nuclei near the material from primary generation, evolution to collapse can be obtained. The ultra-high time resolution is achieved through a simple and low-cost system, an effective means is provided for fine diagnosis of the ultra-fast transient process in the gas nucleus and material interaction, and the method has important application value in the fields of cavitation erosion mechanism research, high-performance material testing, hydraulic machinery and the like.

The utility model discloses a water turbine set draft tube containing gas -solid coupling formula vortex belt suppression device, through setting up air supplementing pipeline and air inlet device, can when the unit appears unstable condition, supplement into air, destroy vortex belt, is used for reducing vibration, prevents cavitation erosion and reduces whirlpool intensity, sets up support piece, can fix air supplementing pipeline at the same time to the support effect of pipe wall, reduce the vibration of disadvantage factor, sets up the flow guide component, can destroy vortex belt stability when the water flow passes, prevents the damage of overflow part, through the mutual coupling of air supplementing and fixed flow guide component, support piece, guarantee the stable operation of unit to a great extent, compared with traditional single air supplementing mode, this scheme can further reduce the disadvantageous influence that vortex belt of draft tube produces to unit operation.