115 results about "Cavitation erosion" patented technology

The present invention discloses a method and device for numerical simulation of near-wall single cavitation collapse coupled with boundary motion, comprising: step 1, introducing a physical model of a near-wall single cavitation into a pre-constructed external flow field to obtain a corresponding flow field physical model; step 2, meshing the flow field physical model; setting initial conditions and flow field boundary conditions, and setting a time step that meets the calculation requirements; step 3, setting specific calculation parameters for solving the flow field process, and introducing a fluid volume method to capture the gas-liquid interface; step 4, applying wall vibration in the form of a user-defined function to simulate the cavitation dynamics behavior under vibration impact. The present invention takes into account the influence of wall vibration in the numerical simulation process by coupling boundary motion, and realizes the simulation of the dynamics behavior of near-wall single cavitation under vibration impact conditions. On this basis, the influence of conditions such as vibration frequency on the cavitation collapse process can be further explored, providing theoretical guidance for optimized cavitation suppression design.

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 invention discloses an elastic material hydrofoil fluid-solid coupling cavitation erosion forecasting method based on a potential energy theory, and belongs to the field of computational fluid mechanics and cavitation. The implementation method comprises the following steps: simulating the cavitation of the hydrofoil made of the elastic material by using a tight coupling algorithm to obtain the pressure and steam volume fraction distribution of the surface of the hydrofoil; a steam volume fraction distribution based on pressure; constructing an erosion index correction factor F for representing the bending torsional deformation degree of the elastic material hydrofoil to correct the cavitation erosion index represented by the pressure wave power density; the cavitation erosion indexes larger than a threshold value are screened out, and the final cavitation erosion risk index is a quotient after superposition of the cavitation erosion indexes; the corrected cavitation erosion index data are interpolated into RGB color data, the data serve as a geometric structure model of a fourth-dimensional mapping elastic material hydrofoil, and the corrected cavitation erosion index numerical value is represented through color change. The corrected cavitation erosion index can more accurately forecast a cavitation erosion risk part on the surface of the hydrofoil made of the elastic material.

The invention belongs to the technical field of anti-freezing solutions, particularly relates to an anti-freezing cooling liquid and a preparation method and application thereof, and provides an all-organic heat transfer system anti-freezing cooling liquid which contains efficient all-organic adsorption acid and an anti-corrosion inhibition additive, has better anti-corrosion and anti-rust capabilities on various metals, and has a good anti-freezing effect. And the anti-corrosion agent has excellent anti-rust function for soldering tin, cast aluminum, cast iron, steel, brass, red copper and the like, especially the anti-corrosion performance of a wet cylinder sleeve of a heavy-duty vehicle. The lubricating oil has excellent cavitation erosion resistance and pitting corrosion resistance, and has an excellent protection effect on an engine cooling system. The anti-freezing cooling liquid product is free of precipitates, stable in performance, safe, non-toxic, green and environment-friendly.

A low-temperature pipeline cavitation and cavitation erosion experiment table disclosed by the present invention comprises a liquid supply tank, a venturi tube assembly and a receiving tank, the venturi tube assembly comprises a venturi tube, a test piece mounting seat and a plurality of sensors, one end of the venturi tube assembly is communicated with the liquid supply tank, the other end of the venturi tube assembly is communicated with the receiving tank, and the cross section of a flow channel of the venturi tube is rectangular. An embedding groove and a plurality of sensor mounting grooves are formed in the flow channel wall of the venturi tube; the test-piece mounting seat is used for fixing a test-piece; the plurality of sensors comprise a vibration sensor, a temperature sensor and a pressure sensor, and the vibration sensor is arranged on the test piece mounting seat; the temperature sensor and the pressure sensor are respectively embedded in the corresponding sensor mounting grooves; by adopting the design of the venturi tube with the rectangular section, the space adaptability and the experiment controllability are remarkably improved. The test piece and various sensors are arranged along the venturi tube, so that the accurate association between the material cavitation damage and the multi-physical field signal is realized, the cavitation collapse transient process is accurately captured, and the reliability of experimental data is guaranteed.

The present invention discloses a long-lasting anti-corrosion multilayer coating on the surface of a turbine blade and a preparation method thereof, specifically comprising: preparing powder particles for spraying, preparing an anti-erosion coating and a composite anti-cavitation coating by HVOF, and alternately spraying to obtain the long-lasting anti-corrosion multilayer coating; the multilayer coating is composed of an anti-erosion coating and an anti-cavitation coating alternately sprayed on a blade substrate, and the anti-cavitation coating and the anti-erosion coating are alternately exposed and have appropriate layer thicknesses to specifically resist cavitation damage in non-flood seasons and erosion damage in flood seasons, reduce the overall abrasion rate of the coating, and extend the service life of the blade. At the same time, the service life of the blade is regulated by changing the number of layers of the anti-erosion coating and the anti-cavitation coating, which is also helpful to predict the overhaul cycle of the turbine and reduce the exploration workload. It has important application prospects in the field of surface protection of hydraulic machinery.

A valve member (25, 125) for a fuel injector control valve comprising a unitary metal body with a threaded bore therethrough concentric with a cylindrical outer surface (42); wherein the cylindrical outer surface (42) has a composite ring (26); wherein a portion of the composite ring (26) is defined by an annular valve surface (43); wherein the composite ring (26) is located in a small diameter segment (46) of the cylindrical outer surface (42); wherein an additional ring is defined by a large diameter segment (47) of the cylindrical outer surface (42); wherein the composite ring (26) has a small ring (45) which opens into a large ring (44); wherein a center of the small ring (45) is offset with respect to a center of the large ring (44); and wherein the small ring (45) has a U-shaped cross-section.

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 invention belongs to the technical field of material performance evaluation, and provides a metal material cavitation erosion incubation period prediction method based on surface plastic deformation analysis. The method comprises the following steps: carrying out cavitation erosion test on a sample; measuring the surface profile length of the sample in the cavitation environment, and calculating the surface area increment rate of the sample; drawing a surface area increment rate-time change curve, and obtaining an incubation period demarcation point and an incubation period end point of the sample; predicting the incubation period of the actual equipment according to the incubation period demarcation point and the incubation period end point; by analyzing the surface area increment rate of the material exposed in the cavitation environment, the incubation period is divided into two stages dominated by hardness and strain hardening indexes, a quantitative relation with the material performance is established, and non-destructive life prediction is achieved.

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 cavitation and cavitation erosion integrated generation device for a hydraulic element. The cavitation and cavitation erosion integrated generation device comprises a core observation test block and a replaceable cavitation core part, the core observation test block is of a cuboid structure made of a transparent material; a functional oil duct, a low-pressure oil duct, a high-pressure oil duct and a sensor oil duct are arranged in the core observation test block; a piston cylinder and a piece-containing anti-rotation piston are symmetrically arranged on the left side and the right side of the core observation test block; the part-containing anti-rotation piston is mounted in the piston cylinder in a sealing manner; the replaceable cavitation core part is made of transparent materials, one end of the replaceable cavitation core part is fixedly connected with the part-containing anti-rotation piston, and the other end of the replaceable cavitation core part extends into the functional oil duct. And a cavitation channel for communicating the high-pressure oil channel with the low-pressure oil channel is formed between the two replaceable cavitation core pieces. The device is high in replaceability or interchangeability, controllable in pressure flow and controllable in structure position, and can integrally meet the requirements of visual cavitation and cavitation erosion generation.

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.

According to the hydroelectric generating device capable of directly driving the generator to do work through potential energy change, the mode of a conventional water turbine power generation system is thoroughly changed, a water turbine is not needed, the hydroelectric generating device capable of directly driving the generator to do work through potential energy change is achieved, the rectangular barrel can be filled with water, and therefore a high-pressure water supporting bucket water column is formed; potential energy change of the water column can drive the generator to do work; only potential energy changes in the whole operation process, so that the power generation process is low in noise and free of waterfall, and the problem of underwater replacement of the water turbine due to abrasion and cavitation erosion is solved; the bottom of the dam does not need to be provided with holes, so that the dam is high in strength, and about 20% of reinforced concrete can be saved; as the rectangular barrel and the water supporting bucket directly reach the bottom of the dam, energy is utilized completely, and the utilization rate or the generating capacity is about 33% higher than that of a conventional water turbine; a stator of the generator adopts copper-clad iron enameled wires, and coils are arranged in a crossed manner and are mutually laminated, so that the copper-clad iron coils in the generator not only can generate a magnetic field, but also can play a role in enhancing the magnetic field intensity like an iron core.

The invention provides an engine control method and device for preventing cavitation erosion of an air cylinder sleeve, a medium and a product, and relates to the technical field of engine control, and the method comprises the steps that the cooling water pressure value of a data collection point close to one side of the air cylinder sleeve in a cooling water cavity is obtained, the cooling water pressure value of the data acquisition point is in negative correlation with the vibration speed of the cylinder sleeve; whether the cavitation erosion risk exists in the cylinder sleeve is identified based on the cooling water pressure value; if yes, the flow of cooling water flowing through the cooling water cavity is adjusted, so that the pressure value of the cooling water is increased, and adjustment is stopped until the pressure value of the cooling water is larger than the preset saturated vapor pressure of the cooling water; if not, first information used for representing that the cavitation erosion risk does not exist in the cylinder sleeve is sent out. According to the method, the cavitation erosion risk of the cylinder sleeve can be effectively evaluated in real time, corresponding response is quickly made, the method has the remarkable advantages of quick response and high-precision response, the comprehensive durability of the cylinder sleeve can be remarkably improved, and the service life of the cylinder sleeve can be remarkably prolonged.

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.

The application discloses a cutter microstructure processing device and method using valve port fluid cavitation erosion effect. The device comprises a valve body module, a temperature control module, a micro-particle adding assembly and a cutter clamping assembly. The valve body module comprises a valve sleeve and a valve core. The valve core is installed in the inner cavity of the valve sleeve. The inner side wall of the valve sleeve and the outer side surface of the valve core form a cavitation processing flow channel with annular longitudinal section. The cavitation processing flow channel comprises an input flow channel, a throttle port and an output flow channel connected in sequence along the liquid medium flow direction. The temperature control module comprises a temperature sensor and a nested liquid cooling assembly, and the nested liquid cooling assembly comprises a liquid cooling cover sleeved outside the valve body module. The inner side surface of the liquid cooling cover and the outer side surface of the valve sleeve form a heat exchange flow channel. The application utilizes the cavitation effect formed after the fluid medium mixed with micro-particles passes through the throttle port to erode the rake face of the processed cutter, so that the microstructure capable of improving the cutting performance of the processed cutter is rapidly processed on the rake face.

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 application relates to a method, apparatus, and computer equipment for rapid determination of cavitation damage in a turbine runner. The method includes: acquiring point cloud data collected by a 3D laser scanner on the surface of the turbine runner; determining the cavitation erosion region based on the geometric features of the point cloud data; determining the cavitation damage area, cavitation damage depth, and cavitation damage volume based on the point cloud data corresponding to the cavitation erosion region; and determining the cavitation damage measurement result of the turbine runner based on the cavitation erosion region, cavitation damage area, cavitation damage depth, and cavitation damage volume. This method leverages the high precision and anti-interference characteristics of the 3D laser scanner to identify cavitation erosion areas using the collected point cloud data, calculate the area, depth, and volume of the cavitation erosion region, and generate accurate cavitation damage measurement results for the turbine runner. This avoids the limitations imposed by the detection environment and operating conditions on cavitation damage detection, achieving efficient cavitation damage detection and thus improving the safety of hydroelectric equipment.

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 invention discloses an experimental device and method for simulating single-cavitation erosion in a controllable temperature field, and relates to the field of cavitation dynamics and cavitation erosion. The problem that in the prior art, comprehensive and fine observation and quantitative analysis are carried out on the wall face erosion phenomenon induced by the single cavitation bubble under the controllable temperature condition is solved. The experimental device mainly comprises a heating system used for regulating and controlling the temperature of fluid, a temperature control system, an electric spark discharge device used for generating a single cavitation bubble in the target temperature fluid, a high-speed photography system used for capturing the dynamic behavior of the cavitation bubble, and a microscopic system used for observing and analyzing wall surface damage. The experimental method comprises the following steps: establishing and maintaining a uniform and stable preset target temperature field in a working fluid through a heating and temperature control system, accurately inducing a single cavitation bubble, capturing a dynamic process by using a high-speed photography system, and carrying out quantitative analysis on erosion morphology through a microscopic system. The method is also suitable for the practical engineering application fields of material protection, cavitation effect regulation and control and the like under high-temperature or variable-temperature working conditions.

The application provides a start-stop method of a supercritical carbon dioxide cycle system, and belongs to the technical field of power generation. The method comprises the following steps: the shutdown process of an S-CO2 Brayton cycle power generation system is mainly divided into three stages: the first stage is the process of reducing the system load from 100% to 10%, the load reduction of the system is realized by using valve storage coupling control, and the thermal efficiency of the system is maintained at a high value in a wide load range; the second stage is the process of reducing the system load from 10% to 0, the process is realized by reducing the inlet temperature of the turbine, so that the circulation flow can be ensured not to be reduced during the load reduction process, and the possible pipe explosion accident of the boiler during low load operation can be avoided; the third stage is the process of stopping each device, and the potential over-temperature pipe explosion risk of the gas cooling wall when the working medium flow in the boiler is too low and the cavitation erosion risk of the compressor when the minimum circulation pressure is lower than the critical pressure are considered. The method can ensure the safety and rapidity during the start-stop process of the system.

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.